Sr. Systems Engineer TS/SCI Poly

Leidos has a new and exciting opportunity for a Sr. Systems Engineer in our Intel 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! Job Summary A Senior Systems Engineer is needed to join a high performing agile team using the Scaled Agile Framework (SAFe) methodology. Candidates must possess a high level of in-depth expertise necessary to design and develop new capabilities for a complex system with exacting interface, performance, and security requirements. The selected individual will provide system engineering expertise in several of the following areas: architecture, design, development, requirements analysis, data flow, network design/implementation, testing, and documentation. She/he will analyze user requirements, system architecture, and system requirements specifications, provide systems engineering expertise, and develop system architecture and system design documentation. Responsibilities include supporting and providing guidance for system development and implementation planning through assessment of system engineering plans and system integration and test plans; supporting the development of system configuration documentation, including designs for capacity and performance planning; and performing engineering activities such as risk assessments and analyses of alternatives for a variety of system related issues and concerns. Responsibilities may also include helping to create test procedures and defining task success criteria. Primary Roles and Responsibilities Provide guidance and support for system engineering of large-scale systems, major system elements, and interfacing systems that are part of a large complex network environment with geographically distributed components. Provide technical guidance and support for future system enhancements and design. Update System Engineering Documentation. Provide Analysis of Alternatives (AoA) or similar evaluation methodologies. Interface with Program Management, System and Software Integration Engineers, Test Engineers, Information Assurance Engineers, and other project team members in an Agile environment. Develop and implement system engineering practices ensuring the proper degree of engineering rigor is applied to all assigned tasks. Communicate with and effectively collaborate with internal technical professionals on a day-to-day basis, and with representatives from customer organizations when necessary. Actively participate in program increment planning and related Agile team activities. Provide hands on technical assistance to engineering teams for data gathering and auditing purposes throughout multiple data centers. Basic Qualifications Masters with 15 – 20 years of prior relevant experience or Doctorate with 13 – 16 years of prior relevant experience. Must have in-depth experience in several of the following areas: system architecture, design and development, requirements analysis, data flow design/analysis, network design/implementation, testing, technical system documentation. Must have experience or strong familiarity with data centers and/or server rooms, to include the following: Rack based Servers, Network Switches, KVM's, Routers, Backup and Recovery devices, Firewalls, and security appliances. Must have at least 1-3 years of experience with infrastructure components (Servers, Switches, Firewalls, and other Enterprise Infrastructure hardware). Must have at least 5 years of experience working on system architecture design, building, and integration. Must have at least 5 years of experience working on large complex system architectures. Must have requirements verification traceability experience. Must have experience analyzing user requirements, system architecture, and/or system requirements specifications. Must have experience in discovery, research and analysis for hardware and software transitions. Must have experience gathering information related to the lifecycle of equipment and software. Must possess a solid understanding of secure systems engineering and development. Must be comfortable working on multiple systems and components simultaneously in various configurations. Must be able to effectively plan and prioritize tasking and communicate clearly regarding technical options and trade‑offs. Must be capable of performing systems engineering activities in support of Agile teams on a large program. Must be committed to adopting, adhering to, and championing best practices. Preferred Qualifications In-depth experience transitioning legacy systems to new architectures. Experience with model-based systems engineering. Experience with risk management/risk register. Experience with the Scaled Agile Framework (SAFe) methodology or as a member of an Agile team. Experience working as an admin on Windows Server and Linux Server platforms. Clearance Required Must have TS/SCI with Polygraph on day one. This is firm. Pay Range Pay Range $154,050.00 - $278,475.00 Additional Pay Range Pay Range $154,050.00 - $278,475.00 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. Recruitment Overview 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. Posting Information Original Posting: June 22, 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 and Benefits Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available here. Commitment and Diversity 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. Company Overview Leidos Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit #J-18808-Ljbffr Leidos LLC