Back-end Developer with AI Experience

🏢 Summary: Software Engineer on the AI Data team responsible for building and operating large-scale audio data ingestion pipelines to support model training. The role focuses on sourcing audio data, extending cloud infrastructure on GCP with Terraform, and collaborating with scientists to optimize cost, throughput, and data quality at petabyte scale. This position directly powers next-generation AI-driven consumer and enterprise products. 🗂️ Requirements: BS/MS/PhD in Computer Science or related field, 5+ years of industry experience in software development, Proficiency in Bash scripting, Proficiency in Python, Experience working in Linux environments, Experience with Docker, Experience with Infrastructure-as-Code concepts, Professional experience with a major cloud provider, Strong communication skills (written and verbal) 📃 Skills: Python, Bash, Linux, Docker, Terraform, GCP, Cloud, Infrastructure-as-Code, Web, Data, AI 🏢 Description: Overview We're looking to hire for our Data side of our AI team. This role is responsible for all aspects of data collection to support our model training operations. We build high-quality datasets at petabyte-scale and low cost through tight integration of infrastructure, engineering, and research work. We are looking for a skilled Software Engineer to join us. What You'll Do - Be scrappy to find new sources of audio data and bring it into our ingestion pipeline - Operate and extend the cloud infrastructure for our ingestion pipeline, currently running on GCP and managed with Terraform - Collaborate closely with Scientists to shift the cost/throughput/quality frontier, delivering richer data at bigger scale and lower cost to power next-generation models - Collaborate with others on the AI Team and Leadership to craft the dataset roadmap to power next-generation consumer and enterprise products An Ideal Candidate Should Have - BS/MS/PhD in Computer Science or a related field - 5+ years of industry experience in software development - Proficiency with bash/Python scripting in Linux environments - Proficiency in Docker and Infrastructure-as-Code concepts and professional experience with at least one major Cloud Provider (GCP) - Experience with web crawlers and large-scale data processing workflows is a plus - Ability to handle multiple tasks and adapt to changing priorities - Strong communication skills, both written and verbal What We Offer - A fast-growing environment where you can help shape the company and product - An entrepreneurial-minded team that supports risk, intuition, and hustle - A hands-off management approach so you can focus and do your best work - An opportunity to make a big impact in a transformative industry - Competitive salaries, bonus, and equity depending on experience - A friendly and laid-back atmosphere with a commitment to building a strong asynchronous culture - Opportunity to work on a product used by millions of people - Work in the fast-growing intersection of artificial intelligence and audio

🏢 Summary: Senior Test Engineer role focused on ensuring quality for a global social shopping platform combining e-commerce and social networking. The position involves end-to-end QA ownership across web and mobile platforms, including manual, UI, regression, and API testing. Candidates will collaborate with cross-functional teams in an agile environment while supporting release processes and accessibility initiatives. 🗂️ Requirements: 4.5+ years of QA experience, End-to-end ownership of testing processes, Strong exploratory testing skills, Experience testing iOS and Android applications, Ability to work autonomously across cross-functional teams, Familiarity with agile workflows, Experience with feature flags and staged rollouts, Strong requirements analysis skills, Ability to support multiple teams in parallel, SQL query writing, REST API testing experience with Postman, Understanding of HTML, CSS, cookies, caching, browser behavior, Experience deploying builds via Android Studio or Xcode, Practical Git experience, Upper-Intermediate English proficiency 📃 Skills: QA, SQL, REST, Postman, HTML, CSS, Git, AndroidStudio, Xcode, iOS, Android 🏢 Description: Join Sigma Software as a Senior Test Engineer and help shape the quality of a cutting-edge social shopping platform that blends e-commerce with social networking. This role offers the opportunity to work on a high-impact product used by millions of fashion lovers worldwide. You will be part of our Mobile & Web Solutions department, collaborating with talented professionals and applying the Quality Assistance model to ensure exceptional user experiences. We at Sigma Software value innovation, teamwork, and professional growth. By joining us, you will gain access to diverse projects, supportive colleagues, and a culture that rewards initiative and expertise. CUSTOMER Global marketplace for fashion, combining e-commerce with social networking features. It enables users to sell customized or rare clothes and accessories, promoting sustainable consumption by recycling unwanted items for money. PROJECT The project is a social shopping platform where users create profile pages to post pictures and descriptions of items for sale, enhanced with hashtags for easier discovery. Focused on clothes retail, it aims to deliver an evocative buying and selling experience. Key tasks include payment system integration and accessibility feature implementation. Responsibilities Work as part of the product development team, collaborating closely with customer-side developers Follow and support the Quality Assistance process Plan and estimate testing activities Create and maintain test documentation Design and execute manual, snapshot, and UI tests for new features Perform Functional, Regression, and Compatibility testing across Web and Mobile platforms Conduct release validation, smoke testing, and post-deployment quality checks Provide clear and regular status and progress reports Collaborate with product owners, business analysts, and development teams to ensure product quality Requirements 4,5+ years of QA experience with end-to-end ownership of testing processes Strong exploratory testing skills beyond scripted test cases Experience testing mobile apps (iOS and Android), including release processes Ability to work autonomously across multiple cross-functional teams Familiarity with agile workflows, feature flags, and staged rollouts Strong requirements analysis skills, able to clarify edge/corner scenarios Comfortable with context switching and supporting multiple teams in parallel SQL — ability to write moderately complex queries API Testing — hands-on experience with REST APIs using tools like Postman Solid understanding of HTML, CSS, cookies, caching, browser behavior Experience deploying builds via Android Studio, Xcode, or similar tools Git — practical experience with branches, commits, code reviews, pull/merge requests Upper-Intermediate+ English proficiency

🏢 Summary: Software Engineer role focused on modernizing a mission-critical aviation platform by developing cloud-hosted backend services and scalable cloud-native solutions in AWS. The position involves backend modernization, Kubernetes and container management, CI/CD automation, and operational reliability improvements in a distributed engineering environment. The role offers hybrid work flexibility, B2B or UoP employment, and benefits including healthcare and life insurance. 🗂️ Requirements: Experience developing backend applications in cloud environments, Strong knowledge of AWS and cloud-native architectures, Hands-on experience with Linux, Hands-on experience with Docker, Hands-on experience with Apache, Hands-on experience with Java, Hands-on experience with Spring Boot, Experience with Kubernetes and containerized workloads, Experience with CI/CD, Experience with Infrastructure as Code, Experience with automation, Understanding of cloud security, Understanding of monitoring and production support practices, Strong troubleshooting and problem-solving skills, Ability to work independently and collaborate within distributed teams, English level B2 or higher 📃 Skills: AWS, Linux, Docker, Apache, Java, Spring, Kubernetes, CI/CD, IaC, Automation, SQL, MySQL, Security, Monitoring 🏢 Description: We are looking for a Software Engineer to join a team responsible for modernizing a mission-critical aviation platform used by tens of thousands of customers worldwide. You will help design, build, and evolve cloud-hosted backend services that support the distribution of aviation data across desktop, mobile, and aircraft-connected workflows. This is a unique opportunity to work on a high-impact product while contributing to a large-scale modernization initiative focused on cloud-native architecture, automation, scalability, security, and operational excellence. Working closely with cross-functional teams, you will help transform a well-established platform into a modern, resilient, and highly scalable ecosystem capable of supporting future growth and new product offerings. Key responsibilities Develop and modernize backend services hosted in AWS Design and implement scalable, resilient cloud-native solutions Build and improve APIs, integrations, and automated backend processes Enhance CI/CD pipelines, infrastructure automation, monitoring, and observability Manage and troubleshoot Kubernetes-based environments and containerized applications Support production systems and drive reliability, security, and operational improvements Collaborate with product, mobile, desktop, QA, and DevOps teams to deliver high-quality solutions Leverage AI-assisted development tools to improve engineering efficiency while maintaining high standards of quality and security Ideal candidate profile Experience developing backend applications in cloud environments Strong knowledge of AWS and cloud-native architectures Hands-on experience with Linux, Docker, Apache, Java and Spring Boot Experience with Kubernetes and containerized workloads Experience with CI/CD, Infrastructure as Code, and automation Understanding of cloud security, monitoring, and production support practices Strong troubleshooting and problem-solving skills Ability to work independently and collaborate within distributed teams English min. B2. Nice to Have: Experience modernizing legacy applications and services Experience with SQL Server and MySQL Experience building highly available and resilient production systems Experience using AI-assisted software development tools Conditions Employment type: B2B or UoP Location: Gdańsk Work model: 1 day a month in the office in Gdańsk or less frequently, depending on your availability Salary: 190 PLN net/h - to negotiate Benefits: life insurance, private healthcare, Multisport card

