Senior Full-Stack Engineer (Kotlin & TS)

🏢 Summary: Contract B2B role for a senior engineer to rebuild a 401(k) retirement plan administration platform from scratch with an AI-native foundation, owning end-to-end delivery across AWS infrastructure, JVM backend, and TypeScript frontend. The position involves architectural decision-making, close collaboration with US-based stakeholders, and translating complex financial domain rules into scalable software. Strong emphasis on AI-assisted engineering practices and greenfield system design in a regulated, transactional environment. 🗂️ Requirements: 7+ years professional software engineering experience, Senior or staff-level system design experience, Strong JVM backend experience (Kotlin, Java, or Scala), Solid TypeScript frontend experience (React, Angular, or similar), Production experience with AWS, Deep understanding of VPCs, IAM, RDS, Lambda or ECS, Experience with Infrastructure as Code (Pulumi, Terraform, or CDK), Experience designing non-trivial distributed systems, Fluent English, Experience in regulated or transactional domains, Ability to work with US East Coast time overlap 📃 Skills: Kotlin, Java, Scala, TypeScript, React, Angular, AWS, VPC, IAM, RDS, Lambda, ECS, Pulumi, Terraform, CDK, Claude, Cursor, CI/CD, Python 🏢 Description: Vecten | Client: US-based, retirement plan administration | Remote (Poland-based) | Contract / B2B We are an AI-native data and technology partner for private capital and healthcare. Founded in 2010 and headquartered in Warsaw, we work with leading PE firms, VC funds, and healthcare organizations to build proprietary data infrastructure, deploy AI solutions, and drive AI-native transformation. Our clients manage a cumulative $210B+ in assets. Our average engagement runs five years. Our NPS sits above 80. We don't need to claim credibility — we can show it. We've also done to ourselves what we now do for clients. We've restructured our own company around AI — tools, policies, roles, delivery models. This isn't a pitch. It's a playbook we've already run, and we're hiring the engineers who will run it for others. - Financial Platform Rebuild - You'd be joining a small, senior team rebuilding a 401(k) plan administration platform from the ground up. The existing system was built and operated by a third party; the client is taking ownership and rebuilding it greenfield with a strong AI-native foundation. This is not a ticket-taking role. You'll sit in product conversations with business users, push back on requirements, propose architectural directions, and own end-to-end delivery from infrastructure to UI. The client is US-based with engineers on both coasts. Working hours need meaningful overlap with US East Coast (afternoon CET works well). What you'd be doing Designing and building the core platform: event processing for money math, plan configuration, eligibility rules, and the supporting services around them. Owning vertical slices end-to-end – AWS infrastructure, Kotlin backend, TypeScript frontend. Acting as a thought partner on architecture decisions still being made (IaC choice, service boundaries, data model). Interviewing internal subject-matter experts to translate domain knowledge into working software. Setting the bar for AI-native engineering practices – how the team uses Claude Code, Cursor, agents, and what good looks like. Logistics Engagement model: Contract via Vecten (B2B), initial 3–6 month commitment with strong likelihood of extension. Hardware: Vecten provides a managed, secured environment. Interview process: Vecten internal screen → tech screen with the client's tech lead → live coding session (likely screen-share, AI-assisted format) → culture call. Start: Ideally within 2–4 weeks. Must-have 7+ years of professional software engineering experience , with a meaningful track record of senior or staff-level work. Strong backend engineering on the JVM – Kotlin, Java, or Scala in production. Kotlin experience preferred; if you have strong Java/Scala and have shipped Kotlin on a side project, that works. Solid TypeScript on the frontend – React, Angular, or similar, enough to own UI slices without needing a dedicated frontend pair. Solid cloud infrastructure fundamentals – you've reasoned about networking, IAM, compute, and managed services for real systems and can defend the trade-offs. Architecture chops – you've designed non-trivial systems, can defend trade-offs, and are comfortable disagreeing when you think someone's wrong. English fluency – you'll be talking to business users and engineers daily. Strongly preferred AI-native fluency – you actively use Claude Code, Cursor, or equivalent agents in your daily workflow. You can talk specifically about what you delegate, what you don't, and why. AWS in production – not just "deployed something once". Deep familiarity with VPCs, IAM, RDS, Lambda/ECS trade-offs on real workloads. IaC experience – Pulumi, Terraform, or CDK. Background in regulated or transactional domains – fintech, payments, healthcare, insurance, ERP, billing systems. Anything where audit trails, eligibility rules, and money math matter. Comfort working in greenfield ambiguity – you've been the second or third engineer on a platform before and know how to make progress when half the decisions aren't made yet. Nice to have Direct retirement / pensions / 401(k) experience – the unicorn profile. If you have it, lead with it. DevOps depth – you've owned CI/CD pipelines, observability stacks, and on-call rotations. Python data-stack background – likely to become relevant as analytics and reporting work comes online. What we're not asking for A specific number of years on Kotlin, AWS, or any one tool. We care about depth of judgment, not box-ticking. Front-end specialisation. You don't need to debate React Server Components – you need to ship working UI. Big-bank or HFT pedigree. This is retirement plan administration, not trading. Benefits Unrestricted AI Stack & Premium Gear: Fully paid licenses for Cursor, Claude Pro, etc. Work with a talented team redefining the global perception of Poland Flexible working hours and remote work options Comfortable office in central Warsaw with all essential tools Multisport card & private medical care A culture of feedback – evaluation meetings, mentoring, and career growth opportunities Frontier Engineering Culture: Build alongside elite engineers who are shipping systems that drive real investment decisions. Backed by continuous growth and a strong knowledge-sharing culture ( check our YouTube ). Sounds like a perfect place for you? Don’t hesitate to click apply and submit your application today!

