Full Stack Engineer - Policy Catalog

🏢 Summary: Senior Backend Engineer role focused on building and scaling backend microservices for consumer-facing platforms and internal data privacy systems. The position involves developing distributed, event-driven systems supporting personalization, search, and regulatory compliance at scale. It requires strong experience in JVM technologies and cloud-native environments. 🗂️ Requirements: Strong commercial experience with JVM-based languages (Java or Scala), Experience with Kotlin or willingness to learn, Solid understanding of microservices architecture, Experience with event-driven systems, Experience with Docker and Kubernetes, Hands-on CI/CD experience in production, Experience with unit and integration testing, Experience with relational databases and SQL, Ability to design and maintain scalable distributed systems 📃 Skills: Java, Scala, Kotlin, JVM, Microservices, Docker, Kubernetes, CI/CD, SQL, PostgreSQL, AWS, Terraform, Elasticsearch, MongoDB, GraphQL, Go, Python 🏢 Description: We are looking for a Senior Backend Engineer to join a fast-growing product organization working on consumer-facing platforms and internal data systems. This role is suited for an experienced backend engineer who is comfortable building scalable, reliable services across different domains, from customer-facing journeys to data privacy and compliance infrastructure. About the Project: You will contribute to backend systems that power core customer experiences and internal platform initiatives. Depending on the team, this includes scaling a menu and personalization platform for high-traffic consumer applications, or building a centralized Data Privacy Service handling regulatory compliance (GDPR, CCPA) and Data Subject Requests at scale. Both streams require strong engineering fundamentals, a microservices mindset, and the ability to deliver in complex, distributed environments. Responsibilities: Design, develop, and maintain scalable backend microservices across consumer or data platform domains; Build systems supporting search, personalization, customer targeting, and engagement; Develop and operate services ensuring regulatory compliance and secure data handling (GDPR, CCPA); Work with event-driven architectures and distributed systems; Contribute to CI/CD pipelines, testing practices, and overall engineering quality; Collaborate with product and engineering teams to deliver reliable and performant solutions. Qualifications: Strong commercial experience with JVM-based languages (Java, Scala, or similar); Experience with Kotlin, or willingness to learn it on the project; Solid understanding of microservices architecture and event-driven systems; Experience with Docker and Kubernetes; Hands-on CI/CD experience in a production environment; Experience with unit and integration testing; Familiarity with relational databases (e.g. PostgreSQL) and SQL; AWS and Terraform experience is a plus; Experience with Elasticsearch, MongoDB, or GraphQL is a plus; Go or Python knowledge is a nice to have; Background in e-commerce, subscription platforms, or data privacy systems is a plus. Recruitment Process: Initial interview with our recruitment team; Interview with the hiring manager; Live Coding Assessment; Meeting with the Project Manager. Inuits Sp. z o.o. is registered in the National Register of Employment Agencies (KRAZ) under number 35420.

🏢 Summary: Full-time contract role focused on migrating a legacy backend from Node.js (Nest.js) to a scalable, reactive Java/Spring Boot microservices architecture for a self-compliance enterprise platform. The position involves re-architecting services, implementing distributed systems patterns, and ensuring high availability, performance, and data integrity. Engagement is for 6+ months with a strict no-AI-tools policy and requires immediate availability. 🗂️ Requirements: Expert commercial experience with Java, Strong expertise in Spring Boot, Experience with microservices architecture, Practical knowledge of Netflix OSS, Hands-on experience with Spring Reactor, Strong experience with PostgreSQL, Experience with Redis, Proficiency with RabbitMQ, Experience with Liquibase, Experience with JUnit, Experience with Mockito, Availability to start ASAP or July 2026, Good English proficiency 📃 Skills: Java, Spring, SpringBoot, NetflixOSS, SpringReactor, PostgreSQL, Redis, RabbitMQ, Liquibase, JUnit, Mockito, Microservices, Reactive, SQL 🏢 Description: Join the engineering team to spearhead a critical backend migration from Node.js (Nest.js) to Java/Spring Boot for a specialized Self-Compliance platform. The platform enables enterprise companies to navigate, manage, and enforce labor laws alongside strict regulatory compliance frameworks. In this role, you will work closely with a TechLead and an internal team holding full domain knowledge, transitioning legacy services into a highly scalable, reactive microservices architecture while laying the foundation for long-term product maintenance and feature development. Details Start Date: ASAP / Strict July 2026 Start (Only currently available candidates can be considered). Duration: 6 months or longer. Max Rate: 140 PLN/h. Work Allocation: Full-time. Security & Compliance Constraint: Strictly NO AI tools allowed (Tools like GitHub Copilot, ChatGPT, or similar automated code assistants are completely banned on this project). Responsibilities System Migration: Re-architect and migrate the existing backend infrastructure from Nest.js (Node.js) over to Java and Spring Boot. Microservices & Reactive Design: Implement distributed, fault-tolerant microservices utilizing Netflix OSS and asynchronous, non-blocking reactive programming patterns. Database & Messaging Integration: Manage data persistence, caching mechanisms, and asynchronous message brokers to maintain high throughput and low-latency system data flow. Schema Evolution: Write and execute robust database migration scripts to smoothly transition underlying data structures without downtime. Quality Assurance: Guarantee code stability through thorough unit and integration testing. Cross-Functional Communication: Collaborate actively in regular project syncs with internal team members, the client, and the TechLead to refine system requirements. Requirements Core Backend Stack: Expert commercial knowledge of Java and the Spring Boot ecosystem. Microservices Architecture: Deep familiarity with Netflix OSS for service discovery, routing, and resilience patterns. Reactive Programming: Practical experience using Spring Reactor to handle asynchronous data streams. Data & Cache Layer: Strong hands-on experience with PostgreSQL (relational) and Redis (caching/in-memory data structure store). Message Broker: Solid proficiency with RabbitMQ for event-driven message queuing. Database Versioning: Proven experience handling database changes via Liquibase . Testing Stack: Mastery of JUnit and Mockito for reliable test-driven or test-backed development. Other Requirements Languages: Good English proficiency, allowing for smooth daily communication and clear understanding of complex business/legal requirements. Interpersonal Skills: Outstanding communication and teamwork capabilities for joint ownership of codebases. Legacy Ecosystem Context: Basic familiarity or comfort reading legacy system layouts spanning Nest.js, React.js, TypeScript, Docker, and Kubernetes is helpful to assist in extraction and migration mapping.

🏢 Summary: Staff Software Engineer (Backend) role focused on building advanced detection capabilities and scalable backend services across hybrid on‑prem and SaaS environments. The position involves architectural design, platform integrations, and leveraging AI/ML to enhance detection accuracy while mentoring engineers. It combines deep technical ownership with cross‑functional collaboration to drive product and platform improvements. 🗂️ Requirements: Degree in Computer Science or equivalent practical experience, 6+ years of experience building enterprise‑grade software with .NET, Experience designing and delivering scalable on‑prem and cloud‑based systems, Understanding of DevOps, CI/CD, and observability tooling, Strong knowledge of distributed systems and modular architectures, Experience with Docker, Kubernetes, and Infrastructure as Code, Ability to design REST APIs and asynchronous communication patterns, Proficiency in modern object‑oriented backend languages, Experience with high‑performance databases, Experience with Azure 📃 Skills: .NET, Azure, Docker, Kubernetes, IaC, CI/CD, DevOps, REST, PostgreSQL, EF, SQL, AI, ML, OOP 🏢 Description: We are looking for a Staff Software Engineer (backend oriented) , who will work on advanced detection capabilities, scalable backend services, and architectural improvements across hybrid environments. This role combines deep technical ownership with the opportunity to influence product direction and mentor other engineers. Responsibilities: Build and enhance detection features across services in hybrid environments Design scalable backend components for both on‑prem and SaaS deployments Contribute to platform‑wide integrations across multiple products Use AI/ML tools to improve detection accuracy, anomaly identification, and engineering productivity Collaborate with product, platform, and engineering leaders to align technical decisions with business goals Mentor engineers and support a culture focused on innovation, security, and technical excellence. Requirements: Degree in Computer Science or equivalent practical experience 6 - 10+ years of experience building enterprise‑grade software, including experience with .NET Background in designing and delivering scalable on‑prem and cloud‑based systems (ideally experience with Azure ) Understanding of DevOps, CI/CD, and observability tooling Strong understanding of distributed systems and modular architectures Experience with Docker, Kubernetes, and IaC Ability to design robust REST APIs and asynchronous communication patterns Proficiency in modern object‑oriented backend languages Experience with high‑performance databases (e.g., PostgreSQL, EF Core) Nice to have a solid knowledge of identity‑related technologies. Benefits: Attractive salary and benefits package, including Multisport card, insurance, and medical care Hybrid work from the Krakow office International work environment in a product company Training and development opportunities within the organization.