🏢 Summary: Software Engineer on the AI Data team responsible for building and scaling data collection and ingestion infrastructure to support large-scale model training. The role focuses on sourcing audio data, operating cloud-based pipelines on GCP, and collaborating with scientists to optimize dataset quality, cost, and throughput. This position directly powers next-generation AI models through petabyte-scale data engineering. 🗂️ Requirements: BS/MS/PhD in Computer Science or related field, 5+ years of software development experience, Proficiency in Bash scripting, Proficiency in Python, Experience working in Linux environments, Experience with Docker, Experience with Infrastructure-as-Code, Professional experience with at least one major cloud provider, Strong written and verbal communication skills 📃 Skills: Python, Bash, Linux, Docker, Terraform, GCP, Cloud, Infrastructure-as-Code, WebCrawlers, DataProcessing 🏢 Description: Overview We're looking to hire for our Data side of our AI team. This role is responsible for all aspects of data collection to support our model training operations. We build high-quality datasets at petabyte scale and low cost through tight integration of infrastructure, engineering, and research work. We are looking for a skilled Software Engineer to join us. What You'll Do - Be scrappy to find new sources of audio data and bring it into our ingestion pipeline - Operate and extend the cloud infrastructure for our ingestion pipeline, currently running on GCP and managed with Terraform - Collaborate closely with Scientists to shift the cost/throughput/quality frontier, delivering richer data at bigger scale and lower cost to power next-generation models - Collaborate with the AI Team and Leadership to craft the dataset roadmap for next-generation consumer and enterprise products An Ideal Candidate Should Have - BS/MS/PhD in Computer Science or a related field - 5+ years of industry experience in software development - Proficiency with bash/Python scripting in Linux environments - Proficiency in Docker and Infrastructure-as-Code concepts and professional experience with at least one major Cloud Provider (GCP used) - Experience with web crawlers and large-scale data processing workflows is a plus - Ability to handle multiple tasks and adapt to changing priorities - Strong communication skills, both written and verbal What We Offer - A fast-growing environment where you can help shape the company and product - An entrepreneurial-minded team that supports risk, intuition, and hustle - A hands-off management approach so you can focus and do your best work - An opportunity to make a big impact in a transformative industry - Competitive salary, bonus, and equity depending on experience - Opportunity to work on a product used by millions of people - Work at the intersection of artificial intelligence and audio

🏢 Summary: The offer is for a Software Engineer to modernize and develop cloud-hosted backend services for a mission-critical aviation platform used globally. The role focuses on building scalable, resilient, cloud-native solutions in AWS, improving automation, CI/CD, and Kubernetes-based environments. You will contribute to transforming a legacy system into a modern, secure, and highly scalable ecosystem. 🗂️ Requirements: Experience developing backend applications in cloud environments, Hands-on experience with Linux, Docker, Apache, PHP, Strong knowledge of AWS and cloud-native architectures, Experience with Kubernetes and containerized workloads, Experience with CI/CD and Infrastructure as Code, Knowledge of cloud security and monitoring practices, Ability to troubleshoot production systems, English B2 level or higher 📃 Skills: AWS, Linux, Docker, Apache, PHP, Kubernetes, CI/CD, IaC, SQL, MySQL, SQLServer, AI 🏢 Description: We are looking for a Software Engineer to join a team responsible for modernizing a mission-critical aviation platform used by tens of thousands of customers worldwide. You will help design, build, and evolve cloud-hosted backend services that support the distribution of aviation data across desktop, mobile, and aircraft-connected workflows. This is a unique opportunity to work on a high-impact product while contributing to a large-scale modernization initiative focused on cloud-native architecture, automation, scalability, security, and operational excellence. Working closely with