🏢 Summary: Fullstack Data & AI Engineer role focused on building and maintaining end-to-end applications using .NET/C# and Angular, while designing data pipelines and integrating AI/LLM features. The position combines full-stack development with cloud data warehouse work and ETL processes to deliver scalable, AI-powered solutions. Responsibilities include performance optimization, Azure-based deployments, and technical support. 🗂️ Requirements: Bachelor’s degree in Computer Science, Information Systems, or related field, Minimum 6 years of .NET/C# and T-SQL full-stack development experience, Strong experience with ASP.NET, Angular, REST, Entity Framework, Hands-on experience with SQL Server and T-SQL, Experience with cloud data warehouses (Redshift, BigQuery, Snowflake, or Azure Synapse), Experience designing and maintaining ETL/ELT data pipelines, Practical experience integrating LLMs and AI tools, Minimum 2 years of experience with Azure-hosted applications, Understanding of secure coding practices, Experience with Azure DevOps 📃 Skills: C#, .NET, ASP.NET, Angular, T-SQL, SQL, SQLServer, EntityFramework, REST, JavaScript, Azure, Redshift, BigQuery, Snowflake, AzureSynapse, ETL, ELT, LLM, AI, AzureDevOps, MessageQueues 🏢 Description: Vecten is an AI-native data and technology partner for private equity, venture capital, and healthcare. We build proprietary data infrastructure, deploy AI solutions, and own the outcomes — not just the code. Our clients manage a cumulative $210B+ in assets and stay with us for an average of five years. We've reorganized our own company around AI, and we do the same for the firms that trust us with their most critical decisions. The project: The primary role of the Fullstack Data & AI Engineer is to build and maintain software applications using .NET/C# and Angular, while also designing and supporting data pipelines and AI-powered features. The person will create applications from scratch as well as modify existing ones, including configuration, testing, and deployment. Beyond application development, you will work with cloud data warehouses, ETL processes, and LLM integrations to deliver end-to-end solutions. You will also provide application support and mentor junior team members. On a daily basis, you will write and debug code, work with large datasets, and collaborate with software engineers, QA analysts, product managers, business analysts, and production support engineers to build software solutions that meet client business needs. The role: Write clean, scalable, and secure code using T-SQL and .NET/C# for applications hosted on-prem and in Azure Develop front-end and back-end components using Angular, .NET Core, C#, T-SQL, JavaScript, Message Queues, and related technologies Design, implement, and maintain data pipelines and ETL/ELT processes, including ingestion, transformation, and loading into cloud data warehouses such as Redshift or BigQuery Build and maintain efficient database schemas, stored procedures, and queries using SQL Server; optimize queries and application code for performance and stability Integrate LLM-based features and AI tools into applications and development workflows Revise, update, refactor, and debug code to troubleshoot errors and improve quality Follow Agile methodology and participate in team ceremonies (Standup, Retro, Planning, Refinement, etc.) Participate in requirements analysis and refinement, updating requirements as needed Produce and execute unit tests Participate in code reviews and both provide and incorporate feedback Collaborate with internal teams to produce and document scalable software design and architecture Contribute to improving development processes, engineering tools, code quality, automation, and the SDLC Serve as a technical expert on applications and provide Level 2/3 support via Helpdesk tickets as needed What's important for us? Bachelor's degree in Computer Science, Information Systems, or a related field, or equivalent experience At least 6 years of .NET/C# and T-SQL full-stack development experience, including C#, ASP.NET , SQL Server (T-SQL), REST, Angular, and Entity Framework Hands-on experience with cloud data warehouses such as Redshift, BigQuery, Snowflake, or Azure Synapse, including designing schemas, writing complex queries, and managing large datasets Practical experience building and maintaining data pipelines and ETL/ELT processes AI-forward mindset with practical experience using LLMs and AI tools to improve development workflows and application capabilities 2+ years of experience developing and supporting applications hosted in Azure Good understanding of secure coding guidelines and the ability to apply them in practice Experience working with Healthcare EDI transactions is a plus; 1-2 years of Healthcare or Insurance industry experience is a plus Strong analytical, critical thinking, and problem-solving skills, combined with solid interpersonal and communication skills High attention to detail; able to organize and prioritize work while maintaining accuracy Ability to work independently and follow through on assignments with minimal direction Working knowledge of Azure DevOps or ability to learn it quickly What do we offer? Culture of teamwork, professional development, and knowledge sharing ( https://www.youtube.com/user/sunscraperscom ) Flexible working hours and remote work possibility Multisport card Private medical care Culture of good feedback: code reviews, evaluation meetings, mentoring. Comfortable office in central Warsaw equipped with all the necessary tools for comfortable work (Macbook Pro, external screen, ergonomic chairs) - if working on-site

🏢 Summary: Senior DevOps/Cloud Engineer role focused on designing and operating cloud infrastructure and data platforms for a Forbes 500 private equity client. The position involves owning AWS-based environments, Infrastructure-as-Code, Kubernetes workloads, identity and authentication systems, and production reliability. You will support data engineering teams by building secure, scalable, and observable multi-cloud infrastructure. 🗂️ Requirements: 10+ years in IT, 5+ years in DevOps/Cloud role, Deep AWS expertise (IAM, EC2, S3, EKS), Strong Terraform experience with end-to-end IaC ownership, Hands-on Kubernetes setup and operations, Docker proficiency, Strong Python skills, Strong Bash skills, Experience with IAM and identity providers, Knowledge of OAuth/OIDC and SSO, Experience with Entra ID and Active Directory, Observability and SRE practices experience, Experience with relational and NoSQL databases, C1+ English proficiency 📃 Skills: AWS, Azure, Terraform, Python, Bash, SQL, Docker, Kubernetes, Airflow, Snowflake, Redshift, Athena, GitLab, Artifactory, SQLAlchemy, IAM, OAuth, OIDC, SSO, Okta, ActiveDirectory, EC2, S3, EKS, Lambda, RDS, Route53, EntraID, CI/CD, Scrum 🏢 Description: We are an AI-native data and technology partner for private capital and healthcare. Founded in 2010 and headquartered in Warsaw, we work with leading PE firms, VC funds, and healthcare organizations to build proprietary data infrastructure, deploy AI solutions, and drive AI-native transformation. Our clients manage a cumulative $210B+ in assets. Our average engagement runs five years. Our NPS sits above 80. We don't need to claim credibility — we can show it. We've also done to ourselves what we now do for clients. We've restructured our own company around AI — tools, policies, roles, delivery models. This isn't a pitch. It's a playbook we've already run, and we're hiring the engineers who will run it for others. The Project: We are carrying out the project for our client, an American private equity and investment management fund - listed on the Forbes 500 list - based in New York. We support them in the area of data pipeline, infrastructure and data engineering team. They operate very widely in the world of finance, loans, investments and real estate. Tech stack AWS (EC2, ELB, IAM, Lambda, RDS, Route53, S3, Athena, Redshift, EKS), Azure (Entra ID / Copilot integration), Terraform, Python, Bash, SQL, Docker, Kubernetes, Apache Airflow, Snowflake, GitLab, Artifactory, SQLAlchemy. Best practices: CI/CD, Code Reviews, Scrum. Your responsibilities Designing, building and maintaining cloud infrastructure across AWS environments, with Azure involvement where needed for Copilot integration Writing and owning Infrastructure-as-Code (Terraform) — from greenfield builds to ongoing refactors Running containerized workloads (Docker, Kubernetes) across multi-region setups Owning observability: logging, metrics, dashboards, reliability targets, operational runbooks Engineering identity and auth solutions — IAM policies, Entra ID, OAuth/OIDC, SSO, Okta, token ownership, service vs. user auth, cross-platform access Debugging real production issues: API failures, auth loops, rate limits, model config problems, client SDK bugs, capacity constraints Building reusable tooling and infrastructure for data scientists and engineers Supporting the broader data engineering team with DevOps expertise Documenting what you build — clearly and thoroughly What we're looking for 10+ years in IT, including 5+ years in a DevOps/Cloud role Deep AWS expertise (IAM, EC2, S3, EKS and beyond); Azure awareness for Copilot-adjacent work Solid Terraform background — you've owned IaC end-to-end, not just contributed to it Kubernetes experience: setting it up from scratch, scaling, day-2 operations Docker proficiency Strong Python and Bash skills Identity and auth engineering: IAM, Entra ID, OAuth/OIDC, SSO, Okta, Active Directory Observability and SRE mindset — you write runbooks, you own reliability, you don't just monitor Experience with relational and NoSQL databases C1+ English — written and spoken Nice to have Experience with data pipeline tools (Airflow, Snowflake, Redshift, Athena) Familiarity with Artifactory or similar repository managers Experience in secure/corporate networking environments (proxies, firewalls) Python data stack: Pandas, NumPy, SQLAlchemy; basic ML libraries a plus Comfort working in both Windows and Unix environments Benefits Unrestricted AI Stack & Premium Gear: Fully paid licenses for Cursor, Claude Pro, etc. Work with a talented team redefining the global perception of Poland Flexible working hours and remote work options Comfortable office in central Warsaw with all essential tools Multisport card & private medical care A culture of feedback – evaluation meetings, mentoring, and career growth opportunities Frontier Engineering Culture: Build alongside elite engineers who are shipping systems that drive real investment decisions. Backed by continuous growth and a strong knowledge-sharing culture ( check our YouTube ). Sounds like a perfect place for you? Don’t hesitate to click apply and submit your application today!

🏢 Summary: Senior or Staff Backend Engineer role focused on architecting and scaling AI-native backend services for a modern accounting platform. The position involves designing distributed systems, building secure and high-performance APIs, and establishing engineering standards to support rapid, reliable product delivery. You will work closely with Product, AI, and Operations teams to build scalable data pipelines and incident response infrastructure. 🗂️ Requirements: 5–10+ years of backend engineering experience, Proven experience designing and operating production backend systems at scale, Strong expertise in API design and data modelling, Deep understanding of distributed systems and architectural trade-offs, Hands-on experience with AWS or GCP in production environments, Practical experience with CI/CD pipelines and automated testing, Experience building and maintaining observability and on-call practices 📃 Skills: TypeScript, Node.js, React, AWS, GCP, Terraform, PostgreSQL, OpenAI, Azure, CI/CD, APIs, DistributedSystems, DataModelling, Observability 🏢 Description: ABOUT THE COMPANY We're an applied AI company building an AI-native alternative to legacy accounting software — a market worth tens of billions in annual recurring revenue. Our mission is to help entrepreneurs focus on what matters in their business and life, and to help their accountants become more strategic. We've raised $20M from a group of top-tier investors and have grown ARR 60% month-on-month since our public launch. We now serve thousands of businesses and are expanding our product to serve accountants directly — creating a two-sided platform where both business owners and their accountants use and recommend us. We're at an early but proven stage, moving fast, and building a world-class engineering team in Wrocław to match our ambition. ABOUT THE ROLE We're looking for a Senior or Staff Backend Engineer to own and evolve our backend services as we scale. This is a broad, high-impact role — you'll architect new features, build the systems that underpin our core product, and set the engineering standards that shape how the whole team works. The focus is on building a modern, AI-native developer experience. That means working closely with Product, AI, and Operations teams to design agentic systems, distributed data pipelines, and scalable incident response infrastructure — and doing it in a way that lets the team ship with confidence multiple times a day. WHAT YOU'LL WORK ON Architecture and feature design Partner with Product, AI, and Operations teams to architect new features and complex agentic systems. Make clear architectural trade-offs that balance platform, product, and business goals. Backend services and APIs Build and maintain the backend services and APIs that power the core product. Ensure systems are secure, well-tested, and high performance. Distributed systems Design and implement distributed services to orchestrate data pipelines, automate investigations, and enable incident response at scale. Operational excellence Own operational best practices so the team can ship multiple times a day with confidence. Healthy on-call culture and strong observability are part of what you'll build and maintain. Engineering standards Set the bar for writing, communication, and system design across the team. Your influence will shape how a modern AI-native product is built. WHAT WE LOOK FOR 5–10+ years of backend engineering experience A strong track record designing, building, and operating production backend systems at scale. Deep backend fundamentals Expertise in API design, data modelling, and reasoning about distributed systems trade-offs. You understand the nuances, not just the patterns. AWS or GCP hands-on experience Solid understanding of how infrastructure decisions impact application reliability and performance. You've run things in production, not just designed them. CI/CD in practice Practical experience with testing and deployment strategies in high-frequency shipping environments. Observability and on-call maturity A solid grasp of what good observability looks like and how to build healthy on-call practices that don't burn people out. Bonus Experience at an early-stage or scaling startup. Exposure to modern AI and ML systems. Experience shipping product without a dedicated product manager. TECH STACK TypeScript, React, Node.js, AWS, Terraform, PostgreSQL, OpenAI, Azure AI. The team uses GitHub, Slack, Linear, Figma, and Notion day to day. THE TEAM Small, senior, and in-person. The office is in central Wrocław, next to the main train station. The expectation is 4–5 days a week in the office — this is a deliberate choice, not a compromise. Relocation support is available for the right candidate. COMPENSATION & BENEFITS Salary $130,000 – $190,000 USD depending on experience, plus competitive equity. Wellness and commute stipend $100 per month. Hardware Premium hardware provided — MacBook Pro and AirPods. Food Daily in-office lunch and dinner. Time off 20 PTO days plus 9 US public holidays. Relocation Support available for candidates relocating to Wrocław.

