Mid-Level Python AI Engineer: LLM, RAG & Knowledge Graph

Sigma Software; Województwo mazowieckie; On-site; PLN 150,000 - 230,000; Full time

Job summary

Sigma Software is seeking a software professional to join one of two AI initiatives: ChatCPI, an LLM-powered assistant for intelligent search over large technical documentation, or a Knowledge Graph Platform for structuring enterprise information for AI-driven use cases.

Technologies include Python, LLMs, RAG, vector embeddings, hybrid search, and knowledge graphs. You will design and implement LLM-based features, build retrieval pipelines, and take ownership from design to deployment.

Qualifications

• 3+ years of commercial software development experience.
• 2+ years of experience working on AI/ML projects.
• Good Python skills with hands-on implementation experience.
• Practical experience with LLMs and modern AI technologies.
• Practical experience with RAG architecture, vector embeddings, and hybrid search.
• Experience with information processing aimed at improving AI quality, including data preparation, chunking, metadata enrichment, and relevance tuning.
• Ability to work independently and take ownership of tasks from design through deployment.
• Upper-Intermediate English.

Responsibilities

• Design and implement LLM-based features and RAG pipelines from data ingestion to answer generation
• Build and optimize retrieval using vector embeddings and hybrid semantic and keyword search
• Process, clean, and structure source information to improve the accuracy and relevance of AI-generated output
• Evaluate model quality, experiment with new approaches, and bring proven solutions into production
• Work closely with the team to integrate AI components into the wider platform
• Own changes end-to-end, including design, implementation, testing, and deployment
• Work independently while proactively communicating blockers, scope questions, and technical trade-offs

Skills

Software development

AI/ML projects

Python

LLMs

RAG

Vector embeddings

Hybrid search

Data processing

Metadata enrichment

Relevance tuning

Independent work

Ownership

English proficiency

Tools

Graph databases

Job description

Sigma Software is seeking a software professional to join one of two AI initiatives: ChatCPI, an LLM-powered assistant for intelligent search over large technical documentation, or a Knowledge Graph Platform for structuring enterprise information for AI-driven use cases.

Technologies include Python, LLMs, RAG, vector embeddings, hybrid search, and knowledge graphs. You will design and implement LLM-based features, build retrieval pipelines, and take ownership from design to deployment.