Junior Application Software Developer
Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. They are seeking a Junior Application Software Developer to contribute to the development of web applications and service-based tools used in operational environments, working closely with senior engineers and cross-functional teams. Responsibilities 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 Skills Must be eligible and willing to undergo DV clearance (British Citizen, UK residency last 10 years) 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 Degree in Computer Science / Software Engineering (or equivalent experience) 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 Professional membership (BCS, IET) is a plus Benefits Health and Wellness programs Income Protection Paid Leave Retirement Company Overview Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. It was founded in 1969, and is headquartered in Reston, Virginia, USA, with a workforce of 10001+ employees. Its website is