🏢 Summary: Senior or Staff Product Engineer role focused on building and shipping intuitive, high-performance end-to-end web product experiences in an AI-native accounting platform. The position involves owning full-stack feature delivery from UI to server-side logic, collaborating directly with leadership and design, and setting engineering best practices. The role requires strong frontend expertise, cloud infrastructure knowledge, and hands-on work with modern AI tooling. 🗂️ Requirements: 5+ years of full-stack product engineering experience, Proven experience building and shipping production web applications, Strong practical experience with React and TypeScript, Experience designing and working with AWS or GCP cloud infrastructure, Ability to design and implement scalable server-side logic, Experience delivering end-to-end features from frontend to backend, Ability to work on-site 4–5 days per week in Wrocław 📃 Skills: TypeScript, React, Node.js, AWS, GCP, Terraform, PostgreSQL, OpenAI, Azure, GitHub, Figma, LLM 🏢 Description: ABOUT THE COMPANY We're an applied AI company building an AI-native alternative to legacy accounting software — a market worth tens of billions in annual recurring revenue. Our mission is to help entrepreneurs focus on what matters in their business and life, and to help their accountants become more strategic. We've raised $20M from a group of top-tier investors and have grown ARR 60% month-on-month since our public launch. We now serve thousands of businesses and are expanding our product to serve accountants directly — creating a two-sided platform where both business owners and their accountants use and recommend us. We're at an early but proven stage, moving fast, and building a world-class engineering team in Wrocław to match our ambition. ABOUT THE ROLE We're looking for a Senior or Staff Product Engineer with a strong track record of building intuitive, performant end-to-end product experiences. The defining quality of this role is craft — you care deeply about how things feel to use, and you're energised by the opportunity to make software feel like magic because AI is doing real work behind the scenes. You'll work directly with the CEO, Operations, AI, and Design teams to scope and ship user-facing features. There's no product manager layer here — you'll engage directly with users, iterate quickly, and own the quality of what you deliver from UI through to server-side logic. WHAT YOU'LL WORK ON End-to-end feature delivery Work directly with the CEO, Operations, AI, and Design teams to scope and ship polished, scalable user-facing features with beautiful UI components and robust server-side logic. Engineering best practices Redefine what best-in-class software development looks like for the team. You'll set the standard, not follow it. Technology evaluation Continuously research and evaluate new technologies to improve the speed, scalability, and performance of the product. Bring recommendations and drive adoption. User-focused iteration Engage directly with users to understand how the product is being used, iterate quickly, and deliver experiences that feel genuinely polished — not just functional. WHAT WE LOOK FOR 5+ years of full-stack product engineering A strong track record building and shipping full-stack production web applications that real users depend on. Modern frontend fluency Deep practical experience with React and TypeScript. You write frontend code that is fast, accessible, and maintainable — and you have an eye for detail in UI. Cloud infrastructure experience Familiarity with AWS or GCP architecture and design patterns, and an understanding of how infrastructure choices affect product performance and reliability. Strong communication Clear written and verbal communication. You can articulate trade-offs, give and receive direct feedback, and work well without a lot of process around you. Bonus Experience as a founder or early founding team member. Familiarity with modern LLM tooling and AI-assisted development (Cursor, Claude Code, etc). Background in finance or accounting. TECH STACK TypeScript, React, Node.js, AWS, Terraform, PostgreSQL, OpenAI, Azure AI. The team uses GitHub, Slack, Linear, Figma, and Notion day to day. THE TEAM Small, senior, and in-person. The office is in central Wrocław, next to the main train station. The expectation is 4–5 days a week in the office — this is a deliberate choice, not a compromise. Relocation support is available for the right candidate. COMPENSATION & BENEFITS Salary $130,000 – $190,000 USD depending on experience, plus competitive equity. Wellness and commute stipend $100 per month. Hardware Premium hardware provided — MacBook Pro and AirPods. Food Daily in-office lunch and dinner. Time off 20 PTO days plus 9 US public holidays. Relocation Support available for candidates relocating to Wrocław.

