Senior .NET Engineer

Senior .NET Software Engineer (TDD & Agentic AI Workflows) | Up to £80,000 | London I'm recruiting on behalf of a well-established UK insurance broker (17 years in business, freshly invested in to grow into new markets) who need a brilliant .NET engineer to join as their second senior hire. The mission: drive proper test-driven development and strong unit-testing practices across the team, then use that foundation to build an agentic AI workflow - where engineers write clear requirements and tests, and AI agents handle implementation, raising pull requests the team can actually trust. You'd still be hands-on, building and maintaining core software alongside leading this initiative. What you'll be doing: • Championing TDD and unit-testing best practice across the team • Designing and rolling out an agentic AI workflow, including server-side AI code review and quality checks wired into CI/CD and GitHub • Analysing existing codebases for risks and improvement opportunities • Working with stakeholders to translate business needs into technical solutions • Deploying to AWS with a focus on scalability, security and reliability • Writing clean, well-tested, well-documented code • Supporting monitoring, alerting and production troubleshooting What's on offer: • 20 days' holiday, rising to 25 with service • Genuine influence over engineering culture and practices from an early stage • A close-knit team spanning the UK and India Location: London (hybrid/occasional WFH) Level: Senior - second engineering hire Oscar Associates (UK) Limited is acting as an Employment Agency in relation to this vacancy. To understand more about what we do with your data please review our privacy policy in the privacy section of the Oscar website.