Leidos is seeking a talented Software Systems Engineer to join a multi-disciplinary team within a matrixed organization to create unique solutions for complex problems, specifically regarding missile defense systems. With offices across the United States engaging in the defense, space, cyber and commercial fields, Leidos provides responsive, cost-effective engineering, scientific and IT solutions.
The Software Systems Engineer will support systems engineering needs throughout the software lifecycle of complex software systems. This includes deriving requirements, defining software interfaces and behaviors, and supporting verification and traceability of requirements. The selected candidate will develop and maintain a clear understanding of the overall software system functionality, interdependencies and interfaces. This includes communicating with a multi-disciplinary engineering team of both internal and external stakeholders. The selected candidate will also assist in maintaining the SysML software model in Cameo Systems Modeler.
Primary Responsibilities:
- Develop and maintain a clear understanding of overall system interdependencies and interfaces
- Derive software requirements and use cases with traceability to system requirements
- Drive definition of desired software functionality to meet System of System needs
- Utilize Model-Based Systems Engineering (MBSE) methodologies to support creation of deliverables and traceability to software requirements
Basic Qualifications
- A Bachelor’s degree in Systems Engineering, Software Engineering, Computer Science, Computer Engineering, or equivalent degree from an ABET-accredited university with 8-12 years of prior relevant experience or an MS with 6-10 years prior relevant experience
- Demonstrated understanding of the top-down systems engineering process for architecture development and bottoms-up verification
- Experience in deriving software requirements and use cases for complex systems
- Experience defining system interdependencies and interfaces
- Experience defining desired software functionality in collaboration with stakeholders
- Experience effectively collaborating and communicating within a multi-disciplinary team and external stakeholders
- Experience using requirement database tool(s) such as DOORS or Cameo Systems Modeler
- Experience working within an Agile environment (or equivalent)
- Must be a US Citizen and possess (and be able to maintain) a Final Secret Clearance or meet the eligibility to obtain (and maintain) a Secret Clearance
Preferred Qualifications
Preferred candidates will also have experience and/or working knowledge with:
- MBSE methodologies, particularly modeling in Cameo Systems Modeler (or equivalent) using SysML
- DoD acquisition processes and methods
- Software engineering throughout the software lifecycle
- Resident of the North Alabama area or willing to relocate to the Huntsville - North Alabama, AL area
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.
Original Posting:November 25, 2025For 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.
The Leidos pay range for this job level is a general guideline only and 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.
Top Skills
What We Do
We Are Leidos
For 50 years we have been tackling some of the biggest problems that face our nation and our world.
OUR MISSION
Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020.
Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®.
Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos.
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