Python Engineer

Job ID: 6979Location: LondonSalary: 90,000-100,000 per yearPosted: 2026-09-28Python EngineerNcounter is working with a technology consultancy expanding its AI engineering capability across major law enforcement and public sector transformation programmes. We are looking for an experienced Python Developer who has moved beyond experimenting with Generative AI and has genuine experience engineering LLM-powered solutions for production environments.

Working within multidisciplinary consulting teams, you will help organisations explore how AI can improve complex operational processes, information discovery and decision support. You will take ideas from discovery and prototype stages into secure, reliable services, working alongside architects, consultants and frontend engineers.

What you'll be doing:

Engineer Python backend services and APIs using FastAPI and asynchronous development patternsDesign and integrate LLM capabilities using OpenAI, Azure OpenAI or comparable foundation modelsBuild practical RAG, enterprise search and document intelligence solutions using embeddings and vector databasesDevelop prompt strategies while managing production considerations including latency, cost, retries and rate limitsExplore agentic workflows and LLM orchestration using LangChain or similar frameworksWork with consultants and customer stakeholders to translate operational problems into practical AI solutionsImprove security, testing, observability and reliability across deployed applicationsWhat we're looking for:5+ years' commercial Python engineering experience, including production backend systemsStrong FastAPI, REST API, async Python, PostgreSQL and SQL experienceDemonstrable experience integrating LLMs into real applications, rather than purely personal or experimental projectsStrong Docker, Kubernetes/OpenShift, CI/CD and pytest knowledgeExperience working with large codebases and improving existing services safelyKnowledge of Azure, RAG, pgvector, Chroma, FAISS, Entra ID, OAuth/OIDC, Redis, Terraform, Prometheus or OpenTelemetry would strengthen your application.

Current or recently held SC clearance is required.

For an AI-focused Python Engineer looking to combine deep technical work with consultancy exposure and challenging public sector problems, contact Ncounter to discuss the opportunity.