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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior .NET Backend Developer - **Company:** Optix - **Location:** Nether Poppleton, UK (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Clean Code Principles, ASP.NET, .NET Framework, Application Programming Interfaces (APIs), Artificial Intelligence, User Authentication, Automation of Tests, C Sharp (Programming Language), Continuous Integration, Data Governance, Relational Databases, Dependency Injection, Programming Tools, Elasticsearch, PostgreSQL, RabbitMQ, Redis, Prometheus, Software Engineering, SQL Databases, Systems Integration, Web Services, Windows Desktop, Windows Forms, Datadog, Grafana, Backend, Kubernetes, Graphql, Code Restructuring, Web Architecture, Docker, Microservices - **Published:** September 2, 2026 - **Apply:** https://uk.indeed.com/viewjob?jk=cac203a72ab6b7ad ## About the Role * Strong experience designing and operating production APIs and services with C#, modern .NET and ASP.NET Core. * Proven architectural judgement across service boundaries, data ownership, integrations, scalability, resilience and maintainability. * Experience with SQL, relational databases and safely evolving data-intensive backend systems. * A strong approach to software design, dependency injection, automated testing and maintainable code. * Ability to understand large or unfamiliar codebases and translate complex existing behaviour into a clear technical approach. * A disciplined approach to AI-assisted development, including context management, task decomposition, security, testing, review and validation. * Proven experience leading engineers through architectural or tooling change by setting direction, documenting decisions and coaching others. * Strong communication and stakeholder-management skills, with the ability to explain decisions clearly and challenge constructively. Useful experience - not essential * Experience using AI coding assistants or agents in day-to-day software delivery. * Kubernetes and Docker experience, if in production even better. * Authentication and authorisation platforms, and software handling sensitive or clinically important data. * PostgreSQL, Redis, Elasticsearch or other data and caching technologies. * GraphQL, including schema design and gateway patterns. * Grafana, OpenTelemetry, Prometheus or equivalent observability tooling. * CI/CD, production services, microservices and message-driven systems such as RabbitMQ. ## Description Optix is modernising a large, established Windows desktop platform into a modern web product. We are looking for a senior .NET backend developer with deep engineering experience, strong architectural judgement and a practical approach to modern development tools. This is a hands-on role with significant responsibility for backend architecture and delivery. You will design .NET services and APIs, turn complex legacy behaviour into maintainable solutions, and help improve engineering practices across the team. What you'll be doing * Design and implement complex backend functionality using C# and modern .NET / ASP.NET Core. * Make and communicate pragmatic architectural decisions across services, APIs, data and integrations. * Modernise functionality from our established WinForms application into a maintainable service-based web architecture. * Work with engineers, Product and technical stakeholders to shape solutions and clarify trade-offs. * Lead by example. Use AI tools and coding agents across code exploration, design, implementation, testing, review, refactoring, documentation and migration, while retaining clear ownership of the outcome. * Set a high standard for maintainability, automated testing, security, observability and pull-request review. * Investigate complex technical and production issues and drive them through to resolution. ## Related Videos - [Shipping Faster with Less: Render on Cloud Hosting, AI Workloads, and the Future of DevOps](https://www.wearedevelopers.com/videos/1894-shipping-faster-with-less-render-on-cloud-hosting-ai-workloads-and-the-future-of-devops) - [Building Multi-Tenant ASP.NET Core Applications: Best Practices and Real-World Solutions](https://www.wearedevelopers.com/videos/1552-building-multi-tenant-asp-net-core-applications-best-practices-and-real-world-solutions) - [Docker Compose: Rediscovered](https://www.wearedevelopers.com/videos/1978-docker-compose-rediscovered) - [Reducing LLM Calls with Vector Search Patterns - Raphael De Lio (Redis)](https://www.wearedevelopers.com/videos/1714-reducing-llm-calls-with-vector-search-patterns-raphael-de-lio-redis) - [Developing ASP.NET Core Microservices with Dapr: A practical guide](https://www.wearedevelopers.com/videos/1528-developing-asp-net-core-microservices-with-dapr-a-practical-guide) - [Build and Deploy a Fullstack App with Open Source Tooling](https://www.wearedevelopers.com/videos/775-build-and-deploy-a-fullstack-app-with-open-source-tooling) ## Related Articles - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Frontend Developer Salary in The UK](https://www.wearedevelopers.com/magazine/233-frontend-developer-salary-in-the-uk) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated)