Python Engineer

Ncounter Limited; Greater London; On-site; GBP 70,000 - 100,000; Full time

Job summary

Ncounter Limited is expanding its AI engineering capability and seeks an experienced Python Engineer to productionize LLM-powered solutions for public sector transformation programmes. You will work in multidisciplinary teams to evolve ideas from discovery to secure, scalable services, collaborating with architects, consultants and frontend engineers.

Ideal candidates have 5+ years of commercial Python experience, strong FastAPI and PostgreSQL skills, and a track record of integrating LLMs into

Qualifications

• 5+ years' commercial Python engineering experience, including production backend systems.
• Strong FastAPI, REST API, async Python, PostgreSQL and SQL experience.
• Demonstrable experience integrating LLMs into real applications, rather than purely personal or experimental projects
• Strong Docker, Kubernetes/OpenShift, CI/CD and pytest knowledge
• Experience working with large codebases and improving existing services safely
• Knowledge 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.

Responsibilities

• Engineer Python backend services and APIs using FastAPI and asynchronous development patterns
• Design and integrate LLM capabilities using OpenAI, Azure OpenAI or comparable foundation models
• Build practical RAG, enterprise search and document intelligence solutions using embeddings and vector databases
• Develop prompt strategies while managing production considerations including latency, cost, retries and rate limits
• Explore agentic workflows and LLM orchestration using LangChain or similar frameworks
• Work with consultants and customer stakeholders to translate operational problems into practical AI solutions
• Improve security, testing, observability and reliability across deployed applications

Skills

Python

FastAPI

REST API

Async Python

PostgreSQL

Docker

Kubernetes/OpenShift

CI/CD

pytest

LLM integration

Tools

Docker

Kubernetes/OpenShift

Redis

Terraform

Prometheus/OpenTelemetry

pgvector

Chroma

FAISS

Job description

Python Engineer

Ncounter 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 patterns
• Design and integrate LLM capabilities using OpenAI, Azure OpenAI or comparable foundation models
• Build practical RAG, enterprise search and document intelligence solutions using embeddings and vector databases
• Develop prompt strategies while managing production considerations including latency, cost, retries and rate limits
• Explore agentic workflows and LLM orchestration using LangChain or similar frameworks
• Work with consultants and customer stakeholders to translate operational problems into practical AI solutions
• Improve security, testing, observability and reliability across deployed applications

What we're looking for:

• 5+ years' commercial Python engineering experience, including production backend systems
• Strong FastAPI, REST API, async Python, PostgreSQL and SQL experience
• Demonstrable experience integrating LLMs into real applications, rather than purely personal or experimental projects
• Strong Docker, Kubernetes/OpenShift, CI/CD and pytest knowledge
• Experience working with large codebases and improving existing services safely
• Knowledge 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.