Senior Software Developer

Senior Software Developer (Contract)

Location: Warton - Hybrid (3 days per week on site)

Rate: £46.80 per hour (Umbrella)

Contract Length: 12 months

IR35: Inside IR35

Overview

A leading UK defence company is seeking an experienced Senior Software Developer to join a highly skilled engineering team working on mission‑critical, safety‑critical systems used by military personnel.

This role involves developing and maintaining a suite of engineering support applications that enable frontline users to retrieve operational data, diagnose issues, and ensure continued system availability in demanding environments. The position offers hybrid working and the opportunity to contribute to long‑term, high‑integrity software programmes within the defence sector.

The Role

You will work on a mature .NET desktop application estate, contributing to both enhancement and ongoing support activities. The software environment blends established systems with opportunities for modernisation and improvement, offering technically varied and meaningful work.

In addition to core desktop applications, the team also develops smaller specialist utilities, creating exposure to a range of development challenges and platforms.

Key Responsibilities

Analyse system and user requirements to influence software design and delivery planning

Design, implement and configure new functionality with a focus on maintainable, high‑quality code

Produce unit/module tests and associated software documentation

Support Build, Integration and Test teams during formal qualification and verification activities

Collaborate closely with multi‑disciplinary engineering teams

Research and recommend new tools, technologies and development approaches

Share knowledge, provide technical guidance and support continuous improvement within the team

Essential Skills & Experience

Strong commercial experience using C#

Experience developing desktop applications with WPF and/or WinForms

Experience working with or maintaining VB6 applications

Solid understanding of structured software development in regulated or engineering‑led environments

Desirable Experience

Source control tools such as Git or ClearCase

Automated testing tools (e.g. Coded UI, Rational Robot or similar)

Oracle, SQL

COM, .NET Interop

XML (XSD/XSLT)

Entity Framework

Team Foundation Server / Azure DevOps

Qualifications

Degree in a STEM discipline or equivalent relevant industry experience

For more information please contact Lauren Morley at JAM Recruitment or click apply