🏢 Summary: Platform / DevOps Engineer role focused on designing and operating a multi-tenant, real-time conversational AI infrastructure across public and private clouds. The position owns Kubernetes-based production environments, CI/CD, observability, inference routing, and cost optimization with strict latency and compliance requirements. The engineer shapes scalable, reliable infrastructure powering enterprise-grade AI deployments. 🗂️ Requirements: Significant production experience with Kubernetes at scale, Experience with multi-tenant SaaS architecture and isolation strategies, Hands-on experience in public and private cloud environments, Strong database expertise including replication, indexing, partitioning, tuning, Proficiency in Infrastructure as Code, Deep understanding of networking including ingress, mTLS, service mesh, DNS, Experience building and maintaining CI/CD pipelines, Experience implementing observability and monitoring systems, Experience with compliance, secrets management, and PII handling, Fluent English (B2) and Polish (C1) 📃 Skills: Kubernetes, Docker, CI/CD, Terraform, Networking, mTLS, DNS, ServiceMesh, Databases, SQL, Replication, Indexing, Partitioning, Monitoring, Observability, Cloud, SIP, WebRTC, RTP, AI, ModelAPIs 🏢 Description: About Lekta AI Founded in 2016 in Kraków, Poland , Lekta AI is a technological company working with major European banking , insurance , and telco enterprises . The company was set up with an ambitious goal of providing the best customer service in the world . Lekta stands out from the crowd of conversational AI companies because we combine technological expertise with domain-specific knowledge from contact center industry veterans . Through the use of our proprietary conversational neurosymbolic engine and backend integrations , our systems are intent- and context-aware , handling over 1.5 million conversations every month . Today, with offices in Poland and Spain , Lekta is rapidly expanding its business division to scale operations internationally . About the role Lekta is hiring a Platform / DevOps Engineer to own the infrastructure that carries our platform end-to-end — runtime, IDE, and the layers beneath . You'll work across both public cloud and private cloud deployments , because the customers we serve span both. Infrastructure decisions in this domain land directly in product quality: sub-second latency , multi-tenant isolation , deterministic compliance , and inference cost at scale all live in your remit. The systems you design now will shape how Lekta scales for years to come . We are building the next generation of conversational AI — a platform where the creator's experience is itself AI-native . Think of what Lovable did for app-building, applied to conversational agents: a visual IDE , a copilot that helps the user shape, refine and evolve the agent, and a runtime engineered to deploy what gets built into enterprise production . What makes the engineering genuinely hard is the combination our agents have to deliver simultaneously: fluent (natural language, real conversation), fast (sub-second on live voice channels), and reliable (predictable behaviour under real customer pressure, every time). Most stacks force a choice between two of those at the cost of the third. We don't , and that constraint shapes almost every engineering problem we work on. AI is a power tool , and we treat it like one. Lekta engineers are encouraged — and equipped — to use AI deeply across their work: Claude Code , model APIs , copilot tooling . We invest in the accounts, tooling, and time it takes to get fluent with them. We don't measure people on lines committed ; we measure on what gets delivered and how well it holds up in production . We are not an agentic-workflow company . AI generates; the engineer directs and reviews. Every change going out under your name has been read, understood, and signed off by you . Responsibilities Design, run and evolve Lekta's multi-tenant production infrastructure on Kubernetes across public and private cloud environments Own the infrastructure for real-time conversational channels , where latency is part of the product spec Build the routing, fallback, and reliability layer for inference workloads across multiple model providers Run cost engineering for the platform — per-tenant attribution , budgets , and optimisation of inference and infrastructure spend Establish observability that lets on-call engineers reason about agent behaviour , not just request timing Own the CI/CD pipeline that protects production deploys, with quality and regression gates Establish the compliance baseline for regulated enterprise customers — secrets , PII handling , audit trails Qualities Significant production experience running Kubernetes at meaningful scale Multi-tenant SaaS architecture background, with a clear view on isolation and pooling trade-offs Hands-on experience operating across both public and private cloud environments Strong database skills — replication, indexing, partitioning, tuning IaC fluency and configuration-level networking depth ( ingress, mTLS, service mesh, DNS ) — debugged, not just read about Articulated view on when to use managed services and when to self-host , grounded in both Track record of shipping production work with AI in your daily loop , and reviewing what it produces Real-time audio infrastructure ( SIP / WebRTC / RTP ), inference cost optimisation , or banking / fintech compliance is a plus Fluent in English (B2) and Polish (C1) ; other languages are a plus Why join us Visible impact — your engineering decisions land in real customer experience , not in roadmap slides Real ownership — few layers between you and production, and close work with engineering leadership and founders AI-first workflow with company-paid tooling — Claude Code , model access , IDEs of your choice Flexible contract types ( B2B / Employment Contract ), work arrangements , and working hours Remote, hybrid or in-office — from a location of your choice Direct, low-bureaucracy, results-oriented culture ; no micromanagement Competitive salary , with an honest conversation about trajectory as Lekta scales

🏢 Summary: Senior or Staff Backend Engineer role focused on architecting and scaling AI-native backend systems for a modern accounting platform. The position involves designing distributed services, building high-performance APIs, and establishing engineering standards to support rapid, reliable product delivery. You will work closely with Product, AI, and Operations teams to develop agentic systems and scalable data pipelines. 🗂️ Requirements: 5–10+ years of backend engineering experience, Proven experience designing, building, and operating production backend systems at scale, Strong expertise in API design, Strong expertise in data modelling, Deep understanding of distributed systems trade-offs, Hands-on experience with AWS or GCP in production, Practical experience with CI/CD in high-frequency deployment environments, Experience implementing testing and deployment strategies, Strong knowledge of observability practices, Experience participating in on-call rotations 📃 Skills: TypeScript, Node.js, React, AWS, GCP, Terraform, PostgreSQL, OpenAI, Azure, CI/CD, APIs, DistributedSystems 🏢 Description: ABOUT THE ROLE We're looking for a Senior or Staff Backend Engineer to own and evolve our backend services as we scale. This is a broad, high-impact role — you'll architect new features, build the systems that underpin our core product, and set the engineering standards that shape how the whole team works. The focus is on building a modern, AI-native developer experience. That means working closely with Product, AI, and Operations teams to design agentic systems, distributed data pipelines, and scalable incident response infrastructure — and doing it in a way that lets the team ship with confidence multiple times a day. WHAT YOU'LL WORK ON Architecture and feature design Partner with Product, AI, and Operations teams to architect new features and complex agentic systems. Make clear architectural trade-offs that balance platform, product, and business goals. Backend services and APIs Build and maintain the backend services and APIs that power the core product. Ensure systems are secure, well-tested, and high performance. Distributed systems Design and implement distributed services to orchestrate data pipelines, automate investigations, and enable incident response at scale. Operational excellence Own operational best practices so the team can ship multiple times a day with confidence. Healthy on-call culture and strong observability are part of what you'll build and maintain. Engineering standards Set the bar for writing, communication, and system design across the team. Your influence will shape how a modern AI-native product is built. WHAT WE LOOK FOR 5–10+ years of backend engineering experience A strong track record designing, building, and operating production backend systems at scale. Deep backend fundamentals Expertise in API design, data modelling, and reasoning about distributed systems trade-offs. You understand the nuances, not just the patterns. AWS or GCP hands-on experience Solid understanding of how infrastructure decisions impact application reliability and performance. You've run things in production, not just designed them. CI/CD in practice Practical experience with testing and deployment strategies in high-frequency shipping environments. Observability and on-call maturity A solid grasp of what good observability looks like and how to build healthy on-call practices that don't burn people out. Bonus Experience at an early-stage or scaling startup. Exposure to modern AI and ML systems. Experience shipping product without a dedicated product manager. TECH STACK TypeScript, React, Node.js, AWS, Terraform, PostgreSQL, OpenAI, Azure AI. The team uses GitHub, Slack, Linear, Figma, and Notion day to day. THE TEAM Small, senior, and in-person. The office is in central Wrocław, next to the main train station. The expectation is 4–5 days a week in the office. Relocation support is available for the right candidate. COMPENSATION & BENEFITS Salary $130,000 – $190,000 USD depending on experience, plus competitive equity. Wellness and commute stipend $100 per month. Hardware Premium hardware provided — MacBook Pro and AirPods. Food Daily in-office lunch and dinner. Time off 20 PTO days plus 9 US public holidays. Relocation Support available for candidates relocating to Wrocław.

