New offer - be the first one to apply!

July 20, 2026

Data/AI Engineer

Mid • Remote

Warsaw, Poland

Role Purpose

We are looking for a Data / AI Engineer to build and own the upstream data pipelines that prepare large volumes of documents and business data for AI-powered applications. You will transform diverse, complex data sources into structured, high-quality datasets ready for analytics, retrieval-augmented generation (RAG), and large language model (LLM) workflows. You will ensure that information is consistently collected, cleaned, enriched, processed, and made available for intelligent search and AI-driven solutions. You will work closely with data scientists and AI engineers to enable reliable, scalable, and production-ready data foundations.

Key Responsibilities

  • Own end-to-end data flows from raw documents and source systems to structured data, embeddings, and searchable data stores
  • Build and maintain ETL/ELT pipelines for extracting, transforming, and loading data
  • Ingest and process data from multiple internal and external sources
  • Extract metadata and structure unstructured documents for AI and analytics use cases
  • Clean, normalize, and prepare large document collections for LLM and RAG applications
  • Develop automated pipelines for document processing, chunking, embedding generation, and indexing
  • Ensure data quality, consistency, versioning, and pipeline reliability
  • Support the development and optimization of AI solutions using embeddings, vector search, semantic search, and retrieval techniques
  • Help design scalable data architectures for growing data volumes
  • Collaborate with data scientists, engineers, and business stakeholders to deliver data-driven capabilities

Required Skills & Experience

  • Strong Python skills, including experience with data processing libraries such as pandas
  • Strong SQL skills and experience working with structured data
  • Experience building ETL/ELT pipelines and data processing workflows
  • Experience working with document processing and unstructured data
  • Familiarity with Docker and modern data platforms or warehouses
  • Experience working with databases such as Snowflake, MongoDB, or similar technologies
  • Understanding of data modelling principles and data preparation techniques
  • Analytical mindset with strong attention to detail
  • Ability to work effectively with messy, evolving, and complex data sources
  • Clear, direct, and collaborative communication style

Nice to Have

  • Experience with OCR technologies and document extraction
  • Experience with MongoDB Atlas or similar platforms
  • Basic understanding of embeddings, RAG architectures, vector databases, and semantic search
  • Experience supporting AI or machine learning projects

Perks and Benefits

  • Comprehensive benefits including Udemy for Business, private medical care, Multisport card, veterinary package, language lessons, and shopping vouchers
  • Flexible working hours and remote/hybrid work options
  • Professional development and learning opportunities
  • Access to partnerships with Microsoft, AWS, Snowflake, Salesforce, and more
  • International team collaboration
  • Innovative and growth-oriented work environment
  • Participation in team-building events, hackathons, and CSR initiatives
  • Annual company event in Mazury
  • Welcome pack for new employees

Recruitment Process

  • HR call
  • Technical Interview
  • Interview with the dedicated Client
  • Final decision and feedback

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Healthcare

Billennium

Senior Java Developer

Senior

Remote

Warsaw, Poland

🏢 Summary: Senior Java Developer role focused on building and maintaining full‑stack healthcare applications that support oncology diagnosis and treatment. The position involves designing scalable, secure microservices-based systems, contributing to architecture, and working with cloud-native and DevOps environments. The goal is to deliver high-quality digital solutions that improve patient outcomes through advanced data and analytics capabilities. 🗂️ Requirements: 5+ years of software development experience, Degree in Engineering, B2+ English proficiency, Expert knowledge of Java, Experience with Spring Boot, Experience with Hibernate/JPA, Experience designing RESTful APIs, Understanding of microservices architecture, Knowledge of event-driven and distributed systems, Strong SQL database knowledge, Experience with AWS services (EKS, S3, DynamoDB, ElastiCache, Lambda), Experience with Docker and Kubernetes, Experience with AI coding assistants and LLMs, Experience building reusable architectural components 📃 Skills: Java, Spring, SpringBoot, Hibernate, JPA, REST, Microservices, SQL, AWS, EKS, S3, DynamoDB, ElastiCache, Lambda, Docker, Kubernetes, LLM, AI, DevOps 🏢 Description: Billennium is a global technology company with over 20 years of experience, committed to innovation and empowering businesses. As an employer, we offer a supportive, growth-focused environment where collaboration and creativity thrive. Join us to shape the future of technology together! We are looking for an experienced Senior Java Developer to join a team building advanced digital solutions that support the diagnosis and treatment of oncology patients. Our mission is to improve patient outcomes by combining modern technologies with the healthcare domain. You will work on a suite of products designed to streamline medical case coordination, enable efficient data ingestion and management, provide a holistic view of the patient journey, and deliver analytics and reporting capabilities that help make treatment more effective. What you will do Design, develop, and maintain full‑stack features across a complex ecosystem of healthcare‑focused applications. Collaborate with cross‑functional teams to deliver scalable, secure, and high‑quality solutions. Contribute to architectural decisions and technical strategy. Ensure code quality through testing, reviews, and adherence to engineering best practices. Work with cloud‑native infrastructure and modern DevOps tooling. Support continuous improvement of development processes and system reliability. What we are looking for 5+ years of hands-on software development experience with a proven track record of delivering scalable systems Degree in an Engineering discipline, B2+ English, and a collaborative spirit for mentoring and team-building Expert knowledge of Java (latest versions), Spring Boot, Hibernate/JPA, and RESTful API design AI-First Mindset: proficiency in using AI coding assistants and LLMs for software development Deep understanding of microservices, event-driven patterns (Async), and distributed systems Excellent knowledge of SQL databases Strong experience with AWS (EKS, S3, DynamoDB, ElastiCache, Lambda) and modern Docker/K8s workflows Experience developing reusable architectural components for multiple projects Perks and benefits (our offer) Comprehensive benefits - enjoy Udemy for Business, private medical care, Multisport card, veterinary package, language lessons, and shopping vouchers. Flexibility - adaptable working hours and remote/hybrid work options to suit your lifestyle & location. Career growth - access opportunities for professional development and learning, including perks related to our official partnerships with global IT giants: Microsoft, AWS, Snowflake, Salesforce & more. Global collaboration - work with a diverse, international team. Innovative environment - be part of a forward-thinking and growth-oriented workplace. Engaging community – Work with passionate professionals and participate in team-building events, hackathons, and CSR initiatives to make an impact beyond work. Team-building events including our company tradition (annual company event in Mazury). A pleasant surprise to start your journey with us in the form of a welcome pack. Recruitment process: HR call Technical Interview Interview with the dedicated Client Final decision/ Feedback Sounds interesting? Click "Apply" and have a chance to hear more!

