ADA Software Engineer in Southampton

Location: Whiteley (Hybrid / Primarily Home-Based)

Security Clearance: Must hold or be eligible for SC clearance

We are looking for a Software Engineer to join our Air Traffic Management (ATM) programmes. This role offers the opportunity to work on safety-critical, real-time Air Traffic Control systems, supporting customers who depend on highly reliable software every day. You will work as part of a multi-disciplinary engineering team, contributing across the full software lifecycle from requirements and design through to delivery and operational deployment. The role involves working on multiple applications, so it suits someone who enjoys variety and structured problem-solving.

What You’ll Be Doing:

• Investigating and resolving software and system issues
• Developing software requirements, designs, and solutions
• Contributing to architecture and design activities
• Building, maintaining, and updating software applications
• Producing and executing software test plans
• Supporting change, configuration, and release management activities
• Working closely with Systems Engineering, Test teams, and project stakeholders
• Ensuring all work follows defined engineering processes and software assurance standards

Required Skills:

• Proven experience developing real-time, safety-related software
• Strong experience with C++ (experience of Ada, C or similar is beneficial)
• Experience working to Waterfall and/or V-Model development approaches
• Experience developing software on Windows and Linux platforms
• Experience across the full software lifecycle, from requirements through to delivery
• Background in software development, integration, and test
• Strong problem-solving and analytical skills
• Ability to work collaboratively within multi-disciplinary teams
• Clear written and verbal communication skills
• Good time management and organisational skills

Desirable Skills:

• Knowledge of ED-109A or similar software assurance standards
• Experience with Visual Studio and modern development environments
• Experience of Agile methods (e.g. Scrum)
• Knowledge of modelling languages (e.g. UML, SysML)
• Experience with scripting languages such as Python
• Familiarity with Jira or other Atlassian tools
• Understanding of configuration management best practices

What we do for you:

At Leidos we are PASSIONATE about customer success, UNITED as a team and INSPIRED to make a difference. We offer meaningful and engaging careers, a collaborative culture, and support for your career goals, all while nurturing a healthy work-life balance. We provide an employment package that attracts, develops and retains only the best in talent. Our reward scheme includes:

• Contributory Pension Scheme
• Private Medical Insurance
• 33 days Annual Leave (including public and privilege holidays)
• Access to Flexible benefits
• Flexi Working

Commitment to Diversity:

We welcome applications from every part of the community and are committed to a truly diverse and inclusive culture. We foster a sense of belonging, welcoming all perspectives and contributions, and providing equal access to opportunities and resources for everyone. If you have a disability or need any reasonable adjustments during the application and selection stages, please let us know, and we will respond in a way that best fits your needs.

Who We Are:

Leidos UK & EUROPE we work to make the world safer, healthier, and more efficient through technology, engineering and science. Leidos is a growing company delivering innovative technology and solutions focused on safeguarding critical capabilities and transformation in frontline services, our work in the United Kingdom includes addressing some of the most complex problems in defence, healthcare, government, safety and security, and transportation. Working together as Team Leidos we are helping to transform the UK's defence supply chain by providing an integration of a complex mixture of services, at low risk, using a modern suite of systems that will deliver one version of the truth. For the first time, the MOD will see the whole picture, as it is happening.

What Makes Us Different:

• Purpose: you can use your passion and abilities at Leidos to keep the people you care about safe. We are at the forefront of machine learning, AI, cyber security and solutions. Using your skills in the technology frontline by helping to build a safer world. You can inspire change.
• Collaboration: having flexibility to do your job is one of our core benefits, enabling you to become part of our extraordinary team. We have been empowering our people to work flexibly for years. Whether you work from home, the office or on customer sites, we will give you the digital tools and the flexibility to work smarter and align your needs and ours.
• People: Leidos empowers people from every background to be themselves and gives you the tools to learn new skills by enabling growth whilst developing. We believe that extraordinary people need opportunities to grow, to be inspired and to inspire others. At Leidos, we invest in technical academies, career rotations and a career development plans that enhance your future.