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# Senior Product Engineer - C#/.NET & AI

- **Company:** djr
- **Location:** Newcastle upon Tyne, UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** .NET Framework, Artificial Intelligence, C Sharp (Programming Language), Data Logging, Large Language Models
- **Published:** September 8, 2026
- **Apply:** https://www.collegerecruiter.com/job/2842194092-senior-product-engineer--cnet--ai

## About the Role

First and foremost, you need to be a strong commercial C#/.NET Software Engineer.

Alongside this, we're looking for genuine hands-on experience building with Large Language Models professionally - not simply personal projects or online courses.

Ideally you'll demonstrate:

 * Experience working within established, business-critical codebases
 * Commercial LLM integration
 * Prompt and context engineering
 * Structured AI outputs
 * Testing/evaluation of LLM responses
 * Strong software engineering fundamentals
 * Experience taking ideas from prototype through to production
 * Daily use of AI-assisted development tools

Experience with RAG, agentic workflows, tool calling, vector databases, embeddings or multiple LLM providers would be particularly valuable.

## Description

* Build and ship AI-powered features within established C#/.NET products
 * Design prompts, context strategies and structured LLM outputs
 * Integrate commercial LLM APIs into production software
 * Prototype rapidly and turn successful concepts into robust functionality
 * Build evaluation into features from the outset
 * Manage accuracy, latency, token costs, fallbacks and failure scenarios
 * Implement appropriate logging and monitoring
 * Work alongside Software Engineers, Product Managers and domain specialists
 * Evaluate different models and providers based on quality, cost and performance
 * Help establish Applied AI engineering standards across the wider organisation


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