🏢 Summary: Entry-level Backend Engineer role focused on supporting the development of backend services and REST APIs under senior guidance. The position involves contributing to production systems, writing tested and maintainable code, and collaborating within a cross-functional engineering team. Ideal for candidates with foundational Java experience seeking hands-on experience in scalable and secure systems. 🗂️ Requirements: Bachelor's degree in Computer Science or related field (or currently pursuing), Minimum 0.5 years of Java experience, Practical experience with RESTful APIs, Ability to work with HTTP methods, status codes, and JSON, Experience writing SQL queries (SELECT, JOIN, WHERE, GROUP BY) or using ORM, Basic understanding of SQL and NoSQL differences, Knowledge of data structures and algorithms, Ability to use Git in a team environment (branching, pull requests, merge conflicts), Experience writing unit tests, Experience contributing code to production through review and deployment process 📃 Skills: Java, REST, HTTP, JSON, SQL, NoSQL, ORM, Git, JUnit, Pytest, Jest, CI, Algorithms, DataStructures, APIs, Testing 🏢 Description: (5190) About This Role You will be a part of the Engineering team and reports to our Manager, Engineering. You will support the development of backend services and APIs that power customer’s products. Working under close guidance from experienced engineers, you will gain hands-on experience contributing to real-world systems while learning best practices in software development, scalability, and security. Key Responsibilities Support the development of backend services and APIs under direct supervision of senior engineers Assist with writing clean, maintainable, and well-documented code following team standards Help debug, test, and troubleshoot backend systems and services Contribute to small tasks or components within larger projects Collaborate with cross-functional teams including Frontend, Product, and DevOps Participate in code reviews and apply feedback to improve technical skills Assist in writing unit tests and validating functionality Document technical processes and development work Required Qualifications Bachelor's degree in Computer Science or a related field; Currently pursuing is also an option Strong theoretical knowledge of Java, at least 0.5 years of experience Practical experience building and consuming RESTful APIs — HTTP methods, status codes, JSON, request/response handling, basic error handling. Working knowledge of databases — has written real SQL queries (SELECT, JOIN, WHERE, GROUP BY) or used an ORM in production code; understands the difference between SQL and NoSQL at a basic level. Solid understanding of data structures and algorithms — arrays, hash maps, trees, basic Big-O analysis — sufficient to discuss simple coding problems and reason about correctness. Comfortable with Git in a team setting — branching, pull requests, code review, addressing feedback, resolving merge conflicts; has worked in a shared repository with at least one other developer. Hands-on experience writing unit tests for their own code (pytest, JUnit, Jest, or equivalent), and basic familiarity with how testing fits into a CI pipeline. Demonstrated ability to ship code to production — even small features or bug fixes — through a real review and deployment process; ability to clearly describe what they built, how it was reviewed, and how it was tested. Genuine interest in cryptocurrency, blockchain, or Web3 (self-taught is fine — owning crypto, reading, side projects, hackathons) and willingness to learn the regulated FinTech context; English level: Upper-intermediate or higher, sufficient for daily team communication and code review discussions. Bonus: exposure to Linux / command line, Docker basics, message queues (Kafka, RabbitMQ), cloud platforms (AWS, GCP), open-source contributions, hackathon participation, or an active public GitHub portfolio.

