Python Engineer

Ncounter Limited; City Of London; On-site; GBP 70,000 - 110,000; Full time

Job summary

Ncounter Limited is seeking a Python Engineer to join its AI engineering capability, helping public sector clients by turning ideas from discovery into reliable, scalable production services. The role focuses on building robust backends, APIs, and LLM-powered features using modern tooling.

You will work in multidisciplinary teams to design production-grade Python applications, leveraging FastAPI, async patterns, and vector-based document intelligence, while collaborating with consultants and

Qualifications

• 5+ years' commercial Python engineering experience, including production backend systems.
• Demonstrable experience integrating LLMs into real applications, not just experiments.
• Strong Docker, Kubernetes/OpenShift, CI/CD and pytest knowledge; experience with large codebases.

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 development

FastAPI

Async Python

LLM integration

REST APIs

PostgreSQL

CI/CD

pytest

LangChain

Tools

Docker

Kubernetes/OpenShift

Redis

pgvector

Chroma

FAISS

Terraform

Prometheus/OpenTelemetry

OAuth/OIDC

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 knowledgeExperience 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.