Senior Software Engineer

Leidos has a new and exciting opportunity for a Senior Software Engineer in our National Security Sector's (NSS) Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos
, we offer competitive benefits
, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more.
Join us and make a difference in National Security!

This position is eligible for a sign on bonus of $25,000.

Leidos is seeking a driven and experienced Full Stack Software Engineer to support a high-stakes, mission-critical program. In this role, you'll help architect, develop, and integrate software solutions that shape national security and drive meaningful innovation. Join an Agile team where your expertise won’t just be valued—it will be vital.

• Design, develop, and enhance secure software applications and systems
• Integrate new software into evolving operational environments
• Analyze user needs to craft efficient and scalable solutions
• Debug and optimize existing software for performance and reliability
• Implement complex algorithms that meet rigorous technical standards
• Create and maintain system documentation and technical reports
• Collaborate in Agile Scrum teams to deliver rapid, high-quality releases

• Bachelor's degree in Computer Science or related discipline. In lieu of degree an additional 4 years of software engineering may be considered
• 14+ years of software engineering experience supporting programs of similar type and scope
• Familiarity with front-end frameworks (React, Angular, or Vue)
• Proven ability to lead technical efforts and ensure code quality
• Experience with modern programming languages such as Java
• Clearance Requirement: Must have an active TS/SCI clearance with Polygraph

• Proficient in Java for backend development
• Strong knowledge of Git, Linux, Jira, Eclipse, and Confluence

CONMD
CSSRC

We’re not looking for perfectly polished resumes or perfect fits. We’re looking for people who break limits, ask hard questions, and don’t wait to be told what’s next. At Leidos, we’re not following the roadmap — we’re redrawing it.

Original Posting: November 6, 2025

Pay Range: $ - $