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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Software Engineer - C# / .NET - **Company:** Lorien - **Location:** London, UK - **Experience:** Expert - **Salary:** £60,000.0 - £70,000.0 - **Contract:** Permanent contract - **Skills:** Clean Code Principles, ASP.NET, HTML, JavaScript (Programming Language), .NET Framework, Microsoft Windows, JIRA, Unit Testing, C Sharp (Programming Language), C++ (Programming Language), Cascading Style Sheets (CSS), Cloud Computing, Software Quality, Code Review, Continuous Integration, Software Debugging, DevOps, Github, Design of User Interfaces, Web Browsers, Python (Programming Language), Microsoft SQL Server, Object-Oriented Software Development, Software Architecture, Standard Sql, Software Engineering, SQL Databases, Website Wireframe, Software Modules, Data Layers, Vba Programming Language, Jenkins - **Published:** September 3, 2026 - **Apply:** https://www.adzuna.co.uk/jobs/details/5868767221 ## About the Role * Strong commercial record of full-stack software development across web and Windows applications * Strong skills across C# / .NET, ASP.NET, JavaScript, HTML, CSS and SQL Server * Experience developing software for Windows, multiple browsers and mobile-supported environments * Good understanding of software architecture, object-oriented design, maintainable coding practices and software engineering principles * Comfort working across UI, application, integration and data layers * Ability to analyse requirements, propose technical solutions and communicate clearly with technical and non-technical stakeholders * Exposure to Python, C/C++, VB or SQL is desirable * Experience with unit and component testing for software modules is desirable * Experience with automated build or CI/CD processes is desirable * Experience with cloud-based deployment, automation, staging or testing is desirable * Familiarity with Jenkins, GitHub, Jira or similar tooling is desirable ## Description * Develop and enhance features for a key software solution managing client-side data from any browser, on-premises or in the cloud, using C#, .NET, ASP.NET, JavaScript, HTML, CSS and SQL Server * Analyse technical requirements and translate them into clear, testable software tasks and specifications * Design, implement and maintain new software features, ensuring solutions are scalable, reusable, maintainable and aligned with functional and non-functional requirements * Define and integrate interfaces between internal and external systems, collaborating with other technical teams to agree robust specifications * Contribute to user-facing application development, including process flows, information architecture, wireframes and usability-focused interface delivery * Follow coding standards and ensure code is integrated frequently into automated build and continuous integration processes * Write and maintain unit tests, investigate test failures and support automated verification activities where required * Debug, troubleshoot and diagnose performance, integration and functional issues across development, test and production environments * Review code produced by other engineers, identifying design or implementation issues and helping maintain high software quality * Mentor junior engineers and promote best practice in software design, development, testing and maintainability * Work closely with product, development, automation and DevOps teams to support high-quality software delivery Technologies: * ASP.NET * C# * CI/CD * Cloud * CSS * DevOps * GitHub * Support * JIRA * JavaScript * Jenkins * Mobile * Python * SQL * Web * Windows * UX UI Design, We are a supportive, award-winning organisation with a growing product line that is making a significant difference globally. This is a senior hands-on development role based near Edinburgh, with hybrid working, flexible start and finish times, a generous bonus scheme, annual salary reviews, and strong opportunities to upskill and progress professionally. We also offer a range of additional benefits designed with employee happiness in mind. ## Related Videos - [Navigating the Corporate Jungle: Life as a Developer in a large Company](https://www.wearedevelopers.com/videos/621-navigating-the-corporate-jungle-life-as-a-developer-in-a-large-company) - [The Resilience of the World Wide Web](https://www.wearedevelopers.com/videos/1281-the-resilience-of-the-world-wide-web) - [Improving quality with Agentic AI with Rovo Dev and Xray](https://www.wearedevelopers.com/videos/2005-improving-quality-with-agentic-ai-with-rovo-dev-and-xray) - [Innovating Developer Tools with AI: Insights from GitHub Next](https://www.wearedevelopers.com/videos/1268-innovating-developer-tools-with-ai-insights-from-github-next) - [Practical tips for keeping your C# code base clean](https://www.wearedevelopers.com/videos/100149-practical-tips-for-keeping-your-c-code-base-clean) - [NoLoJS - Avoiding JavaScript Cruft with HTML and CSS - Aaron T. 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