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Offer summary
(Summary generated by AI based on the full job description)
The project focuses on building production-grade AI systems based on LLMs within digital healthcare and data-driven marketing. Key technologies include Python, LangChain, LangGraph, LlamaIndex, Pinecone, Weaviate, SQL, and cloud infrastructure. Responsibilities involve designing AI systems, building and optimizing RAG pipelines, integrating LLM models (OpenAI, open-source), collaborating with Data Science teams, and monitoring system performance. A minimum of 5 years experience in AI/ML and working with unstructured data is required.
AI Engineer – LLM / Agentic Systems (f/m/x)
Company: Sii Sp. z o.o.
from: 11 June 2026
to: 11 July 2026
salary not specifiedB2B contract (full-time)
salary not specifiedcontract of employment
Offer parameters
level:senior
working mode:remote • hybrid • full office
Białystok, Centrum
Requirements
Expected technologies
Python
LLM
OpenAI
LangChain / LangGraph / LlamaIndex
SQL
Pinecone / Weaviate / pgvector / OpenSearch
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
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
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.
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
- 1.Send your CV
- 2.Talk to us about your expectations
- 3.Learn more about our projects and choose the best
- 4.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.
This is how we work
AI Engineer – LLM / Agentic Systems (f/m/x)
I apply to:
Sii Sp. z o.o.
Białystok, Centrum
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