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Middle Python Developer (ML)

Sigma Software · Warsaw, Masovian Voivodeship, Poland · Remote

  • Software & SaaS
  • 1,001–5,000 employees
  • London

Strong hiring record · median 38 days open

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Middle Python Developer (ML) at Sigma Software. We’ll keep it in your applied jobs, so you can see it later and be warned before applying to the same employer twice.

  • 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
  • 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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