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Offer summary
(Summary generated by AI based on the full job description)
The project focuses on artificial intelligence in digital healthcare and data-driven marketing. Core technologies include Python, LLM frameworks like LangChain, LangGraph, LlamaIndex and vector databases such as Pinecone, Weaviate, pgvector, OpenSearch. Responsibilities cover designing and delivering LLM-based AI systems, building and optimizing RAG pipelines, integrating LLM models and collaborating with Data Science teams to productionize ML models. Experience with unstructured data and cloud systems is required.
AI Engineer – LLM / Agentic Systems (f/m/x)
Company: Sii Sp. z o.o.
from: 13 July 2026
to: 12 August 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
SQL
LangChain
LangGraph
LlamaInde
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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