Senior Software Developer
MASS
Overview
In this on-site role you will contribute to the maintenance and enhancement of mission-critical planning software for secure environments. You will work embedded with a client team, balancing development, testing and documentation to maintain high customer confidence. You’ll design and implement solutions in Windows and Red Hat Linux, collaborating with customers and cross-functional peers. This position offers strong wellbeing and career development support within a mission-driven tech company. A clear hook is the opportunity to shape critical software used in secure, real-world operations.
Pay / Benefits- 25 days annual leave
- Buy/sell up to 5 days
- Continuous Professional Development support
- Two pension schemes
- Life Assurance up to 4 x salary
- Private Medical & Dental Insurance
- Understand requirements and scope changes for work items
- Design, develop and maintain existing codebase
- Test and review software and documentation
- Participate in meetings, sharing domain knowledge and technical input
- Collaborate effectively within a team and communicate clearly
- Suggest and implement continuous improvement opportunities
- 5+ years in C# development or another language
- Strong knowledge of .NET development and Visual Studio
- Experience with version control (Git)
- Familiarity with Windows and Red Hat Linux environments
- Eligible to work in the UK and to obtain UK Developed Vetting clearance
- strong communication
- collaboration
- problem solving
- C#
- .NET
- Visual Studio
Reference: WJ-747_31216227 · Posted 01 Nov 2026, 12:16 PM