Healthcare

Billennium

Rust Tech Lead

Senior

Remote

Warsaw, Poland

🏢 Summary: Technical leadership role for a Rust Tech Lead in a SAFe Agile environment, focused on developing and architecting a Helix Data Manager for a molecular diagnostic instrument. The position involves setting coding standards, guiding architecture decisions, and ensuring high-quality, test-driven delivery within short Agile cycles. The role combines hands-on Rust development, system integration, and leadership of cross-functional engineering teams. 🗂️ Requirements: Experience in technical leadership role, Advanced proficiency in Rust, Strong experience with React and web development, Expertise in API design and system integration, Proficiency in Kubernetes, Solid understanding of design patterns, Advanced knowledge of algorithms, Experience in Domain Driven Design (DDD), Knowledge of event sourcing architectures, Hands-on experience with AI coding tools (Claude Code, Cursor, Codex), Expertise in automated testing (UI and integration), Experience working in SAFe Agile environment 📃 Skills: Rust, React, API, Kubernetes, DDD, TDD, BDD, WebAssembly, EventStore, Algorithms, AI, Claude, Cursor, Codex, CI 🏢 Description: Billennium is a global technology company with over 20 years of experience, committed to innovation and empowering businesses. As an employer, we offer a supportive, growth-focused environment where collaboration and creativity thrive. Join us to shape the future of technology together! About the Client We are seeking a highly experienced Rust Tech Lead to join our SAFe Agile team developing a Helix Data Manager for a new molecular diagnostic instrument. The Role as the Tech Lead, you will act as a senior member of the core leadership alongside the Scrum Master and Product Owner. You will guide a cross-functional team of software engineers and testers, working closely with engineers and architects to deliver working, tested software in short cycles. You will set technical standards and ensure they are met and develop according to QMS process. What you will do: Establish, maintain, and champion coding guidelines, architectural principles, and engineering best practices across the Rust development team. Collaborate directly with architects to shape and refine the system architecture, ensuring technical alignment and scalability across the Agile Release Train (ART). Ensure all code strictly follows technical standards and system architecture. Participate in Program Increment (PI) Planning every 8-12 weeks to estimate capacity, draft plans, identify dependencies, and commit to objectives. Lead execution during 2-week iterations, including iteration planning, daily stand-ups, backlog refinement, and reviews. Drive "Built-In Quality" by implementing test-first practices (TDD/BDD), peer code reviews, and robust automated regression tests. Manage continuous integration with other ART teams to prevent integration bottlenecks and support bi-weekly system demos. Drive continuous improvement. What we are looking for: Experience in technical leadership role. Advanced proficiency in RUST (Rust Foundation / Rust Advance). Strong experience with React and web development. Expertise in API Design & system integration. Proficiency in Kubernetes. Solid understanding of design patterns. Advanced knowledge of algorithm programming. Experience in Domain Driven Design (DDD). Knowledge of event sourcing architectures. Hands-on experience using AI tools for daily work like Claude Code, Cursor, Codex. Expertise in automated testing, covering UI and integration testing between backend and frontend. Nice to have skills: Experience with Event Store. Experience building web application in WebAssembly. Certification in the SAFe Agile Framework (e.g., SAFe agile software engineering, SAFe for Architects, or SAFe practitioner. English proficiency on C1+ level. Collaborative, alignment-seeking, and deeply curious about the full product. Highly effective communication skills with the ability to advocate for technical standards. Perks and benefits: Comprehensive benefits - enjoy Udemy for Business, private medical care, Multisport card, veterinary package, language lessons, and shopping vouchers. Flexibility - adaptable working hours and remote/hybrid work options to suit your lifestyle & location. Career growth - access opportunities for professional development and learning, including perks related to our official partnerships with global IT giants: Microsoft, AWS, Snowflake, Salesforce & more. Global collaboration - work with a diverse, international team. Innovative environment - be part of a forward-thinking and growth-oriented workplace. Engaging community – Work with passionate professionals and participate in team-building events, hackathons, and CSR initiatives to make an impact beyond work. Team-building events including our company tradition (annual company event in Mazury). A pleasant surprise to start your journey with us in the form of a welcome pack. Sounds interesting? Click "Apply" and have a chance to hear more!