ob Description: Leidos has a new and exciting opportunity for a Senior Systems Engineer in our Intelligence Sector's 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! Program Summary Leidos supports critical missions within the Directorate of Operations and Directorate of Cybersecurity, delivering systems engineering solutions that enable cryptanalysis, foreign intelligence operations, and protection of National Security Systems. Our team explores, designs, and integrates emerging technologies to provide the nation with a decisive advantage over adversaries. Job Summary We're seeking a Senior Systems Engineer to lead complex systems engineering efforts supporting cryptologic and cybersecurity missions. You'll drive requirements development, conduct analysis of alternatives, and lead integration efforts for emerging technologies while providing technical leadership to Government stakeholders and engineering teams. Primary Responsibilities • Lead requirements analysis, solution design, and value modeling for complex cryptologic and cybersecurity systems • Develop comprehensive CONOPs, system architectures, ICDs, and technical documentation • Lead integration, testing, and evaluation of prototypes and systems per NSA standards • Conduct risk analysis and develop mitigation strategies for technical challenges • Develop XML schemas, metadata models, and data element dictionaries for mission systems • Integrate specialty engineering disciplines (reliability, supportability, security) into development processes • Mentor junior engineers and coordinate knowledge transfer initiatives Qualifications • Bachelor's degree in Engineering plus 7 years of relevant experience, OR Master's plus 5 years, OR Doctoral plus 3 years • Alternatively: Bachelor's/Master's/Doctoral in Computer Science, Mathematics, or Physics with equivalent experience • For non-ABET programs: degree must include differential and integral calculus plus 5 of 18 specified technical areas* • Active TS/SCI with polygraph clearance required • Demonstrated technical leadership in systems engineering for complex programs • Experience with analysis of alternatives, value modeling, and risk management • Ability to work in a SCIF environment and travel CONUS/OCONUS 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: October 2, 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.