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 tasks

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

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

Job no. 260611-YOT4F

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

Benefits For You

Great Place to Work

Solid financial situation

Contracts with the biggest brands

Centre of internal trainings

Many experts you can learn from

Open and accessible management team

Profit sharing

Passion Sponsorship program

Regular integration events and trips

Comfortable and well-equipped offices

MySii app

Medical care