This is a full-time, permanent position for a Software Full Stack Support/Developer in a hybrid working model, requiring on-site attendance at least three days per week in Milton Keynes. You will play a key role in designing, developing, and supporting web-based applications for a large-scale managed service program. This position offers the opportunity to work on complex, high-impact projects, collaborating with cross-functional teams to deliver robust, scalable solutions using modern development practices. Candidates must be eligible to obtain UK Security Clearance (standard clearance process takes approximately 6–9 months). Key Responsibilities: * Provide Software Applications Engineering support for larger and more complex applications and project areas. * Perform build and deployment activities for application development efforts. * Design and implement requirements that are effective, timely, and compliant with project standards. * Configure, program, and test application components and technical architecture. * Troubleshoot and resolve defects and performance-related issues. * Ensure compliance with coding standards through design reviews, coding, and unit testing. * Collaborate with Business Analysts to understand requirements and use cases. * Estimate and size assigned use cases with input from the BA team. * Independently deploy QAT or UAT environments. * Work closely with testing teams to resolve regression and newly identified issues. * Explore alternative solutions using structured decision-making techniques. * Participate in code reviews and collaborate with developers, designers, and architects. * Maintain integrity of pre-production environments (development, test, QA, staging). * Lead efforts in process improvement and technical automation. * Provide regular status updates and mentor less experienced team members. Key Qualifications Must-Have: * Strong experience in .NET (C#), ASP.NET, JavaScript, HTML, CSS development. * Proven background in web development using the above or similar technologies. * Experience working with and supporting operational systems. * Knowledge of web development patterns. * Proficiency in Microsoft SQL Server development and scripting or similar. * Familiarity with Azure DevOps or equivalent tools. * Working knowledge of modern development patterns, including Agile. * Eligible for UK Security Clearance. Preferred: * A working knowledge of MVC framework or similar. * Experience with other scripting or database technologies. Additional Information * This is a full-time, permanent role. * We are unable to support sponsorship for this position. * You will be required to attend our site at least three days per week and therefore must live within commutable distance from Milton Keynes