> Markdown version of [/jobs/ext/333363-senior-net-developer](https://www.wearedevelopers.com/jobs/ext/333363-senior-net-developer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior .Net Developer - **Company:** Farrell Heyworth - **Location:** Lancaster, UK - **Experience:** Expert - **Salary:** £45,000.0 - £65,000.0 - **Contract:** Permanent contract - **Skills:** ASP.NET, JavaScript (Programming Language), .NET Framework, Application Programming Interfaces (APIs), Microsoft Azure, C Sharp (Programming Language), Software Debugging, Microsoft Visual Studio, Microsoft SQL Server, Model View Controller (MVC), Systems Architecture, Systems Integration, Microsoft Power Automate, ReactJS, Reliability of Systems, Git, AngularJS, Information Technology, Web Technologies, Front End Software Development, Api Design, Webhooks, Software Version Control, Powerapps, Legacy Systems - **Published:** June 7, 2026 - **Apply:** https://uk.indeed.com/viewjob?jk=6bc2cf358ff00447 ## About the Role Do you have experience in Visual Studio?, * 5+ years development experience * Strong SQL Server knowledge (queries, performance, debugging) * Strong C# programming skills * Experience working with Classic ASP / legacy web technologies * Strong debugging and troubleshooting skills * Experience working with APIs and integrations * Strong understanding of how systems interact across a full stack environment * Experience using source control tools (Git) * Experience working in Visual Studio or similar environments Ideally but not essential * Experience with ASP.NET (Web Forms / MVC / Razor) * Experience with JavaScript / HTML / CSS * Familiarity with Microsoft Power Platform (Power Apps / Power Automate) * Experience with Azure (Functions, integrations) * Experience with modern front-end frameworks (Angular / React) * Understanding of system architecture and design patterns, * Someone experienced in working with complex legacy systems * Strong ownership mentality for system stability * Ability to quickly understand and navigate unfamiliar codebases * Pragmatic approach to problem solving and delivery * Someone who can balance maintenance with improvement ## Description If you're in sync with all our core values, we'd be excited to hear from you! * Trustworthy & Fair * Honest & Transparent * Reliable & Loyal * Authentic * Relentless & hardworking Our group mission and strategy statement 'To be the property experts of choice, achieving the best outcome for our clients and exceeding their expectations through our passionate, professional and committed teams.', We are looking for a Senior IT Developer to join our IT development team in Lancaster City Centre. This role is focused on maintaining, supporting, and improving a complex business-critical system built across a mixed technology stack. The successful candidate will play a key role in ensuring system reliability, resolving issues, and supporting ongoing development as we transition to newer platforms., We are looking for a senior developer who will: * Maintain and support a legacy system built using Classic ASP, C#, and SQL Server * Diagnose and resolve issues in a live production environment * Develop and maintain integrations with third-party systems (APIs / Webhooks) * Support ongoing improvements and enhancements across the system * Work across both front-end and back-end codebases where needed * Assist with documentation and knowledge sharing * Support transition towards modern platforms where appropriate ## Related Videos - [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) - [Watch Tests Go Brrrr! : Getting Started with Cypress in ReactJS](https://www.wearedevelopers.com/videos/282-watch-tests-go-brrrr-getting-started-with-cypress-in-reactjs) - [How a Small Team Shrank a Microsoft Monorepo by 94%](https://www.wearedevelopers.com/videos/1236-how-a-small-team-shrank-a-microsoft-monorepo-by-94) - [Web development best practices in 2021](https://www.wearedevelopers.com/videos/280-web-development-best-practices-in-2021) - [Why you must use TDD now!](https://www.wearedevelopers.com/videos/114-why-you-must-use-tdd-now) - [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) ## Related Articles - [Frontend Developer Salary in The UK](https://www.wearedevelopers.com/magazine/233-frontend-developer-salary-in-the-uk) - [Fullstack Developer Salary UK](https://www.wearedevelopers.com/magazine/251-fullstack-developer-salary-uk) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [What’s the Difference between a Junior, Mid, and Senior Developer?](https://www.wearedevelopers.com/magazine/238-what-s-the-difference-between-a-junior-mid-and-senior-developer) - [The Most Popular IT Jobs on the Market](https://www.wearedevelopers.com/magazine/376-the-most-popular-it-jobs-on-the-market) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated)