Entry Level Software Developer jobs in United States

Location: Whiteley (On-site 3 days a week)

Clearance Required: SC Clearance (attainment and maintenance required)

Band Level: Not specified

Leidos heritage companies pioneered the development of air traffic control (ATC) systems in the United States over 50 years ago. Today, our systems handle:

• 75% of U.S. air traffic
• ~60% of the world’s air traffic

Leidos is a trusted partner in air traffic safety and efficiency, with a proven track record of innovation. Our UK Air Traffic Management (ATM) support started with NATS in the early 1990s and continues today with the development of modernised ATM solutions.

This role offers the opportunity to work on a programme delivering critical services and infrastructure key to the future of UK ATM. While the role is primarily on-site at Whiteley (near Portsmouth), remote working opportunities are available once knowledge, capability, and experience are gained.

We are seeking an experienced Software Engineer to support the development of an ATM system. Previous ATM experience is not required; on‑the‑job training will be provided.

The engineer will work in a fast‑paced environment, delivering high‑quality software and collaborating throughout the development lifecycle. Understanding and application of software engineering standards, principles, and best practices are expected.

• Design software using functional and/or object‑oriented methodologies
• Implement software solutions and tools containing logical and mathematical solutions
• Conduct functional, unit, and early system integration testing
• Investigate problems identified during testing and provide solutions
• Prepare operating instructions for software applications and tools
• Document and present research findings to relevant stakeholders
• Apply appropriate standards, processes, and principles in daily activities

• Experience developing software in C and C++
• Experience developing software in Ada
• Knowledge of APIs
• Experience developing on Linux
• Knowledge of configuration management (e.g., Subversion, Git)
• Excellent analytical, design, and problem‑solving skills
• Effective communicator across multidisciplinary teams (Systems, Software, Test & Validation)
• Proactive, flexible mindset with a passion for complex technical challenges
• Motivated to work on mission‑critical products where software performance is essential
• Excellent verbal and written communication skills

• Experience developing software in Java
• Knowledge of infrastructure as code and container technologies (e.g., Puppet, Docker)
• Experience with Atlassian tools (Jira, Confluence)
• Experience with public cloud platforms (e.g., AWS)
• Experience with scripting languages (e.g., Python)
• Experience with systems/software design tools (Enterprise Architect, Cameo Systems Modeller)
• Experience mentoring and supporting junior engineers in a collaborative team environment

Leidos UK & Europe works to make the world safer, healthier, and more efficient through technology, engineering, and science. Our UK operations focus on complex problems in defence, healthcare, government, safety, security, and transportation.

Purpose: Apply your passion and skills to help keep people safe, using cutting‑edge technology in AI, machine learning, cybersecurity, and more.

aboration: Flexible work arrangements enable you to contribute effectively while balancing your needs.

People: Leidos empowers individuals to grow and develop, offering technical academies, career rotations, and development plans to inspire and advance your career.