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Salary
≈ $79k – $149k per year (Estimated)
Location
Hybrid (Corsham, United Kingdom)
Seniority
Senior · 5+ years exp
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 17, 2026. First seen by Alion on Oct 16, 2026.

Overview
Company
Impact
Profile match
Expert countermeasures, secure software development, and UK sovereign IT services. We provide the technical and operational expertise required for high-threat environments.

Senior Software Developer - On-site, Corsham (SN13)

  • DOE
  • 25 days annual leave (in addition to Bank Holidays)
  • Buy or sell up to 5 days annual leave
  • Continuous Professional development support
  • Two pension schemes to choose from
  • Life Assurance scheme up to 4 x salary
  • Private Medical & Dental Insurance + discounts for additional family members
  • Other benefits such as Health & Wellbeing Allowance, Electric/Hybrid Car leasing scheme, Cycle to work scheme and more.

This is an opportunity to make an impact within a dedicated team that takes great pride in delivering solutions in a role of critical importance, working embedded on a client site. As a software engineer you can expect to be involved in supporting ongoing maintenance and enhancement of mission-critical planning software, working in both Windows and Red Hat Linux environments.

The role requires contributing to a rigorous development and test cycle that maintains high customer confidence in both the software and the team maintaining it.

The successful candidate will be a confident C# engineer, proficient in .NET thick and thin development ideally with an education background in STEM, with the ability to work effectively in a dynamic environment whilst liaising regularly with the customers. The role is based in-office in Wiltshire but may involve occasional travel both within and outside of UK.

Duties / Responsibilities:

  • Ability to comprehend requirement / document changes to analyse a scope of change required for a work item.
  • Design, development and maintenance of an existing code solution.
  • Testing and reviewing software applications and supporting documentation.
  • Contributing to meetings and work groups, providing domain knowledge and expertise on technical matters.
  • Collaborating within a team environment, and communicating effectively.
  • Suggesting improvements for continuous improvements.

Essentials

  • You demonstrate the qualities of an engineer and enjoy the challenge of building complex or efficient software solutions.
  • You want to apply your natural ingenuity to solve challenging engineering problems
  • You're keen to learn new technologies and languages
  • You have a good understanding of computing fundamentals (e.g. logic, data structures) along with strong software design skills, including Object-Oriented Programming, and knowledge of version control systems such as Git
  • 5+ years’ experience in C# development, or another language
  • Knowledge of Visual Studio & MS Office Products
  • Must be eligible to work and live in the UK
  • Must be eligible to undergo and maintain appropriate UK government Developed Vetting security clearance

Who is MASS

MASS is an independent, global technology company, trusted by highly secure organisations to provide advanced, digital services that manage data and keep information safe. With our heritage in defence, we offer robust solutions to sectors where security expertise is essential.

Wellbeing is at the core to our culture, allowing employees to flourish and to achieve their full potential. Our people are important to us, and we take pride in our wellbeing programmes and policies that support individuals including, mental health first aiders and readily available support through our extensive employee assistance programme.

We work in partnership with customers, using skilled, technical experts. We think innovatively to provide tailored, agile and resilient solutions that secure advantage, so you’re ready for digital transformation. MASS is an equal opportunities employer; we know that our people are smart, skilled and motivated and in return we provide a friendly workplace where everyone is valued and has the chance to make an impact.

Apply today to see how working for MASS could work for you!

Skills

General Skills - LINUX, General Skills - Git, General Skills - MAINTENANCE, General Skills - DOCUMENTATION

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