AI Engineer - LLM / Agentic Systems (f/m/x)

AI Engineer – LLM / Agentic Systems (f/m/x)

Miejsce pracy: Białystok

Technologies we use

Expected

• Python
• LLM
• OpenAI
• LangChain / LangGraph / LlamaIndex
• SQL
• Pinecone / Weaviate / pgvector / OpenSearch

About the project

We are building a new AI team within a project in the digital healthcare / data-driven marketing domain. We are looking for both a Tech Lead and Senior Engineers who will work together as one cohesive team.

The role focuses on designing and delivering production-grade AI systems powered by LLMs in a real-world, regulated environment.

Your responsibilities

• Design and develop production-ready AI systems based on LLMs and agent-based workflows
• Build and maintain data pipelines for retrieval, orchestration, and evaluation
• Implement solutions using frameworks such as LangChain, LangGraph, LlamaIndex, or custom approaches
• Develop and optimize RAG pipelines (chunking, embedding, retrieval, reranking)
• Integrate LLM models (OpenAI and open-source) and support model selection decisions
• Collaborate with Data Science teams to productionize ML models
• Build evaluation frameworks (metrics, test sets, regression tests) and monitor system performance
• Create and maintain scalable AI infrastructure in a cloud environment

Our requirements

• Minimum 5 years of commercial experience in software development or AI/ML engineering
• Strong Python skills with solid software engineering practices (modular design, testing, code reviews)
• Hands-on experience with LLM frameworks such as LangChain, LangGraph, or LlamaIndex
• Experience with vector databases (e.g., Pinecone, Weaviate, pgvector, OpenSearch)
• Practical experience building RAG pipelines and working with unstructured data
• Experience working with SQL and cloud-based data systems
• Availability to start within 2 weeks due to a fast project kickoff
• Fluency in English
• Residing in Poland required

What we offer

• Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas
• Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market
• We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022
• Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more
• Comfortable workplace – class A offices or remote work
• Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application
• PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers
• Investment in your growth – meetups, webinars, training platform and technology blog – you choose
• Fantastic atmosphere created by all Sii Power People

Recruitment stages

• Send your CV
• Talk to us about your expectations
• Learn more about our projects and choose the best
• Start your adventure with Sii!

Sii Sp. z o.o.

Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment.

Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.