Python Full Stack Developer -AI/LLM, RAG, LangChain - Contract

Greater London
Contract
Python developer
Reference: 4504pythllm_1771583609

Python Full Stack Developer (AI/LLM, RAG, LangChain, APIs) - Contract

Location: Remote (UK)
Start: ASAP
Project: AI/LLM Product Engineering - RAG + API Platform

Overview

We're hiring a hands-on Python Full Stack Developer to build and scale AI-enabled applications using LLMs, RAG, and LangChain. You'll develop production-grade APIs and end-to-end features, integrating LLM workflows into secure, reliable services and modern web interfaces.

Key Responsibilities

  • Build and maintain backend services and APIs using Python (FastAPI/Django/Flask).
  • Implement RAG pipelines (document ingestion, chunking, embeddings, retrieval) and integrate LLM workflows using LangChain.
  • Develop front-end features for AI experiences using JavaScript/TypeScript and modern frameworks (React/Next.js or similar).
  • Integrate third-party/internal APIs and manage databases (PostgreSQL/MongoDB or similar) to support AI-driven functionality.
  • Contribute to engineering best practices: code reviews, testing, performance optimisation, and production support.

Required Skills & Experience

  • Strong commercial experience building APIs in Python (FastAPI/Django/Flask) in production environments.
  • Hands-on experience delivering LLM solutions including RAG and LangChain.
  • Full stack capability with JavaScript/TypeScript and a modern UI framework (React/Next.js or similar).
  • Solid SQL skills and experience working with data stores (relational and/or NoSQL).
  • Strong delivery mindset in agile teams, with good communication and stakeholder collaboration.

Nice to Have

  • Experience with vector stores / embeddings (e.g., FAISS/Chroma/Pinecone/Azure AI Search equivalents).
  • Cloud deployment experience (AWS/Azure/GCP), containers (Docker/Kubernetes), CI/CD.
  • Experience building chat/agentic AI applications (Rasa/Botpress or custom NLP/agent workflows).

Apply Now

If you're a Python full stack engineer with real-world LLM/RAG/LangChain experience and a strong track record building APIs, apply now for immediate consideration.

GCS is acting as an Employment Business in relation to this vacancy.

COMPETITIVE SALARY

Greater London

Contract

Added 20/02/2026
Reference: 4504pythllm_1771583609

Python Full Stack Developer -AI/LLM, RAG, LangChain - Contract

Greater London
Contract

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