🏢 Summary: Senior Staff Software Engineer role focused on designing and modernizing large-scale backend and frontend systems within a customer-facing platform. The position drives architectural transformation from monolith to modular services, strengthens CI/CD and DevOps practices, and embeds AI-powered engineering workflows across the SDLC. This is a hands-on, high-impact individual contributor role shaping technical direction and delivering production-grade systems at scale. 🗂️ Requirements: 12+ years of professional software engineering experience (backend and frontend), 5+ years leading complex, cross-team technical initiatives, Proven experience designing and shipping distributed systems at scale, Hands-on experience decomposing monoliths into service-oriented or modular architectures, Strong experience implementing CI/CD and DevOps practices, Hands-on experience with AI coding tools and integrating them into engineering workflows, Experience designing or building LLM-powered agents for engineering use cases, Familiarity with AI/agent frameworks, prompt engineering, and safe AI deployment, Ability to design architecture and contribute production-grade code across the stack, BS/MS/PhD in Computer Science, Engineering, or equivalent experience 📃 Skills: Java, Spring, Node.js, React, TypeScript, JavaScript, Kubernetes, Jenkins, Terraform, Git, GitHub, AI, LLM, Cursor, Claude, Agile, Scrum, Jira, Confluence 🏢 Description: Warsaw, Poland (hybrid) Our compensation structure is the base salary and equity in the form of restricted stock units. Total compensation: 65.000 – 80.000 PLN/month WHAT IS BOX? Box (NYSE:BOX) is the leader in Intelligent Content Management. Our platform enables organizations to fuel collaboration, manage the entire content lifecycle, secure critical content, and transform business workflows with enterprise AI. We help companies thrive in the new AI-first era of business. Founded in 2005, Box simplifies work for leading global organizations, including JLL, Morgan Stanley, and Nationwide. Box is headquartered in Redwood City, CA, with offices across the United States, Europe, and Asia. By joining Box, you will have the unique opportunity to continue driving our platform forward. Content powers how we work. It’s the billions of files and information flowing across teams, departments, and key business processes every single day: contracts, invoices, employee records, financials, product specs, marketing assets, and more. Our mission is to bring intelligence to the world of content management and empower our customers to completely transform workflows across their organizations. With the combination of AI and enterprise content, the opportunity has never been greater to transform how the world works together and at Box you will be on the front lines of this massive shift. We are an AI-first company. This means you approach your work with a growth mindset and find ways to leverage AI to help make faster, smarter decisions that will 10X your impact at Box. Why Box needs You We're looking for a Senior Staff Software Engineer to join our Core Experience organization, supporting both backend and frontend engineering across our Warsaw and Redwood City sites. This is a high-impact, hands-on senior individual contributor role for someone who wants to design complex systems and see them through to production in a customer-facing domain. You will help shape the technical direction of a large-scale, customer-facing platform - breaking out of our monolith, modernizing our backend and frontend architectures, and leading the organization toward strong continuous integration and DevOps practices. You will also champion AI adoption across the organization - enabling teams to use AI in their day-to-day engineering operations and building agents that accelerate the software development lifecycle (SDLC). You will ensure that systems are not only well-designed, but built, shipped, and operating reliably at scale. What You’ll do Build Critical Systems Own the architecture of key backend and frontend systems within Core Experiences. Lead the implementation of high-impact components end-to-end. Ensure systems are scalable, reliable, and observable from day one. Drive Execution at Scale Partner with engineering teams across Warsaw and Redwood City to turn architecture into working systems. Lead delivery of large, cross-team initiatives with measurable business impact. Balance speed, quality, and long-term maintainability in real-world tradeoffs. Set Technical Direction Establish patterns, frameworks, and standards that enable teams to move faster. Translate business priorities into clear technical roadmaps. Identify risks early and guide teams toward pragmatic solutions. Enable AI in Engineering Enable teams across Core Experiences to apply AI in their day-to-day engineering operations — coding, code review, testing, debugging, documentation, and incident response. Design and build agents that support the full software development lifecycle (SDLC), from design and implementation through code review, testing, deployment, and operations. Establish best practices, guardrails, and reusable patterns for safe and effective AI usage in engineering workflows. Evaluate and integrate AI tooling (e.g., Cursor, Claude Code, internal Box AI capabilities) into the team's standard development workflow. Measure and continuously improve developer productivity and code quality through AI-driven workflows. Influence & Mentor Collaborate across geographies and functions to align on architecture and execution. Mentor senior and staff engineers in system design, implementation, and effective use of AI in engineering. Contribute to a culture of strong ownership, quality, and continuous improvement. Ship Code Be hands-on in prototyping and contributing production-grade code across the stack. What You'll tackle in the first 6-12 months Lead the effort to break our backend and frontend out of the monolith into modern, modular, and maintainable architectures. Drive the organization's adoption of continuous integration and DevOps best practices, raising the bar for build, test, and deployment workflows. Roll out AI-assisted engineering practices across Core Experiences — enabling teams to use AI in their day-to-day work and embedding it into coding, review, and operational workflows. Design and ship agents that support the SDLC (e.g., code generation, automated review, test authoring, release readiness, on-call assistance) and demonstrate measurable productivity gains. Define how we build products going forward — including tooling, workflows, and architectural patterns shared across Warsaw and Redwood City. Set up frameworks for effective cross-site, cross-functional collaboration between backend and frontend engineers. Balance rapid delivery with long-term technical investments to ensure Core Experiences scales with enterprise-grade performance, security, and maintainability. Who You Are 12+ years of professional software engineering experience across backend and frontend. 