🏢 Summary: The role involves building and scaling backend services for content discovery, licensing, and delivery platforms using Java and modern backend technologies. You will design RESTful APIs, implement event-driven systems, and model data to support analytics and reporting. The position focuses on clean architecture, scalable systems, and cloud-based deployments within the AWS ecosystem. 🗂️ Requirements: 5+ years backend development experience, Strong proficiency in Java, Experience with Spring Boot and Spring Framework, Experience designing and consuming REST APIs, Experience with Kafka or other streaming platforms, Strong knowledge of relational databases, Ability to write optimized SQL queries, Experience with GraphQL, Exposure to Python or willingness to learn 📃 Skills: Java, Spring, SpringBoot, REST, Kafka, SQL, GraphQL, Python, AWS, Aurora, DynamoDB, DBT, Databricks, Snowflake, Docker, Kubernetes, Node.js, TypeScript 🏢 Description: We're seeking a Software Java Engineer with 5+ years of experience to help build and scale the backend services that power our content discovery, licensing, and delivery platforms across all of our content libraries. You'll join a team that's passionate about clean architecture, performance, and solving complex challenges at scale. If you thrive in a collaborative environment and love building robust APIs, data-driven systems, and data modeling we'd love to hear from you. What You'll Do: Design, implement, and maintain backend services using Java, Spring Boot, and the broader Spring ecosystem. Build and evolve RESTful APIs that power content metadata, search, recommendation, and licensing workflows. Work with Kafka to build event-driven and real-time processing systems. Use SQL and work with relational databases to support structured content metadata. Partner with data and analytics teams to model data in data warehouses, supporting reporting and analytics use cases. Build and maintain DBT models to transform raw data into clean, usable datasets. Leverage the AWS ecosystem for service deployment, data storage, and pipeline orchestration. Contribute to technical discussions, system design, and code reviews. Requirements: 5+ years of professional backend development experience. Strong proficiency in Java, with experience using Spring Boot and Spring Framework. Experience designing and consuming REST APIs. Familiarity with Kafka or other message streaming platforms. Solid understanding of relational databases and writing optimized SQL. Comfortable working with GraphQL. Exposure to Python or willingness to learn. A collaborative mindset with strong communication skills. A passion for clean code, scalable systems, and continuous learning. Nice-to-Have: Practical experience working with data warehouses and DBT for data transformation and modeling. Hands-on experience working with the AWS ecosystem (especially Aurora/Dynamo DB). Experience working with Node.js and/or Typescript. Knowledge of containerization and orchestration (Docker, Kubernetes). Experience with Databricks/Snowflake. Background in building systems for search, metadata enrichment, or digital asset management. We offer: Flexible working format - remote, office-based or flexible A competitive salary and good compensation package Personalized career growth Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more) Active tech communities with regular knowledge sharing Education reimbursement Memorable anniversary presents Corporate events and team buildings Other location-specific benefits

🏢 Summary: The role involves developing and maintaining high-performance backend systems for advertising and e-commerce platforms, focusing on scalable microservices and real-time data processing using Kotlin and Spring Boot. You will design low-latency services, contribute to system architecture, and support production environments in a high-scale setting. The position also emphasizes AI-assisted development practices and collaboration within engineering teams. 🗂️ Requirements: 3+ years of backend development experience, Very good knowledge of Kotlin, Very good knowledge of Spring Boot, Hands-on experience with microservices architecture, Experience with NoSQL databases, Experience with MongoDB, Experience building and maintaining backend systems and APIs, Understanding of system design and scalable architecture, Experience with high-performance and high-scale systems, English B2 level, Polish C1 level, Work permit in the European Union, Openness to occasional visits to Warsaw office, Experience using AI-powered coding assistants 📃 Skills: Kotlin, SpringBoot, MongoDB, NoSQL, Microservices, REST, APIs, GenAI, Claude, GitHubCopilot, Cursor, AWS, Azure 🏢 Description: 🟣 You will be: developing and maintaining backend systems for advertising and e-commerce platforms, building low-latency, high-performance services processing large volumes of data, developing scalable microservices and APIs using Kotlin and Spring Boot, working on real-time event processing and advertising targeting mechanisms, contributing to architecture design and system scalability improvements, collaborating with stakeholders and supporting engineering best practices, including code reviews and code quality standards, participating in technical readiness/on-call support for production incidents a few days per month. 🟣 Your profile: 3+ years of professional experience in backend development, very good knowledge of Kotlin and Spring Boot, openness to occasional visits to the Warsaw office (1–2 days per quarter), hands-on experience with microservices architecture, practical experience working with NoSQL databases, especially MongoDB, experience building and maintaining backend systems and APIs, understanding of system design and scalable architecture principles, experience working with high-performance and high-scale systems, strong analytical thinking and problem-solving skills, ability to collaborate effectively with stakeholders and engineering teams, good communication skills in English (B2) and Polish (C1), practical experience using AI-powered assistants (e.g. Claude Code, GitHub Copilot, Cursor) to improve productivity, quality, or decision-making in software delivery. Work from the European Union region and a work permit are required. 🟣 Nice to have: experience applying GenAI in a more structured way within the SDLC, including defined workflows, prompt patterns, or tool integrations embedded into daily work, interest in and familiarity with emerging AI-driven practices (e.g. agent-based workflows, automation patterns, AI-augmented development), with a willingness to explore and experiment beyond standard approaches. 🟣 Recruitment Process: CV review – HR call – Technical Interview – Client Interview – Decision 🎁 Benefits 🎁 ✍ Development: development budgets of up to 6,800 PLN, we fund certifications e.g.: AWS, Azure, access to Udemy, O'Reilly (formerly Safari Books Online) and more, events and technology conferences, technology Guilds, internal training, Xebia Upskill. 🩺 We take care of your health: private medical healthcare, multiSport card - we subsidise a MultiSport card, mental Health Support. 🤸‍♂️ We are flexible: B2B or employment contract, contract for an indefinite period.