cross-functional teams, you will help transform a well-established platform into a modern, resilient, and highly scalable ecosystem capable of supporting future growth and new product offerings. Key responsibilities Develop and modernize backend services hosted in AWS Design and implement scalable, resilient cloud-native solutions Build and improve APIs, integrations, and automated backend processes Enhance CI/CD pipelines, infrastructure automation, monitoring, and observability Manage and troubleshoot Kubernetes-based environments and containerized applications Support production systems and drive reliability, security, and operational improvements Collaborate with product, mobile, desktop, QA, and DevOps teams to deliver high-quality solutions Leverage AI-assisted development tools to improve engineering efficiency while maintaining high standards of quality and security Ideal candidate profile Experience developing backend applications in cloud environments Hands-on experience with Linux, Docker, Apache, and PHP or Java Strong knowledge of AWS and cloud-native architectures Experience with Kubernetes and containerized workloads Experience with CI/CD, Infrastructure as Code, and automation Understanding of cloud security, monitoring, and production support practices Strong troubleshooting and problem-solving skills Ability to work independently and collaborate within distributed teams English min. B2. Nice to Have: Experience modernizing legacy applications and services Experience with SQL Server and MySQL Experience building highly available and resilient production systems Experience using AI-assisted software development tools Conditions Employment type: B2B or UoP Location: Gdańsk Work model: 1 day a week in the office in Gdańsk or less frequently, depending on your availability Salary: up to 190 PLN net/h Benefits: life insurance, private healthcare, Multisport card Recruitment steps Recruitment call with Agnieszka from KUBO Client interview (may require 2 rounds) Feedback and decision

🏢 Summary: Opportunity to modernize a mission-critical aviation platform by designing and developing cloud-hosted backend services in a scalable, cloud-native AWS environment. The role focuses on building resilient APIs, improving automation and CI/CD pipelines, and managing Kubernetes-based infrastructure to support global aviation data distribution. You will contribute to a large-scale modernization initiative emphasizing scalability, security, and operational excellence. 🗂️ Requirements: Experience developing backend applications in cloud environments, Hands-on experience with Linux, Docker, Apache, and PHP or Java, Strong knowledge of AWS and cloud-native architectures, Experience with Kubernetes and containerized workloads, Experience with CI/CD and Infrastructure as Code, Understanding of cloud security, monitoring, and production support practices, Strong troubleshooting and problem-solving skills, English proficiency at minimum B2 level 📃 Skills: AWS, Linux, Docker, Apache, PHP, Java, Kubernetes, CI/CD, IaC, SQL, SQLServer, MySQL, AI 🏢 Description: We are looking for a Software Engineer to join a team responsible for modernizing a mission-critical aviation platform used by tens of thousands of customers worldwide. You will help design, build, and evolve cloud-hosted backend services that support the distribution of aviation data across desktop, mobile, and aircraft-connected workflows. This is a unique opportunity to work on a high-impact product while contributing to a large-scale modernization initiative focused on cloud-native architecture, automation, scalability, security, and operational excellence. Working closely with cross-functional teams, you will help transform a well-established platform into a modern, resilient, and highly scalable ecosystem capable of supporting future growth and new product offerings. Key responsibilities Develop and modernize backend services hosted in AWS Design and implement scalable, resilient cloud-native solutions Build and improve APIs, integrations, and automated backend processes Enhance CI/CD pipelines, infrastructure automation, monitoring, and observability Manage and troubleshoot Kubernetes-based environments and containerized applications Support production systems and drive reliability, security, and operational improvements Collaborate with product, mobile, desktop, QA, and DevOps teams to deliver high-quality solutions Leverage AI-assisted development tools to improve engineering efficiency while maintaining high standards of quality and security Ideal candidate profile Experience developing backend applications in cloud environments Hands-on experience with Linux, Docker, Apache, and PHP or Java Strong knowledge of AWS and cloud-native architectures Experience with Kubernetes and containerized workloads Experience with CI/CD, Infrastructure as Code, and automation Understanding of cloud security, monitoring, and production support practices Strong troubleshooting and problem-solving skills Ability to work independently and collaborate within distributed teams English min. B2. Nice to Have: Experience modernizing legacy applications and services Experience with SQL Server and MySQL Experience building highly available and resilient production systems Experience using AI-assisted software development tools Conditions Employment type: B2B or UoP Location: Gdańsk Work model: 1 day a week in the office in Gdańsk or less frequently, depending on your availability Salary: up to 190 PLN net/h Benefits: life insurance, private healthcare, Multisport card Recruitment steps Recruitment call with Agnieszka from KUBO Client interview (may require 2 rounds) Feedback and decision

