Salary: £75,000 - 75,000 per year Requirements: 6 years experience developing ASP.NET web applications in C# using Visual Studio/Visual Studio Code Experience creating RESTful APIs and ensuring API extensibility Deep experience of SaaS and Cloud deployed services (Azure ideally) Azure DevOps, CI/CD experience Experience with unit and automated testing Good knowledge of SOLID principles Familiarity with MS SQL Server (Desirable) Knowledge of Event Driven Architecture (Desirable) Experience with Containers (Docker, K8s) (Desirable) Understanding of security best practices (OWASP top ten) Responsibilities: Develop complex software solutions that impact public service safety and security Work on mission-critical systems in a cutting-edge environment Collaborate with team members on large programmes of work in public and private sectors Create and maintain RESTful APIs Implement and ensure the extensibility of APIs Engage in unit and automated testing of developed applications Participate in continuous professional development and training opportunities Technologies: API ASP.NET Azure C# CI/CD Cloud DevOps Docker OWASP SQL Security Visual Studio Web REST More: We are a market leader in our field, offering rewarding career opportunities with progression and continuous personal development. Our company provides a range of global projects, and we are excited to present this high-impact opportunity for a Senior Software Developer. Located along the Fareham / Southampton border, we promote a hybrid working model with two days onsite. We are looking forward to discovering your potential and how you can contribute to our mission. last updated 11 week of 2026