Senior Software Engineer (Full Stack) in Basingstoke

Location: Farnborough, with flexibility to work from home dependent on business demands

Salary: £61,500 - £78,800

Role

As a Senior Software Engineer you will play a critical role in both the sustainment of the current environment and the delivery of new capabilities. You will develop solutions to complex technical issues and problems that impact multiple areas or disciplines; regularly employ ingenuity and creativity to develop new technical solutions and systems to achieve functional objectives. This is a senior individual contributor role.

Responsibilities

• Deliver high‑quality, production‑ready software through hands‑on development, spanning both backend and front‑end technologies.
• Develop, debug, test, document, and deploy software enhancements aligned with the Software Development Strategy.
• Contribute to full‑stack delivery, including backend services and REST APIs implemented in Java, and modern single‑page applications implemented using React/TypeScript or equivalent frameworks.
• Make technical decisions within assigned scope, aligning with agreed architectural direction and escalating broader decisions where appropriate.
• Apply strong software engineering practices to ensure solutions are clean, maintainable, well‑documented, and fit for long‑term operation.
• Ensure adherence to established code review standards and quality gates for all changes delivered within the project.
• Continuously validate and maintain the build and deployment pipeline for your own changes: update as necessary and guide other developers on pipeline practices.
• Write and maintain unit tests and integration tests as a standard part of development.
• Support and contribute to test automation efforts, working closely with the test team.
• Collaborate closely with other engineers, architects, and testers to ensure new and modified software is fully verified prior to promotion.
• Support Agile delivery practices, including planning, estimation, backlog refinement, and iterative delivery.
• Use and support development tooling and processes, including CI/CD pipelines and integrated security scanning.
• Mentor and support less experienced engineers through technical guidance, code reviews, and informal coaching.
• Communicate effectively with peers and stakeholders on technical matters, providing clear and well‑reasoned input.

Qualifications

• 10+ years of software engineering experience, including substantial hands‑on delivery using Java (Java 8 and modern Java versions such as 17 and 21) and REST API design and implementation.
• Modern SPA development experience (required) using React and TypeScript, Angular, or Vue.
• Strong understanding of design patterns and a structured approach to software development.
• Proven experience delivering complex changes in production environments.
• Demonstrated experience writing unit and integration tests as a normal part of delivery.
• Familiarity with Agile software development processes and working within iterative delivery models.
• Familiarity with the Atlassian tool suite (e.g. Jira, Bitbucket, Bamboo) or equivalent tooling, with a solid understanding of CI/CD concepts, workflows, and practices.
• Experience working with code review standards, quality gates, CI/CD pipelines, and security scanning processes.

Desirable Skills and Experience

• Familiarity with integration and architectural patterns (e.g. adapters, orchestration patterns such as saga).
• 3+ years C/C++ experience.
• Perl, Python, and/or bash scripting experience.
• Experience contributing to or supporting test automation initiatives (UI and/or API).

Clearance Requirements

Successful candidates will be required to be willing and able to obtain UK Security Clearances - this requires a minimum of 5 years residency in the UK.

Benefits

• 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)
• Flexi‑Time 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.

Commitment to Non‑Discrimination

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.