🏢 Summary: Senior Software Engineer role focused on designing and delivering new features and PoCs end-to-end on a large-scale SaaS and data platform. The position emphasizes backend development in Python, extending a mature system, and leveraging AI/LLM tools to accelerate development and improve engineering workflows. Fully remote with high ownership and impact on product direction. 🗂️ Requirements: 7+ years of Software Engineering experience, Strong experience with Python, Experience with Django, Experience building large-scale production systems, Experience designing and maintaining REST APIs, Strong understanding of distributed systems, Strong understanding of backend architecture, Daily practical use of AI tools and LLMs in development workflows, Experience with cloud environments, Ability to independently design and deliver end-to-end solutions, Professional English proficiency 📃 Skills: Python, Django, REST, API, SaaS, LLM, AI, Cloud, DistributedSystems, Backend 🏢 Description: Does building awesome, innovative products that add up to something meaningful sound like a dream come true? Come join us and make that vision a reality! About We are looking for a product-driven Senior Software Engineer who thrives in fast-paced environments and enjoys turning ideas into practical, user-focused solutions. In this role, you will independently design and deliver new features and PoC end-to-end on top of an existing large-scale SaaS and data platform. Rather than working in a purely greenfield environment, you will extend and evolve a mature platform with new capabilities, focusing on speed, usability, and real customer value. A key part of this role is the daily use of AI and LLM-based tools to accelerate development workflows, prototyping, research, testing, and delivery. We are looking for someone who not only uses AI tools effectively but also understands how to integrate AI reasoning and automation into modern software engineering practices. Responsibilities Independently design, prototype, and deliver new features and PoCs end-to-end Translate product ideas into scalable and user-focused backend solutions Validate technical feasibility and make pragmatic architectural decisions Use AI tools, coding copilots, and LLM-based workflows to accelerate development, experimentation, and delivery Build and maintain scalable backend services and REST APIs using Python (preferably Django) Collaborate closely with Product, Design, and Engineering teams to shape and refine new features Contribute to engineering quality through code reviews, technical guidance, and knowledge sharing Continuously explore and introduce practical AI-driven workflows that improve engineering productivity and delivery speed Our offer Competitive salary on B2B contract Fully remote position Real impact and independence at work Individual career path Work-life balance A non-corporate atmosphere where innovation, personal growth, and teamwork thrive 100+ smart, curious & ambitious engineers What you bring 7+ years of experience as a Software Engineer Strong experience with Python and preferably Django Experience building and maintaining large-scale production systems and REST APIs Strong understanding of distributed systems and modern backend architecture Demonstrated daily use of AI tools and LLMs in real engineering workflows (e.g. code generation, prototyping, refactoring, testing, documentation, automation) Experience integrating with complex platforms and cloud environments Ability to independently deliver solutions with minimal supervision Strong product mindset and focus on solving real user problems Excellent communication and collaboration skills across Product, Design, and Engineering teams Curiosity, ownership, and passion for learning and experimenting with new technologies Professional level of English Nice to Have Experience mentoring or coaching engineers Experience working with data products and related scalability challenges Experience promoting AI-driven engineering practices and helping teams adopt modern AI workflows Benefits International Projects Small Teams Flat Structure Friendly Atmosphere Flexible Hours Individual Career Path We want your TALENT! Don’t hesitate and APPLY! We are happy to tell you more details about this position in a phone call. Our recruitment process is very fast and straightforward to ensure a great experience from the first interview to joining your dream team!