🏢 Summary: Backend-heavy Fullstack Engineer role focused on building and scaling a cyber risk reporting platform used by US MSPs. The position centers on designing and owning Node/NestJS backend systems, including integrations, job queues, and data modeling, within a fast-paced product environment. You will work closely with a small, autonomous team shipping features every sprint using AI-assisted development tools. 🗂️ Requirements: Minimum 2 years commercial backend experience in Node.js or NestJS, Production experience designing schemas and writing database migrations, Hands-on experience building and debugging job queues, Experience integrating third-party APIs on the backend, Solid knowledge of TypeScript, Working experience with React, Practical experience with PostgreSQL, Practical experience with Redis, Experience using Docker, Use of AI development tools, Fluent English, Availability to work evening hours aligned with US (UTC-6) team 📃 Skills: Node.js, NestJS, TypeScript, React, PostgreSQL, Redis, Docker, BullMQ, TypeORM, Auth0, Swagger, Express, Fastify, ConnectWise, Autotask, Kaseya, Microsoft365, GoogleWorkspace 🏢 Description: We're The Digital Bunch, a cross-disciplinary digital consultancy with offices in Warsaw, Riyadh, Sydney, and London. We combine strategy, design, and technology to help companies grow. Software development is one of our core verticals, and we embed with product companies long-term as part of their engineering teams. This role is for our work on a cyber risk reporting platform. The product scans networks, endpoints, and cloud environments (Microsoft 365, Google Workspace), checks breach databases, and generates risk reports with an AI layer on top for analysis and recommendations. The reports are sold to MSPs in the US who use them to show clients where they stand on security. It's cyber tooling, nothing else. The platform has been live for 5+ years, was acquired last year by a larger company (100+ people), and is actively growing. New features ship every sprint. The codebase is mature but moves fast. You'd join a small team on our side: our CTO and one other developer. On the client side in Dallas there's a PM, QA, support, and two engineers, plus people from the parent company who rotate in when needed. Flat setup, a lot of independence. We write code with Cursor and Claude Code every day. Not as a gimmick, that's how we actually work. If you're already using AI tooling, good. If not, you'll pick it up in the first week. ⚠️ Read this first, this is a backend-heavy role Most of the interesting work lives on the server: job queues, third-party integrations, data modeling, async scans, report generation. The frontend matters, but it's not where you'll spend most of your time. If your experience is mostly React with some REST calls, this isn't the right role. We need someone who's actually built and owned Node/NestJS backends in production, schemas, queues, integrations, migrations, the whole thing. We're happy to consider someone with ~2 years of experience if those two years are genuinely backend-heavy. We're not happy to consider 6 years of frontend with a skills-list backend section. ⏰ Working hours, read this too The client team is in Dallas, Texas (UTC-6). You need to be available in the evenings: - Daily standups happen between 19:00–21:00 Polish time, 30–45 minutes - Monday planning runs at 23:00 Polish time - The rest of the day is yours. Most people work something like 12:00–20:00 or 14:00–21:00 - No weekends, no on-call If you can't do evenings, this isn't the right fit. Wanted to be upfront about that. 📌 The work You'll ship features across the full stack, weighted toward the backend: NestJS on the server, PostgreSQL and Redis underneath, React on the frontend. The backend integrates with 15+ external services (breach intelligence APIs, cloud provider APIs, PSA systems like ConnectWise), runs BullMQ job queues, and uses TypeORM and Auth0. There's always something new to wire up. About 10% of your time goes to triaging production issues reported by customers. That's engineering debugging, not answering support tickets. Small team means you have real input into what gets built and how. Nobody's handing you pixel-perfect Jira tickets. We ship behind feature flags, get it in front of users fast, and iterate. If you're the type who spends three weeks perfecting architecture before writing a line of code, this isn't your pace. First-day commits. Our CTO onboards you personally, but we expect you shipping from the start. 👉 What we're looking for - At least 2 years of commercial backend work in Node.js / NestJS (or a close equivalent, Express or Fastify with real production ownership). We'll ask about it. - You've designed schemas, written migrations, debugged queues, and integrated third-party APIs, not just consumed them from a frontend - Solid TypeScript and React. You don't need to be a CSS wizard, you need to be comfortable moving across the stack - Hands-on with PostgreSQL, Redis, Docker - You use AI tools for development (Cursor, Claude Code, Copilot, whatever works for you) - Fluent English, spoken and written. You're on daily video calls with Americans - Actually okay with working late Polish hours (see above) - Self-directed. Nobody assigns you tasks step by step 👍 Bonus points - Worked in cybersecurity, SOC/SIEM tooling, or compliance before - Know your way around BullMQ, TypeORM, Auth0, or Swagger codegen - Built integrations with PSA systems (ConnectWise, Autotask, Kaseya) or MSP-facing tooling - Worked with US-based teams or in product companies 🚫 Probably not for you if - Your CV lists React/Next/Tailwind projects and the backend section is a skills list with no project evidence - You've mostly consumed REST APIs, not built them - Your backend experience is a single side project or a bootcamp module - You want to spend most of your day on UI polish 🎉 What you get - 20,000–26,000 PLN net/month, B2B - Fully remote, or Warsaw office in central Warsaw (dogs welcome) - Long-term product work on a single platform, not project hopping - Latest hardware and tooling - Multisport card - Regular salary reviews - Referral bonuses 💃 Hiring process 1. Intro call with Alex (CTO). 