Senior Software Developer

Location: UK Mobile Worker with travel to Leidos offices as required

Salary Range: £61,500 - £78,800

Are you ready for your next career challenge?

Enterprise Supply Chain Services (ESCS) is the part of solution responsible for sourcing and procurement, inventory, planning and order management.

Role overview

As a Software Developer, you will design, build, test and maintain software components and integrations that support ESCS capability delivery.

You will work as part of a multidisciplinary agile team, following agreed architecture, engineering, security and quality standards. We welcome different perspectives and encourage collaborative problem-solving.

What will I be doing?

Turn agreed stories and designs into working, supportable software.

Collaborate with colleagues across analysis, architecture, testing, data and infrastructure.

Contribute to a healthy engineering culture through review, documentation and continuous improvement.

Key responsibilities:

Develop and maintain applications, APIs, integrations and supporting components.

Write clean, secure and testable code using agreed patterns and standards.

Create and maintain unit tests and contribute to integration test automation.

Participate in code reviews, design discussions, estimation and backlog refinement.

Use Git-based workflows and CI/CD pipelines to build and deploy changes.

Investigate defects and support root-cause analysis.

Maintain technical documentation and contribute to operational readiness.

Continuously improve knowledge of the platform, domain and engineering toolchain.

Essential skills and capabilities

Software development in one or more relevant languages

API development and integration fundamentals

SQL and data access fundamentals

Secure coding practices

Unit testing and debugging

Git and collaborative code review

CI/CD awareness

Agile delivery and user story implementation

Code quality tooling and documentation

Problem solving and clear communication

Essential experience

Practical experience developing and testing software in a team environment.

Experience using source control and structured development practices.

Experience delivering against defined requirements or user stories.

We recognise that skills and experience can be gained in different ways. If you meet most of the essential criteria and are interested in the role, we encourage you to apply.

It would be great if you had experience in the following:

Azure or AWS services.

Enterprise integrations or SaaS platforms.

Infrastructure as Code and automated deployment awareness.

Containers, messaging or event-driven systems.

Success in the role

Changes meet acceptance criteria and engineering standards.

Code is understandable, tested and maintainable.

Defects and blockers are raised early and resolved collaboratively.

Knowledge and delivery independence increase over time.

Clearance requirements:

SC required to start
SC required for the role

Leidos UK! Join our team and discover a culture of collaboration, innovation, diversity, trust, caring management, communication transparency, work-life balance, and overall job satisfaction...

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 (including life assurance, health schemes, gym memberships, annual buy and sell holidays and a cycle to work scheme)

• Flexible Working Scheme

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.

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.

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting:

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:

£61,500.00-£78,800.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

About Us

Leidos

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit www.Leidos.com.

Pay and Benefits

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available here.

Securing Your Data

Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to spam.leidos@leidos.com.

Commitment and Diversity

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.

Software Developer