Senior Full Stack .NET Engineer (React / APIs)

Senior Full Stack .NET Engineer (React / APIs) Location: UK - Remote first, but open to 1 day, twice per month or monthly day in Portsmouth About the Role We are looking for a highly skilled Senior Full Stack Engineer to join a collaborative development team working on a complex, integration-focused platform. This is a product-focused role where you will design, build, and maintain scalable, high-performance web applications that support real-time operational workflows. You will play a key role in shaping system architecture, delivering robust solutions, and supporting critical production systems. Key Responsibilities Define system objectives by analysing user requirements and business needs Design and develop web applications using C#/.NET (ASP.NET Core) and modern frontend frameworks Build and maintain RESTful APIs and integration services Contribute to architectural decisions, evaluating technical solutions and trade-offs Collaborate with cross-functional teams to enable system interoperability Troubleshoot development and production issues across multiple environments Support high-availability systems with ongoing maintenance and monitoring Participate in Agile development processes and team discussions Maintain high standards through code reviews, testing, and continuous improvement Provide guidance, mentoring, and technical support to other developers Create documentation and tools to support system usage and maintenance Stay up to date with emerging technologies and best practices Skills and Experience Required Strong experience with C# and .NET (ASP.NET Core) Proven experience building web applications and REST APIs Experience with React (Angular or Vue also considered) Solid understanding of full stack development principles Experience with cloud platforms (Azure preferred) Exposure to microservices and distributed systems Strong database experience (e.g. SQL Server or equivalent) Familiarity with CI/CD and DevOps practices Strong problem-solving and debugging skills Excellent communication and collaboration skills Ability to manage priorities and work across multiple projects Desirable Experience working on integration-heavy platforms Experience supporting production systems with high availability requirements Previous mentoring or leadership experience To find out more about Computer Futures please visit Computer Futures, a trading division of SThree Partnership LLP is acting as an Employment Business in relation to this vacancy | Registered office | 8 Bishopsgate, London, EC2N 4BQ, United Kingdom | Partnership Number | OC(phone number removed) England and Wales