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Sigma Software

Middle Python Developer (ML)

Sigma Software Warsaw, Masovian Voivodeship, Poland

Software Development · 1,001-5,000 employees

12 h ago
python Mid (2-5 yrs) Full-time Poland
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About the role

Design and implement LLM-based features and RAG pipelines while optimizing retrieval using vector embeddings and hybrid search. You will also process and structure source information to improve AI output quality and integrate these components into the platform.

What they look for

Python LLMs RAG Vector Embeddings Hybrid Search Knowledge Graphs Data Ingestion Semantic Search Keyword Search Data Cleaning Model Evaluation Deployment Graph Databases Metadata Enrichment Chunking

Requirements

Requires 3+ years of commercial software development experience with at least 2 years focused on AI/ML projects. Candidates must have strong Python skills and practical experience with RAG architecture, LLMs, and modern AI technologies.

Full description

Company Description

You will join one of two AI initiatives: ChatCPI, an LLM-powered assistant for intelligent search and question answering over large technical documentation, or a Knowledge Graph Platform focused on structuring and connecting enterprise information for AI-driven use cases.

CUSTOMER

Our Customer is a leading Swedish telecommunications company recognized for delivering innovative large-scale technology solutions across complex infrastructure environments. The company operates internationally, serving millions of users and working with global technology leaders to drive digital transformation in the telecommunications industry.

PROJECT

You will join one of two AI initiatives: ChatCPI, an LLM-powered assistant for intelligent search and question answering over large technical documentation, or a Knowledge Graph Platform focused on structuring and connecting enterprise information for AI-driven use cases.

Technologies: Python, LLMs, RAG, vector embeddings, hybrid search, knowledge graphs.

Job Description

  • 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

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

WILL BE A PLUS

  • Experience with knowledge graphs or graph databases
  • Background in the telecommunications domain

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