Junior Application Software Developer

Location: Commutable to Herefordshire, Cheltenham, and Bristol - mostly on-site (4 days/week on customer site, 1 day remote where appropriate), * Contribute to development of web applications, APIs, and service-based tools used in operational environments.

• Write and maintain code primarily in Python (and C++ where performance or legacy components require it).
• Support UI and backend implementation (e.g., web UIs, REST APIs, data processing services).
• Build automation and data-processing utilities to streamline workflows.
• Participate in testing, debugging, and quality activities with coaching.
• Help refine requirements and implement features within a cross-functional team.
• Contribute to documentation and follow traceable, peer-reviewed Git practices aligned with governance policies.

Clearance: Must be eligible and willing to undergo DV clearance (British Citizen, UK residency last 10 years)

Are you starting your software engineering career and excited to build applications that solve real operational problems? Want to work closely with users and see direct impact from what you ship?

You'll join a National Security & Defence delivery team building primarily web and service-based applications (with some desktop tooling where needed). This is a junior role: you'll contribute under the guidance of senior engineers with strong peer review and support., * Hands-on software development experience (academic, hobbyist, internship, or professional).

• Working knowledge of Python (and/or C++ or another modern language).
• Understanding of core engineering practices: modularity, testing basics, version control.
• Familiarity with Linux and/or Windows development environments.
• Curiosity, strong problem solving, and ability to take feedback constructively.

Desirable:

• Exposure to web frameworks (e.g., FastAPI, Flask, Django) and REST APIs.
• Basic frontend awareness (HTML/CSS/JavaScript, or a framework such as React/Vue).
• Secure coding awareness (input validation, secrets handling, logging hygiene).
• Experience with containers (Docker) or CI basics., * Degree in Computer Science / Software Engineering (or equivalent experience).
• Professional membership (BCS, IET) is a plus.

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 at www.leidos.com/careers/pay-benefits.

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., 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 $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com.