Senior Software Engineer - C#, Javascript in Fareham, Hampshire

Senior Software Engineer (Full Stack)Location: Farnborough or Whiteley, with flexibility to work from home dependent on business demandsSalary: 61,500 - 78,800The 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. Overall technical approach is agreed collaboratively with the Technical Lead and Software Architect.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 JavaModern single‐page applications implemented using React/TypeScript or equivalent frameworksMake 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 their own changes:Make updates as necessary to ensure changes do not break the pipelineAct as a guide for other developers to ensure pipeline practices are understood and maintainedWrite and maintain unit tests and integration tests as a standard part of development.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.Mentor and support less experienced engineers through technical guidance, code reviews, and informal coaching.Software engineering experience, including substantial hands‐on delivery using:Java (Java 8 and modern Java versions such as 17 and 21)REST API design and implementationModern SPA development experience (required) using React and TypeScript, Angular, or Vue.Strong understanding of design patterns and a solid, structured approach to software development.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.Experience working with code review standards, quality gates, CI/CD pipelines, and security scanning processes.C/C++ experience.Perl, Python, and/or bash scripting experience.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 UKWhat we do for you: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. 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 WorkingCommitment to Diversity:We welcome applications from every part of the community and are committed to a truly diverse and inclusive culture. 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 agrowing 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. 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. 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.Pay Range:61,500.00-78,800.00The 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.Whiteley, Hampshire, UKType: Full time