5+ years leading complex, cross-team technical initiatives. Ability to operate at both high-level architecture and low-level execution. Proven track record of designing and shipping distributed systems at scale. Hands-on experience breaking monoliths into service-oriented or modular architectures. Strong experience driving continuous integration, CD, and DevOps practices across engineering organizations. Hands-on experience using AI coding tools (e.g., Cursor, Claude Code) and integrating them into team workflows; experience designing or building LLM-powered agents for engineering use cases is a strong plus. Familiarity with modern AI/agent frameworks, prompt engineering, evaluation, and safe deployment of AI in production engineering workflows. Experience aligning cross-functional and cross-site stakeholders around architecture decisions. Pragmatic decision-making: you balance ideal design with real-world constraints. Passionate about mentoring and building a strong engineering culture. BS/MS/PhD in Computer Science, Engineering, or equivalent experience. Comfortable working in a hybrid, globally distributed environment; able to travel to the U.S. at least twice a year for team off-sites. Other information Level positioning: Individual contributor, Director-equivalent Reporting line: Engineering Director, Core Experiences (Warsaw) Role location: Warsaw-based, partnering closely with Redwood City Core Experience Eng team locations: Poland and US (Warsaw and Redwood City) In-office requirements: 3 days per week, Tuesdays–Thursdays Methodology Frontend: React, TypeScript, modern JavaScript frameworks Backend: Java, Spring Boot, Node.js Version Control: Git, GitHub Enterprise Project Management: Agile/Scrum, Jira Knowledge Base: Confluence CI/CD & DevOps: Kubernetes, Jenkins, Terraform AI tools: Cursor, Claude Code, Box AI; agent frameworks for SDLC automation Box lives its values, with community and in-person collaboration being a core part of our culture. Boxers are expected to work from their assigned office a minimum of 3 days per week , with a focus on Tuesdays, Wednesdays and Thursdays. Your Recruiter will share more about how we work and company culture during the hiring process. EQUAL OPPORTUNITY We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, disability, and any other protected ground of discrimination under applicable human rights legislation. For details on how we protect your information when you apply, please see our Personnel Privacy Notice . For more details on how Box Poland protects your information, please see our Supplemental Personnel and Candidate Privacy Notice . #LI-EMEA #LI-PK1 #LI-HYBRID

🏢 Summary: Senior Staff Software Engineer role focused on designing and modernizing large-scale backend and frontend systems for a customer-facing platform. The position drives monolith decomposition, CI/CD and DevOps transformation, and adoption of AI-powered engineering practices, including building SDLC agents. It is a hands-on, high-impact individual contributor role shaping architecture and technical standards across distributed teams. 🗂️ Requirements: 12+ years software engineering experience (backend and frontend), 5+ years leading complex cross-team technical initiatives, Experience designing and shipping distributed systems at scale, Experience breaking monoliths into modular or service-oriented architectures, Strong experience with CI/CD and DevOps practices, Hands-on experience with AI coding tools and integrating them into workflows, Experience building or designing LLM-powered agents for engineering use cases, Knowledge of AI/agent frameworks and prompt engineering, Ability to design architecture and contribute production-grade code, Degree in Computer Science, Engineering or equivalent experience 📃 Skills: Java, Spring, Node.js, React, TypeScript, JavaScript, Kubernetes, Jenkins, Terraform, Git, GitHub, Agile, Scrum, Jira, Confluence, Cursor, Claude, AI, LLM 🏢 Description: Warsaw, Poland (hybrid) Our compensation structure is the base salary and equity in the form of restricted stock units. Total compensation: 65.000 – 80.000 PLN/month WHAT IS BOX? Box (NYSE:BOX) is the leader in Intelligent Content Management. Our platform enables organizations to fuel collaboration, manage the entire content lifecycle, secure critical content, and transform business workflows with enterprise AI. We help companies thrive in the new AI-first era of business. Founded in 2005, Box simplifies work for leading global organizations, including JLL, Morgan Stanley, and Nationwide. Box is headquartered in Redwood City, CA, with offices across the United States, Europe, and Asia. By joining Box, you will have the unique opportunity to continue driving our platform forward. Content powers how we work. It’s the billions of files and information flowing across teams, departments, and key business processes every single day: contracts, invoices, employee records, financials, product specs, marketing assets, and more. Our mission is to bring intelligence to the world of content management and empower our customers to completely transform workflows across their organizations. With the combination of AI and enterprise content, the opportunity has never been greater to transform how the world works together and at Box you will be on the front lines of this massive shift. We are an AI-first company. This means you approach your work with a growth mindset and find ways to leverage AI to help make faster, smarter decisions that will 10X your impact at Box. Why Box needs You We're looking for a Senior Staff Software Engineer to join our Core Experience organization, supporting both backend and frontend engineering across our Warsaw and Redwood City sites. This is a high-impact, hands-on senior individual contributor role for someone who wants to design complex systems and see them through to production in a customer-facing domain. You will help shape the technical direction of a large-scale, customer-facing platform - breaking out of our monolith, modernizing our backend and frontend architectures, and leading the organization toward strong continuous integration and DevOps practices. You will also champion AI adoption across the organization - enabling teams to use AI in their day-to-day engineering operations and building agents that accelerate the software development lifecycle (SDLC). You will ensure that systems are not only well-designed, but built, shipped, and operating reliably at scale. What You’ll do Build Critical Systems Own the architecture of key backend and frontend systems within Core Experiences. Lead the implementation of high-impact components end-to-end. Ensure systems are scalable, reliable, and observable from day one. Drive Execution at Scale Partner with engineering teams across Warsaw and Redwood City to turn architecture into working systems. Lead delivery of large, cross-team initiatives with measurable business impact. Balance speed, quality, and long-term maintainability in real-world tradeoffs. Set Technical Direction Establish patterns, frameworks, and standards that enable teams to move faster. Translate business priorities into clear technical roadmaps. Identify risks early and guide teams toward pragmatic solutions. Enable AI in Engineering Enable teams across Core Experiences to apply AI in their day-to-day engineering operations — coding, code review, testing, debugging, documentation, and incident response. Design and build agents that support the full software development lifecycle (SDLC), from design and implementation through code review, testing, deployment, and operations. Establish best practices, guardrails, and reusable patterns for safe and effective AI usage in engineering workflows. Evaluate and integrate AI tooling (e.g., Cursor, Claude Code, internal Box AI capabilities) into the team's standard development workflow. Measure and continuously improve developer productivity and code quality through AI-driven workflows. Influence & Mentor Collaborate across geographies and functions to align on architecture and execution. Mentor senior and staff engineers in system design, implementation, and effective use of AI in engineering. Contribute to a culture of strong