15–30 min. We talk about the role, you ask questions, and we see if it makes sense for both sides. 2. Take-home task. Build a small full-stack app (React + NestJS). The NestJS side carries most of the weight. Capped at 2 hours. Use AI tools, we don't care how you get there, we care that it works and you understand it. 3. Live review. 60 min. You walk us through your code, we ask you to add a feature live (should take minutes with AI, not half an hour), then we talk architecture and how you think about systems. 4. Meet the client team. Short call with the Dallas side before we finalize.

🏢 Summary: Senior Backend Engineer role focused on transforming a mission-critical e-commerce domain supporting subscriptions and purchasing journeys for millions of users. The position centers on migrating a monolithic system to scalable microservices, improving performance and reliability, and shaping the future architecture of a global platform. Engineers will work with event-driven systems and modern AI tools while owning solutions end-to-end. 🗂️ Requirements: 5+ years of professional backend engineering experience, Strong experience designing and operating microservices architectures, Experience modernising legacy systems and decomposing monoliths, Solid understanding of distributed systems and scalable backend design, Commercial experience with Go, Java, Kotlin or Scala, Hands-on experience with Kafka or similar event-streaming technologies, Hands-on experience with PostgreSQL, Hands-on experience with Docker and Kubernetes, Experience with CI/CD pipelines, Practical experience using AI coding assistants (Claude Code, Cursor, Copilot or similar), Ability to review and validate AI-generated code, Comfortable owning solutions from idea to production 📃 Skills: Go, Golang, Java, Kotlin, Scala, Kafka, PostgreSQL, Docker, Kubernetes, CI/CD, GraphQL, DDD, TDD, BDD, Microservices 🏢 Description: As a Senior Backend Engineer, you will join a global e-commerce technology organisation serving millions of customers across multiple international markets. The team is responsible for a critical customer-facing domain supporting subscriptions, plans, and purchasing journeys used daily by millions of users. This role focuses on transforming a mission-critical domain by modernising legacy systems, reducing technical debt, and building the next generation of scalable services. What You'll Do Build & Scale Core Services - Design, develop, and maintain scalable backend services within a distributed microservices architecture. - Build reliable systems supporting millions of customer interactions. - Improve performance, reliability, and scalability across critical customer-facing services. Drive Modernisation - Lead the migration of key business domains from monolithic systems to modern microservices. - Reduce technical debt and improve long-term maintainability. - Design solutions that support future platform growth. Shape Architecture - Participate in architecture discussions and technical decision-making. - Design orchestration layers supporting complex customer journeys and business processes. - Help define engineering standards and best practices. Work with Event-Driven Systems - Build and operate services powered by event-driven architectures. - Work extensively with Kafka and real-time lifecycle events. - Design resilient and observable distributed systems. Raise Engineering Standards - Conduct code reviews and provide technical guidance. - Promote best practices across software development, testing, deployment, and observability. - Contribute to a culture of ownership and continuous improvement. AI-Powered Engineering - Use modern AI tools and coding agents throughout the software development lifecycle. - Leverage AI for onboarding, architecture exploration, implementation, testing, debugging, and productivity improvements. - Apply engineering judgement to validate and safely integrate AI-generated outputs. What We're Looking For Backend Engineering Expertise - 5+ years of professional backend engineering experience. - Strong experience designing and operating microservices architectures. - Experience modernising legacy systems and decomposing monoliths. - Solid understanding of distributed systems and scalable backend design. Technical Stack - Commercial experience with Go (Golang), Java, Kotlin or Scala. - Engineers from a JVM background should be open to working in a Go-driven environment. - Hands-on experience with Kafka or similar event-streaming technologies. - Hands-on experience with PostgreSQL. - Experience with Docker, Kubernetes, and CI/CD pipelines. Product & Ownership Mindset - Comfortable owning solutions from idea through production. - Strong problem-solving skills and ability to make technical trade-offs. - Experience collaborating with product, business, and engineering stakeholders. AI Fluency - Practical experience using AI coding assistants such as Claude Code, Cursor, Copilot, or similar tools. - Understanding of how context, prompts, constraints, and validation influence AI-generated outputs. - Ability to critically review and verify AI-generated solutions. Nice to Have - Experience with subscription-based products. - Experience in e-commerce environments. - GraphQL knowledge. - Familiarity with DDD, TDD, and BDD practices. What We Offer - Opportunity to build systems used by millions of customers globally. - High-impact engineering work with significant architectural ownership. - International collaboration across distributed engineering teams. - End-to-end ownership from idea to production. - Hybrid working model (3 days per week in the Warsaw office). - B2B cooperation model. - 30 days of paid annual leave. - Modern office located in Warsaw city centre. - Continuous learning and professional growth opportunities.

🏢 Summary: Engineering role focused on building and modernizing large-scale settlement and cash processing systems that power financial operations and regulatory reporting. The position involves designing scalable backend and data platforms processing millions of daily transactions, while collaborating closely with Finance and Product stakeholders. Key initiatives include revamping the historical settlement system and expanding into payment fees analytics. 🗂️ Requirements: Deep expertise in backend engineering (Java) or data engineering, Experience processing large-scale transactional and financial data, Experience with batch or streaming frameworks (Spark, Flink, or Beam), Proficiency in Scala for data engineering, Experience building scalable backend systems in Java, Strong understanding of system design, data structures, and algorithms, Experience with cloud-native development, preferably Google Cloud Platform, Ability to design reliable, maintainable, and auditable systems 📃 Skills: Java, Scala, Spark, Flink, Beam, GCP, SQL, Algorithms, DataStructures, Cloud, Backend, DataEngineering 🏢 Description: Our team is building the settlement and cash processing systems that drive how cash from our customers is processed and accounted for — enabling reliable, scalable financial operations across every market, product line, and partner. Our systems are essential to our stakeholders’ ability to track and report revenue and taxes, supporting all of our core business lines. As engineers on this team, we design and maintain the backend and data platform capabilities that power millions of transactions each day with precision. We build services that handle settlement and bank transactions, produce compliant financial records, and support regulatory requirements across global markets — all while staying agile to keep up with our evolving business model and staying in sync with our many payment partners. We build robust services that provide clarity over what’s happening under the hood of millions of daily transactions, enabling quick action to any disruption. Our modular, process-oriented components simplify the development, maintenance, and scaling of the critical Order to Cash enterprise process that underpin the financial operations. We are starting two major initiatives: a revamp of our historical settlement system in order to align with our modularity strategy as well as expanding into the adjacent domain of payment fees, which is a massive cost center in need of good data for analytics in order to optimize the space. We’re looking for engineers passionate about building complex, high-impact systems. You’ll work closely with stakeholders in Finance (Accounting and Payments), Product, and Engineering to design solutions that are scalable, auditable, and robust. If you’re energized by the challenge of transforming intricate business processes into clean, extensible platforms we’d love to have you on the team. What You’ll Do - Gain deep expertise in client’s revenue and settlement systems, understanding how it enables financial operations, compliance, and strategic decision-making across the company. - Design and implement scalable backend and data systems that process millions of transactions daily to enable the cash-application process and financial reporting. - Build intuitive, self-serve tools that empower Finance teams to define and manage product-specific revenue and settlement configuration independently, without requiring engineering involvement. - Develop and enhance modular platform capabilities that encodes critical enterprise workflows, promoting consistency, reusability, and ease of maintenance across financial systems. - Partner closely with Engineers, Product and Finance stakeholders to design systems that are scalable, auditable, and highly reliable. - Champion engineering best practices, strong architectural design, and operational excellence across backend and data platforms. - Foster a collaborative team culture rooted in shared ownership, constructive feedback, and continuous improvement. Who You Are - You possess a T-shaped engineering skill set — deep expertise in either data or backend engineering (Java), while growing the ability to work effectively across