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

Sii Poland; Kraków; On-site; PLN 260,000 - 380,000; Full time

Benefits offered by this job

Great work environment

Medical care

Profit sharing

Training programs

Office amenities

Job summary

Sii Poland is building a new AI team in Kraków to design and deliver production-grade AI systems powered by LLMs in a regulated environment. You will work on end-to-end pipelines, retrieval, and evaluation, leveraging LangChain, LangGraph, and LlamaIndex, with a focus on robust, scalable cloud infrastructure.

The roles require 5+ years of software/AI experience, strong Python, and hands-on experience with LLM frameworks.

Qualifications

• 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.

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.

Skills

Python

LLM frameworks

Vector databases

RAG pipelines

SQL & cloud data

English fluency

Poland resident

Tools

LangChain

LangGraph

LlamaIndex

Job description

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

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