Senior Engineer; React​/Apis

Senior Full Stack .NET Engineer (React / APIs)

Location:

UK - Remote first, but open to 1 day, twice per month or a monthly day in Portsmouth.

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.

• Define system objectives by analyzing 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

• 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 Dev Ops practices
• Strong problem-solving and debugging skills
• Excellent communication and collaboration skills
• Ability to manage priorities and work across multiple projects

• Experience working on integration-heavy platforms
• Experience supporting production systems with high availability requirements
• Previous mentoring or leadership experience