🏢 Summary: Software Engineer on the AI Data team responsible for building and scaling data collection and ingestion infrastructure to support large-scale model training. The role focuses on sourcing audio data, operating cloud-based pipelines on GCP, and collaborating with scientists to optimize cost, throughput, and quality. You will help power next-generation AI models by delivering high-quality datasets at petabyte scale. 🗂️ Requirements: BS/MS/PhD in Computer Science or related field, 5+ years of industry experience in software development, Proficiency in Bash and Python scripting, Experience working in Linux environments, Proficiency in Docker, Experience with Infrastructure-as-Code, Professional experience with at least one major cloud provider (GCP preferred), Ability to manage multiple tasks and changing priorities, Strong written and verbal communication skills 📃 Skills: Python, Bash, Linux, Docker, Terraform, GCP, Infrastructure-as-Code, Web, Crawlers, Data, Processing, Cloud 🏢 Description: Overview We're looking to hire for our Data side of our AI team at Speechify. This role is responsible for all aspects of data collection to support our model training operations. We are able to build high-quality datasets at petabyte-scale and low cost through a tight integration of infrastructure, engineering, and research work. We are looking for a skilled Software Engineer to join us. What You'll Do - Be scrappy to find new sources of audio data and bring it into our ingestion pipeline - Operate and extend the cloud infrastructure for our ingestion pipeline, currently running on GCP and managed with Terraform - Collaborate closely with our Scientists to shift the cost/throughput/quality frontier, delivering richer data at bigger scale and lower cost to power our next-generation models - Collaborate with others on the AI Team and Leadership to craft the dataset roadmap to power next-generation consumer and enterprise products An Ideal Candidate Should Have - BS/MS/PhD in Computer Science or a related field - 5+ years of industry experience in software development - Proficiency with Bash/Python scripting in Linux environments - Proficiency in Docker and Infrastructure-as-Code concepts and professional experience with at least one major Cloud Provider (GCP) - Experience with web crawlers and large-scale data processing workflows is a plus - Ability to handle multiple tasks and adapt to changing priorities - Strong communication skills, both written and verbal What We Offer - A fast-growing environment where you can help shape the company and product - An entrepreneurial-minded team that supports risk, intuition, and hustle - A hands-off management approach so you can focus and do your best work - An opportunity to make a big impact in a transformative industry - Competitive salary, bonus, and equity depending on experience - Opportunity to work on a product used by millions of people - Work in the intersection of artificial intelligence and audio

🏢 Summary: Senior Software Engineer role focused on maintaining and extending a SaaS platform using Scala and Python, with strong emphasis on AI/LLM integrations and backend architecture. The position involves building production-grade backend services, integrating generative AI and transcription tools, and supporting scalable cloud-based systems in an international engineering environment. B2B contract with long-term extension potential. 🗂️ Requirements: 7+ years of backend software engineering experience, Advanced Polish language skills, English at B2/C1 level, Production experience with Scala, Production experience with Python, Ability to maintain dual-language codebases, Knowledge of software architecture, Understanding of clean code principles, Experience with automated testing, Experience with code reviews, Knowledge of version control 📃 Skills: Scala, Python, REST, GenAI, LLM, AWS, Azure, GCP, CI/CD, ElasticSearch, PHP, SaaS, API, Git 🏢 Description: Kim jest H2B Group? Jesteśmy firmą konsultingową, która pomaga klientom w automatyzacji procesów biznesowych przy pomocy AI, a specjalistom IT rozwijać karierę w modelu B2B. Oferujemy projekty z branż takich jak fintech, medtech, edutech czy automatyka przemysłowa. Dzięki ścisłej współpracy wspieramy rozwój naszych klientów poprzez dostarczanie szybkich i mierzalnych efektów, jednocześnie zapewniając specjalistom IT możliwości rozwoju kariery i zdobywania cennego doświadczenia. Dlaczego warto z nami współpracować? ✨ Elastyczność – Wybierasz projekty dopasowane do swoich umiejętności i zainteresowań, z możliwością zmiany w ramach naszej firmy lub grupy Euvic, której jesteśmy częścią. 💡 Przejrzystość – Masz jasne zasady współpracy i pełną transparentność wynagrodzenia oraz warunków. 🚀 Szybkość działania – Dzięki naszej efektywności szybko znajdziesz lub zmienisz projekt, który idealnie odpowiada Twoim kompetencjom. 