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Salary
≈ $62k – $103k per year (Estimated)
Location
Hybrid (Gdańsk, Warsaw, Wrocław, Kraków, Poland)
Seniority
Senior
Employment
Contractor

First seen by Alion on Oct 27, 2026. Billennium scores A on the Alion truth index.

Overview
Company
Impact
Profile match
Billennium is an international IT services and software development company specializing in cloud solutions, enterprise application development, and digital transformation. Headquartered in Poland with global delivery centers, the company provides end-to-end technology services, managed IT, and staff augmentation to enterprise clients worldwide. By partnering with leading cloud platforms like AWS, Microsoft, and Salesforce, Billennium helps organizations optimize their digital infrastructure and streamline business operations.

About the Client

We are seeking experienced Senior GenAI Engineer – Python and cloud-native application development. In this role, you will design, build, and optimize scalable backend systems that power AI-driven and intelligent automation solutions in the cloud.

What you will do

  • Build LLM-powered features end to end. Design and implement agentic flows, retrieval, and tool calling using LangGraph — then ship them as FastAPI services with streaming, persistence and proper tests.

  • Own answer quality. Build evaluation datasets, regression suites and LLM-as-judge checks so we know whether a prompt or model change made things better before it reaches users.

  • Get the right context to the model. Turn user questions into effective queries against our search platform, orchestrate multi-step research loops, and shape the context the model reasons over. When an answer is wrong, work out whether retrieval, the query or the prompt is at fault — and fix the right one.

  • Debug production. Instrument flows with tracing (Langfuse), investigate bad answers from real traces, and manage latency, token and cost budgets — including routing across model sizes and families behind an AI gateway.

What we are looking for:

  • Strong proficiency in Python for backend development (FastAPI, Flask, Django, or similar frameworks).

  • Deep understanding of software architecture, design patterns, and API development.

  • Solid experience with Azure cloud services, including containerization (Docker, Kubernetes), storage, and serverless technologies.

  • Familiarity with CI/CD pipelines, infrastructure-as-code (Terraform, Bicep, ARM), and monitoring tools (App Insights, Prometheus, Grafana).

  • General interest and experience with AI-driven applications, and automation

  • Hands-on experience or strong understanding of AI-driven systems and intelligent automation workflows.

  • Know how to work with LLM use API and know how their are tested, know what RAG is, LangGraph and other tools like that experience.

  • Ability to apply prompt engineering and integrate machine learning or LLM APIs effectively.

  • Proven track record in system build, scalability and performance optimization.

  • Experience in code reviews, mentoring and setting engineering standards.

  • Strong problem-solving skills, analytical thinking, and technical decision-making.

  • Fluent in English, proactive communicator, and a collaborative team player.

  • Open-minded, creative, and motivated to push boundaries in AI and automation.

Perks and benefits

  • Comprehensive benefits: Udemy for Business, private medical care, Multisport card, veterinary package, language lessons and shopping vouchers.

  • Flexibility: adaptable working hours and remote or hybrid work options to suit your lifestyle and location.

  • Career growth: professional development opportunities and access to benefits resulting from partnerships with Microsoft, AWS, Snowflake, Salesforce and other global technology companies.

  • Global collaboration: cooperation with a diverse, international team.

  • Innovative environment: an opportunity to help shape modern AI and intelligent automation solutions.

  • Engaging community: team-building events, hackathons and CSR initiatives.

  • An annual company event in Mazury.

  • A welcome pack to start your journey with us.

Tech stack

  • Python
  • AI
  • Azure
  • LLM
  • RAG
  • Langgraph
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