both. For this role, experience or familiarity with processing large-scale transactional and financial data, using batch/streaming frameworks like Spark, Flink, or Beam (with Scala for data engineering), and building scalable backend systems in Java is a strong advantage. - You possess a foundational understanding of system design, data structures, and algorithms, coupled with a strong desire to learn quickly, embrace feedback, and continuously improve your technical skills. - You’re familiar with cloud-native development and deployment, ideally within the Google Cloud Platform. - You think critically about system design and strive to build solutions that are reliable, maintainable, and auditable at scale. - You have good communication skills and can articulate your ideas and ask clarifying questions. - You love collaborating with others. - You thrive in ambiguous and fast-changing environments, and know how to make progress even when requirements are evolving. - You approach platform engineering with empathy for your users — prioritizing usability, configurability, and long-term sustainability. - You care deeply about code quality, testing, and documentation, and you aim to build systems that are easy to understand and operate. - You enjoy collaborating across functions and bring clarity and alignment when working with engineering, finance, and product partners. - You’re naturally curious, self-motivated, and always looking for ways to grow your technical skills and improve how things are done. Other Details Start: Asap or August Length: 6 months Workplace: Sweden

🏢 Summary: The offer is for a Backend Developer role focused on building and maintaining high-performance, low-latency systems for advertising and e-commerce platforms. The position involves developing scalable microservices and APIs using Kotlin and Spring Boot, working with real-time event processing, and contributing to system architecture and scalability. The role also includes production support and collaboration within cross-functional engineering teams. 🗂️ Requirements: 3+ years of professional experience in Java backend development, Very good knowledge of Kotlin, Very good knowledge of Spring Boot, Hands-on experience with microservices architecture, Practical experience with NoSQL databases, Experience with MongoDB, Experience building and maintaining backend systems and APIs, Understanding of system design and scalable architecture principles, Experience with high-performance and high-scale systems, English level B2, Polish level C1, Experience with AI-powered coding assistants, Work permit for EU and ability to work from EU region, Availability for occasional visits to Warsaw office 📃 Skills: Java, Kotlin, Spring, SpringBoot, Microservices, MongoDB, NoSQL, REST, API, AI, Claude, Copilot, Cursor 🏢 Description: 🟣 You will be: developing and maintaining backend systems for advertising and e-commerce platforms, building low-latency, high-performance services processing large volumes of data, developing scalable microservices and APIs using Kotlin and Spring Boot, working on real-time event processing and advertising targeting mechanisms, contributing to architecture design and system scalability improvements, collaborating with stakeholders and supporting engineering best practices, including code reviews and code quality standards, participating in technical readiness/on-call support for production incidents a few days per month. 🟣 Your profile: 3+ years of professional experience in Java backend development, very good knowledge of Kotlin and Spring Boot, openness to occasional visits to the Warsaw office (1–2 days per quarter), hands-on experience with microservices architecture, practical experience working with NoSQL databases, especially MongoDB, experience building and maintaining backend systems and APIs, understanding of system design and scalable architecture principles, experience working with high-performance and high-scale systems, strong analytical thinking and problem-solving skills, ability to collaborate effectively with stakeholders and engineering teams, good communication skills in English (B2) and Polish (C1), practical experience using AI-powered assistants (e.g. Claude Code, GitHub Copilot, Cursor) to improve productivity, quality, or decision-making in software delivery. immediate availability or a short notice period is preferred. Work from the European Union region and a work permit are required. 🟣 Nice to have: experience applying GenAI in a more structured way within the SDLC, including defined workflows, prompt patterns, or tool integrations embedded into daily work, interest in and familiarity with emerging AI-driven practices (e.g. agent-based workflows, automation patterns, AI-augmented development), with a willingness to explore and experiment beyond standard approaches. 🟣 Recruitment Process: CV review – HR call – Technical Interview – Client Interview – Decision 🎁 Benefits 🎁 ✍ Development: development budgets of up to 6,800 PLN, we fund certifications e.g.: AWS, Azure, access to Udemy, O'Reilly (formerly Safari Books Online) and more, events and technology conferences, technology Guilds, internal training, Xebia Upskill. 🩺 We take care of your health: private medical healthcare, multiSport card - we subsidise a MultiSport card, mental Health Support. 🤸‍♂️ We are flexible: B2B or employment contract, contract for an indefinite period.