🌟 Możliwość rozwoju – Pracujesz przy innowacyjnych projektach, rozwijając kluczowe kompetencje i zdobywając cenne doświadczenie. Do projektu naszego klienta poszukujemy osoby na stanowisko Senior Software Engineera (Scala & Python) Join an international engineering team focused on evolving and scaling an established SaaS platform . In this role, you will bridge two ecosystems: maintaining the core infrastructure built in Scala while developing new, advanced features primarily in Python . A key focus of the project is the deployment of cutting-edge AI capabilities , including integrations with external AI/LLM providers, transcription services, and internal machine learning models. Key Responsibilities Hybrid Backend Development: Developing, maintaining, and extending robust backend services using both Scala (existing codebase) and Python (new features). AI & LLM Integrations: Designing and implementing production-ready features driven by Generative AI, integrating external and internal AI platform APIs, LLM providers, and transcription tools. System Architecture: Participating in technical discussions, code reviews, and architectural decisions to ensure system scalability, performance, and security. API & Integration Design: Designing reliable, maintainable REST APIs and seamless integrations between core platform services and external third-party systems. Quality & Automation: Writing clean, well-documented, and thoroughly testable code while supporting modern CI/CD pipelines and automated testing practices. Production Support: Troubleshooting production issues, optimizing performance/costs of AI workloads, and continuously improving platform stability. Requirements Experience: Minimum 7+ years of professional experience in backend software engineering. Languages: Fluent Polish (advanced) AND English at a minimum B2/C1 level (working in an international engineering environment). Technical Ecosystem: Proven production-grade experience with both Scala and Python , along with the ability to navigate and maintain dual-language codebases efficiently. Engineering Practices: Solid understanding of software architecture, clean code principles, automated testing, code reviews, and version control. Nice to Have: GenAI / LLM Experience: Commercial experience integrating LLMs, generative AI APIs, or building workflows around speech-to-text/transcription tools. Cloud & Infrastructure: Hands-on experience with major cloud platforms ( AWS, Azure, or GCP ) and modern CI/CD pipelines. Search & Data: Practical knowledge of ElasticSearch for scalable data querying. Legacy Context: Basic understanding or experience with PHP applications is a plus. SaaS Background: Previous experience building or scaling multi-tenant SaaS products. What We Offer Rate: 100-125 PLN/h Contract Type: B2B Contract. Duration: 6 months with a strong possibility of long-term extension.

🏢 Summary: The role focuses on designing and delivering high-complexity, scalable backend solutions in a large-scale distributed ecosystem, combining deep Kotlin expertise with AI-driven capabilities such as LLM integrations. The engineer will drive architectural decisions, ensure production-grade quality, and integrate agentic AI systems into real-world workflows. This position requires strong ownership, autonomy, and impact on systems operating at significant scale. 🗂️ Requirements: Proven experience as Senior Software Engineer in high-scale environments, Deep hands-on experience with Kotlin, Commercial experience with LLM integration, Experience with agentic systems or frameworks, Strong system design and architectural skills, Experience with scalability, performance, and reliability, Experience ensuring observability of distributed systems, Ability to manage technical debt and system risks, Experience integrating AI solutions into production systems 📃 Skills: Kotlin, LLM, AI, Agentic, Architecture, Scalability, Performance, Observability, DistributedSystems, GCP, Kubernetes 🏢 Description: Senior Software Engineer (Kotlin / AI Integration / Large-Scale Systems) We are looking for a highly experienced Senior Software Engineer to join a large-scale product ecosystem operating in a complex, distributed environment. This role is designed for a strong Individual Contributor who thrives on solving high-complexity problems, influencing architecture, and delivering scalable, production-grade solutions. You will work at the intersection of modern backend engineering and AI-driven capabilities, helping evolve systems that operate at significant scale. The ideal candidate combines deep Kotlin expertise with curiosity and practical interest in AI-powered solutions — particularly LLM integrations and agentic frameworks — and understands how to translate technical decisions into real user impact. What You’ll Be Responsible For Designing and delivering high-complexity features and system components Driving architectural decisions and evaluating technical trade-offs Ensuring quality, scalability, reliability, and observability of delivered solutions Taking end-to-end ownership of implementation, from concept to production Identifying and managing technical risks, dependencies, and technical debt Integrating AI-driven capabilities (LLMs, agentic systems) into production workflows Collaborating closely with Engineers, Product Managers, and Designers Evaluating technical decisions based on measurable user impact Operating with high autonomy and accountability in a mature engineering environment Must Have Proven experience as a Senior Software Engineer delivering complex, high-scale solutions Deep hands-on experience with Kotlin Basic commercial experience and strong interest in AI-driven solutions , especially LLM integration and Agentic Systems/Frameworks Strong architectural mindset and ability to drive system design Experience managing scalability, performance, stability, and observability Ability to identify technical debt and proactively address system risks Strong collaboration and communication skills High level of ownership and autonomy Nice to Have Experience with Cloud environments (GCP preferred) and Kubernetes Experience working with large-scale distributed systems Cross-team collaboration in complex organizational structures Providing technical consultancy and knowledge sharing within teams Advising on engineering standards and continuous optimization of development practices