> Markdown version of [/jobs/ext/1464361-senior-developer](https://www.wearedevelopers.com/jobs/ext/1464361-senior-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 Developer - **Company:** Stealth B2B SaaS Startup - **Location:** London, UK - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** ASP.NET, JavaScript (Programming Language), .NET Framework, Artificial Intelligence, Computing Platforms, Unit Testing, Microsoft Azure, C Sharp (Programming Language), Concurrent Computing, Entity Framework, Windows Presentation Foundation, Microsoft SQL Server, Model View ViewModel, OAuth, Software Architecture, Role-Based Access Control, Openid Connect, Azure DevOps Pipelines, Software Systems, Web Applications, Web Application Frameworks, Windows Desktop, Multithreading, ReactJS, Delivery Pipeline, Software Security, Vue.js, Build Management, AngularJS, Restful APIs - **Published:** July 28, 2026 - **Apply:** https://www.apply4u.co.uk/jobs/x/42188913/ ## About the Role Who You AreWe're looking for someone who is not only technically strong but also enjoys workingwith people. You are:* A clear and open communicator who enjoys collaborating and keeping othersinformed.* Empathetic and customer-focused, always considering how your work improvesthe experience for the people using our products.* Thoughtful and considerate of your teammates, leaving code and systems in abetter state than you found them.* Someone who naturally supports others and is happy to share knowledge.* Comfortable making mistakes and viewing them as opportunities to learn andimprove.* Curious and willing to challenge existing approaches respectfully when youbelieve there's a better solution.* Detail-oriented, understanding that the small things often make the biggestdifference.* Passionate about learning and continuously developing your skills.* You recognise that AI has fundamentally changed the software developmentlandscape, and you embrace the opportunity to use AI responsibly to help usbuild better software, faster, without compromising quality or maintainability. Technical RequirementsEssential* C#* ASP.NET Core (.NET 8/9/10)* WPF and MVVM* RESTful APIs* SQL Server and Entity Framework Core* OpenID Connect, OAuth 2.0 and Role-Based Access Control (RBAC)* Multithreading and concurrent programming* Unit and integration testing* System design and software architecture* Azure DevOps CI/CD Pipelines* Experience with Azure or similar cloud platforms* Experience building secure applications* A good understanding of cybersecurity principles Nice to Have* JavaScript* Experience with modern JavaScript frameworks such as React, Vue or Angular* An appreciation for user experience (UX) and usability* Experience using AI-assisted development tools such as Codex and Claude* Experience designing AI-powered development workflows and effective promptengineering How We WorkWe're a small, experienced engineering team where everyone has the opportunity tomake a meaningful contribution. We value collaboration over ego, practical solutions over unnecessary complexity, andcontinuous improvement over perfection. We encourage questions, welcome newideas, and believe the best solutions come from open discussion rather than hierarchy.If you're someone who enjoys taking ownership, working closely with others, andbuilding software that genuinely makes a difference, we'd love to hear from you. ## Description About the RoleWe're looking for a Senior Developer to join SAL and help shape the future of ourproducts. You'll work closely with our Head of Development to design and build the nextgeneration of our platform while continuing to enhance and support our existingsoftware, including our Windows desktop application and web-based financialmodelling platform. We're currently modernising our software solutions, so your ideas, experience, andtechnical expertise will have a real impact. You'll play an important role not only indevelopment, but also in influencing architecture, technical direction, and engineeringstandards. We're a small team, which means everyone has a voice. Communication is just asimportant as technical ability. Writing great code is only part of the role, you'll also needto collaborate effectively, explain technical decisions clearly, and work closely withcolleagues across the business.We work in an agile environment, but we're pragmatic rather than process-driven. Wecare about delivering value, solving real problems, and continuously improving how wework. Responsibilities* Maintain and enhance our existing software platforms.* Work closely with the Head of Development to design and build our next-generation products.* Contribute to architectural discussions and technical decision-making.* Research, evaluate, and introduce new technologies where appropriate.* Produce and maintain technical documentation.* Share knowledge and support other members of the team.* Continuously look for ways to improve our products, processes, and engineeringpractices. ## Related Videos - [Keeping applications secure by evolving OAuth 2.0 and OpenID Connect](https://www.wearedevelopers.com/videos/100152-keeping-applications-secure-by-evolving-oauth-2-0-and-openid-connect) - [Lessons learned from building a thriving Vue.js SaaS application](https://www.wearedevelopers.com/videos/1666-lessons-learned-from-building-a-thriving-vue-js-saas-application) - [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) - [WeAreDevelopers LIVE – AI, Freelancing, Keeping Up with Tech and More](https://www.wearedevelopers.com/videos/1786-wearedevelopers-live-ai-freelancing-keeping-up-with-tech-and-more) - [Delay the AI Overlords: How OAuth and OpenFGA Can Keep Your AI Agents from Going Rogue](https://www.wearedevelopers.com/videos/1637-delay-the-ai-overlords-how-oauth-and-openfga-can-keep-your-ai-agents-from-going-rogue) - [User 1st! Technology 2nd! Stop building AI nobody uses - start delivering real business outcomes](https://www.wearedevelopers.com/videos/100337-user-1st-technology-2nd-stop-building-ai-nobody-uses-start-delivering-real-business-outcomes) ## Related Articles - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Navigating the AI Shift](https://www.wearedevelopers.com/magazine/629-navigating-the-ai-shift) - [WeAreDevelopers Dev Digest Issue 116 - The new search wars…](https://www.wearedevelopers.com/magazine/445-wearedevelopers-dev-digest-issue-116-the-new-search-wars) - [Dev Digest 132 - Binging WADFlix?](https://www.wearedevelopers.com/magazine/473-dev-digest-132-binging-wadflix) - [Dev Digest 137 - AI'm not sure about this](https://www.wearedevelopers.com/magazine/485-dev-digest-137-ai-m-not-sure-about-this)