Principal Software Engineer

Description

Leidos Defense Systems is seeking a talented Principal Software Engineer that contributes to and mentors software teams to create unique solutions for complex problems. We have offices across the United States engaging in the defense, space, cyber and commercial fields, We provide responsive, cost-effective engineering, scientific and IT solutions.

This role is part of an engineering matrix organization with the Program Integration team that supports many programs that span business areas. Responsibilities include contributing to and mentoring software development teams during the software development process to support a variety of customers, often with competing requirements.

The candidate must be comfortable in a fast-paced working environment and be a motivated independent learner. The candidate must be highly organized and possess strong verbal and written communication skills.

• Candidate must possess a Bachelor's Degree in Computer Science, Computer Engineering, or equivalent degree from an ABET-accredited university.
• Candidate must have at least 12+ years of experience or 10+ years with a Master’s.
• Candidate must have experience in analyzing and developing requirements, designing and maintaining software products, and implementing software designs. Candidate must be able to parse ambiguous requirements and translate into team direction and guidance.
• Candidate must have experience in desktop software development activities. Candidate must have experience in software development, data structures, object oriented design, and effective unit test. Candidate must have experience with multiple languages that include C or C++, C# or Java, and Python or other similar scripting language.
• Candidate must have experience with Agile/Scrum methodologies and task management.
• Candidate must have experience mentoring teammates and providing guidance to accomplish tasks and projects.
• Candidate must have experience with software best practices such as peer reviews, automated testing, and document generation.
• Candidate must be a resident of the North Alabama area or willing to relocate to the Huntsville - North Alabama, AL area.

• Master’s Degree in Computer Science, Computer Engineering, or equivalent degree from an ABET-accredited university would be considered a plus.
• Prior Unity Real-Time Development platform experience and working with modeling and simulation platforms is a plus
• Prior experience interviewing or contributing to proposals is a plus.

At Leidos, we don’t want someone who "fits the mold"—we want someone who melts it down and builds something better. This is a role for the restless, the over-caffeinated, the ones who ask, “what’s next?” before the dust settles on “what’s now.”

If you’re already scheming step 20 while everyone else is still debating step 2… good. You’ll fit right in.

January 9, 2026

For U.S. Positions:
While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range $ - $

The Leidos pay range for this job level is a general guideline onlyand 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.

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.