Leidos has a new and exciting opportunity for a Sr. RMF Security 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!
The Senior Software Architect will lead the development of new capabilities for a complex, high‑performance system. This role oversees a team of developers, drives high‑level architectural decisions, and manages the full software development process in an Agile environment. The architect collaborates daily with program management, integration, testing, and information assurance teams, serving as the technical expert for system design. Responsibilities include defining architectural direction, evaluating requirements against cost and schedule constraints, and establishing strategies for application monitoring, infrastructure, interfaces, and critical business functions.
Position responsibilities will include:
Designs, develops, documents, tests and debugs applications software and systems that contain logical and mathematical solutions.
Conducts multidisciplinary research and collaborates with equipment designers and/or hardware engineers in the planning, design, development, and utilization of electronic data processing systems for product and commercial software.
Determines computer user needs; analyzes system capabilities to resolve problems on program intent, output requirements, input data acquisition, programming techniques and controls; prepares operating instructions; designs and develops compilers and assemblers, utility programs, and operating systems.
Formulate software designs that create solutions meeting various desired outcomes (both current and future) while balancing the goals and constraints on the solutions (i.e. customer environment, cybersecurity, continuous integration/continuous delivery (CI/CD), etc.).
Manage change to the software architecture and control software complexity.
Make software architecture and solutions as flexible as possible.
Defend against, when appropriate, suggested changes to the software architecture that introduce undue complexity or future supportability issues.
Assist with trade off analyses of increased complexity.
Oversee and support the coaching and training of team members to ensure all necessary employees are confident in the use of software applications.
Participate and lead discussions at customer meetings, working groups, and technical interchange meetings associated with the work performed in this project.
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).
Required Qualifications:
Bachelor's Degree in Computer Science, Software Engineering, or Information Systems or a related field and at least 12+ years of related experience or Master’s Degree with at least 10+ years of relevant experience. Additional experience may be substituted for a Degree.
Security + Certification or will need to achieve within 90 days.
Must have an active Secret clearance and the ability to obtain a TS/SCI
Minimum of 12+ years of experience designing and developing large integrated classified systems.
Minimum of 10+ years of experience leading development teams.
Possess a solid understanding of secure systems architecture and development.
Proven professional experience analyzing code for weaknesses and errors, and overseeing plans to improve them.
Must be comfortable working on multiple systems and components simultaneously in various configurations.
Experience with code development software tools to include: JetBrains CLion, Visual Studio Code, Git and Gitlab Enterprise (repository hosting).
Experience with build and deployment (CI/CD) to include: GitLab Enterprise (CI/CD), CMake and vcpkg.
Experience with application software stacks to include: Qt/QML, C++17, SQLite, NNG and Google Protocol Buffers
Experience with Testing and Quality Assurance to include: Catch2, Clang-Format, CPPLint, FlawFinder, Valgrind and Clang-Tidy.
Experience with database management software, such as MySQL, Oracle RDBMS, and Microsoft SQL Server.
Scripting skills with knowledge of programming languages, such as Perl, Ruby, and Python.
Must be able to effectively plan and prioritize tasking and communicate clearly regarding technical options and trade-offs.
Must be capable of performing systems architecture activities in support of Agile/SCRUM teams.
Desired Qualifications:
Good knowledge of networking protocols, such as TCP, IP, and OSI models.
Understanding of Cryptography
Familiarity with SKLs and ECUs
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:May 11, 2026For 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.
Skills Required
- Bachelor's Degree in Computer Science, Software Engineering, or Information Systems
- at least 12+ years of related experience or Master's Degree with at least 10+ years of relevant experience
- Security + Certification or will need to achieve within 90 days
- Must have an active Secret clearance and the ability to obtain a TS/SCI
- Minimum of 12+ years of experience designing and developing large integrated classified systems
- Minimum of 10+ years of experience leading development teams
- Solid understanding of secure systems architecture and development
- Proven professional experience analyzing code for weaknesses and errors
- Experience with code development software tools
- Experience with build and deployment CI/CD tools
- Experience with application software stacks
- Experience with Testing and Quality Assurance tools
- Experience with database management software
- Scripting skills with programming languages such as Perl, Ruby, and Python
- Must be able to effectively plan and prioritize tasking
- Must be capable of performing systems architecture activities in support of Agile/SCRUM teams
Leidos Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Leidos and has not been reviewed or approved by Leidos.
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Healthcare Strength — Healthcare coverage is described as comprehensive, with multiple plan options, low office-visit copays in some plans, and access to mental health and wellness support tools. The availability of HSA/FSA options and employer contributions is positioned as a meaningful part of the total package.
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Retirement Support — Retirement benefits are framed as a strong component of total rewards, highlighted by a 401(k) match and immediate vesting in the standard package. The Employee Stock Purchase Plan is also presented as an additional long-term wealth-building feature.
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Wellbeing & Lifestyle Benefits — Wellbeing and lifestyle supports extend beyond core insurance, including wellness programs, fitness-related stipends, and assistance resources. Work flexibility and related perks are also included as part of the broader rewards experience.
Leidos Insights
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. Your most important work is ahead.
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