ownership, quality, and continuous improvement. Ship Code Be hands-on in prototyping and contributing production-grade code across the stack. What You'll tackle in the first 6-12 months Lead the effort to break our backend and frontend out of the monolith into modern, modular, and maintainable architectures. Drive the organization's adoption of continuous integration and DevOps best practices, raising the bar for build, test, and deployment workflows. Roll out AI-assisted engineering practices across Core Experiences — enabling teams to use AI in their day-to-day work and embedding it into coding, review, and operational workflows. Design and ship agents that support the SDLC (e.g., code generation, automated review, test authoring, release readiness, on-call assistance) and demonstrate measurable productivity gains. Define how we build products going forward — including tooling, workflows, and architectural patterns shared across Warsaw and Redwood City. Set up frameworks for effective cross-site, cross-functional collaboration between backend and frontend engineers. Balance rapid delivery with long-term technical investments to ensure Core Experiences scales with enterprise-grade performance, security, and maintainability. Who You Are 12+ years of professional software engineering experience across backend and frontend. 5+ years leading complex, cross-team technical initiatives. Ability to operate at both high-level architecture and low-level execution. Proven track record of designing and shipping distributed systems at scale. Hands-on experience breaking monoliths into service-oriented or modular architectures. Strong experience driving continuous integration, CD, and DevOps practices across engineering organizations. Hands-on experience using AI coding tools (e.g., Cursor, Claude Code) and integrating them into team workflows; experience designing or building LLM-powered agents for engineering use cases is a strong plus. Familiarity with modern AI/agent frameworks, prompt engineering, evaluation, and safe deployment of AI in production engineering workflows. Experience aligning cross-functional and cross-site stakeholders around architecture decisions. Pragmatic decision-making: you balance ideal design with real-world constraints. Passionate about mentoring and building a strong engineering culture. BS/MS/PhD in Computer Science, Engineering, or equivalent experience. Comfortable working in a hybrid, globally distributed environment; able to travel to the U.S. at least twice a year for team off-sites. Other information Level positioning: Individual contributor, Director-equivalent Reporting line: Engineering Director, Core Experiences (Warsaw) Role location: Warsaw-based, partnering closely with Redwood City Core Experience Eng team locations: Poland and US (Warsaw and Redwood City) In-office requirements: 3 days per week, Tuesdays–Thursdays Methodology Frontend: React, TypeScript, modern JavaScript frameworks Backend: Java, Spring Boot, Node.js Version Control: Git, GitHub Enterprise Project Management: Agile/Scrum, Jira Knowledge Base: Confluence CI/CD & DevOps: Kubernetes, Jenkins, Terraform AI tools: Cursor, Claude Code, Box AI; agent frameworks for SDLC automation Box lives its values, with community and in-person collaboration being a core part of our culture. Boxers are expected to work from their assigned office a minimum of 3 days per week , with a focus on Tuesdays, Wednesdays and Thursdays. Your Recruiter will share more about how we work and company culture during the hiring process. EQUAL OPPORTUNITY We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, disability, and any other protected ground of discrimination under applicable human rights legislation. For details on how we protect your information when you apply, please see our Personnel Privacy Notice . For more details on how Box Poland protects your information, please see our Supplemental Personnel and Candidate Privacy Notice . #LI-EMEA #LI-PK1 #LI-HYBRID

🏢 Summary: Senior backend engineering role focused on building scalable AI infrastructure, APIs, and distributed systems powering LLM-based products. The position involves architecting retrieval, orchestration, streaming, and secure data processing pipelines for production-grade AI systems. Candidates are expected to work hands-on with Python backend technologies and AI integrations in a fast-changing startup environment. 🗂️ Requirements: 7+ years building production backend systems, 6+ years of Python experience, 3+ years of FastAPI experience, 2+ years of Redis experience, Experience with PostgreSQL and SQL, Experience delivering LLM systems, Knowledge of RAG, tool-calling, or AI agents, Experience with async and distributed workloads, Ability to design scalable APIs and services, Understanding of data security and isolation, Experience with integrations such as email or document stores, Ability to work in a changing startup environment 📃 Skills: Python, FastAPI, PostgreSQL, SQL, Redis, LLM, RAG, LangChain, LlamaIndex, APIs, Embeddings, Streaming, Tool-calling 🏢 Description: About us comm1t is a specialist IT recruitment agency delivering top engineers across Poland and Europe 🇪🇺. We combine experienced recruiters with autonomous AI agents and an obsessive focus on quality — sourcing 24/7 across LinkedIn, GitHub, and beyond to reach engineers who aren't actively job hunting but are open to the right move. We don't flood you with CVs. We get to know each candidate's skills, values, and goals, then send only the best-matched people — and we stay close through onboarding and the first months to make sure the placement lasts. About the role You'll lead the backend that drives the AI features — the APIs, the data pipelines, and the orchestration that connects the product to the language models doing the actual work. In practice that's querying across large document sets, getting trustworthy answers out of LLMs and their tool calls, pushing results to the UI as they stream, and grinding through lengthy background jobs without the whole thing toppling over. Forget CRUD. The real difficulty is making AI systems fast and reliable on confidential data, at production scale. The architecture choices land on you early, and you'll be the one living with them. What you'll do Architect and ship the APIs and services that everything else depends on Own the AI plumbing end to end: retrieval, orchestration, tool-calling, streaming, and the evals that tell you whether the results are worth anything Make async and distributed workloads rock-solid — document ingestion, embeddings, and long jobs running on Redis Wire up integrations with what clients already use (email, document stores) and harden them for real-world traffic Put data security and isolation front and center, because clients are handing over material they can't afford to leak Who you are Seven years or more delivering production backends — though how deep you go matters more to us than the figure itself You think in failure modes, not just the happy path You've shipped genuine LLM systems (RAG, tool-calling, agents), or you can't wait to — and you've got a feel for where they fall apart You lean on AI coding tools (Claude Code, Cursor, Copilot) and get real value from them: more speed, yes, but you grasp and back every line — code you'd reject in someone else's review is code you won't merge in your own A startup that keeps changing course doesn't faze you — plans get set, then torn up and redrawn Tech stack experience Python: 6+ years FastAPI: 3+ years PostgreSQL / SQL Redis: 2+ years Nice to have RAG or vector search experience LangChain or LlamaIndex