Leidos has a new and exciting opportunity for a Sr. Systems 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!Job Summary:

This project provides the full range of systems design, analysis, integration, verification, and validation activities in support of the Navy’s Key Management project portfolio. The selected candidate will provide systems engineering expertise in the following areas: system architecture and design; development and integration; requirements analysis, data flow analysis; network design and implementation; test/verification and validation; and documentation for the system. The selected candidate will be responsible for collaborating with internal technical professionals on a day-to-day basis, and with POCs from customer organizations when necessary.

Additional position responsibilities also include:

• Lead system engineering, hardware, and software analysis to support the Navy’s Key Management project portfolio.

• Define and apply systems engineering processes to develop systems that meet customer requirements.

• Manage requirements, including decomposition, allocation, verification, and validation for subsequent use by the development and test teams.

• Define and develop System Architecture, CONOPS, and use case development using systems engineering methodologies.

• Participate and lead discussions at customer meetings, working groups, and technical interchange meetings associated with the work performed in this project.

• Required to research, design, write, and review a wide range of technical documentation that will include but not be limited to: technical manuals, design specification documents, interface requirements specification, system user guides, reference manuals, installation guides, and data sheets that may be required to assist with the design, integration, testing, and fielding of the system; will provide project briefing materials upon request.

• Option to work a 9/80 work schedule (i.e., 9 hour days, then work 8 hours on first Friday and off the second Friday)

• The selected candidate will be required to work at the customer facilities up to 5 days a week. Some teleworking may be available.

Required Qualifications:

• Bachelor's Degree in System Engineering, Computer Science, Information Systems, Engineering Science, Engineering Management, or a related field, with 8+ years of experience. Will consider experience in lieu of a degree.

• Position requires US citizenship and an active Secret DoD security clearance.

• Experience that demonstrates ability to analyze risks and uncertainties and ability to navigate projects through established processes.

• Model based systems engineering experience.

• Experience with database management software, such as MySQL, Oracle RDBMS, and Microsoft SQL Server.

• Familiarity with operating systems, such as Linux and UNIX.

• Understanding complex system development methods.

• Experience with technical documentation development.

• Knowledge of software design patterns.

• Knowledge of Agile Development methodologies.

• DoD 8570 approved security certification (i.e., Security +) (Will be required 90 days after hire).

Desired Qualifications:

• Software development or shell scripting experience.

• Past experience using CAMEO a plus.

• Excellent scripting skills with knowledge of programming languages, such as Perl, Ruby, and Python.

• Good knowledge of networking protocols, such as TCP, IP, and OSI models.

• Past Test Driven Development (TDD) experience a strong plus.

• Experience with CUCUMBER or similar TDD automation framework a plus.

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:

April 8, 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:

Pay Range $107,900.00 - $195,050.00

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.