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The Defernse Sector at Leidos is seeking a cybersecurity engineer to collaborate with the Information System Security Engineer (ISSE) serving as a subject matter expert in advanced technical principles, theories, and concepts in Security Engineering, including operations, engineering, technical and program management support services, and RMF/ATO compliance to support cyber-related operations. Duties will include:
- Under the direction and guidance of the ISSM, capture and refine information security requirements and ensure their integration into information technology components and information systems through purposeful security design and configuration.
- Perform vulnerability assessments to determine weaknesses and exploit methods in systems/networks utilizing approved COTS and GOTS tools, in conjunction with security testing methodologies and frameworks to assess threats against information and system/networks and recommend appropriate countermeasures for continued mission assurance.
- Perform cybersecurity analysis, identification, and remediation of complex cybersecurity compliance requirements on IT systems and applications to include: Microsoft Windows and RHEL family of servers, workstations operating systems. RDBMS such as SQL and PostgreSQL, XML, and JSON-based semi-structured technologies. Web-Server and web application technologies (e.g., MS IIS, Apache/Tomcat, SharePoint). Virtualization technologies such as VMware and VDI infrastructures. Network infrastructure components such as switches, firewalls, vSANs, and thin client hardware.
- Responsible for administering and securing Windows environments, including WSUS, hardened Windows templates, Active Directory OUs and GPOs, and other Windows-based infrastructure and services.
- Provide remediation recommendations and mitigating strategies for vulnerabilities discovered and maintain in-depth knowledge of STIG/SRGs, technologies such as Tenable Nessus, SCAP compliance tools like EvaluateSTIG and other automated tools that assist with the assessment of security controls and the presentation of security assessment results.
- In coordination with change management processes, remediate, apply, and/or mitigate vulnerabilities to systems and system components through the application of security updates, patches, fixes, and/or secure configurations.
- Support the creation, development, and documentation of cybersecurity processes and procedures supporting Authorization to Operate (ATO) packages and, as needed, to mature the program’s cybersecurity posture.
- Experience with eMASS to manage ATO package
- Prepare and maintain security documentation, including System Security Plans (SSPs), Security Assessment Reports, and Plans of Action and Milestones (POA&Ms).
- Install, configure and manage Trellix products.
- Create, tune, and enforce security policies through the ePO console to meet company security standards and compliance requirements.
- Troubleshoot Splunk issues between server and forwarder, create custom dashboards and implement best practices.
- Administer, configure, and maintain the Tenable Security Center.
- Review ACAS results and remediate appropriately.
Basic Qualifications
- Bachelor’s degree in a related field and (5) five or more years of related actual work experience; additional work experience may be considered in lieu of a degree. (Unpaid experience will not be considered.)
- Active DoD Secret security clearance.
- Compliant with DoD 8140 requirements.
- DoD Risk Management Framework (RMF), especially in supporting Step 6.
- System/software design, enterprise architecture security, integration, testing, system administration, application administration, training, deployment, and O&M.
- Design, develop, and use host-based and network-based scanning tools.
- Security Content Automated Protocol (SCAP) based tools and specifications.
- Install, configure, test, deploy, and O&M of Enterprise-wide network-based cybersecurity tools (e.g., Trellix ESS, ACAS, Splunk, etc.) to support compliance testing and continuous monitoring.
- Supporting security engineering practices in the System/Software Development Life Cycle (SDLC) Process; General knowledge of the DoD and secure Information/LAN/WAN technologies.
- Hardening modern operating systems (OS) (i.e., RHEL, Microsoft Windows) and applications using Security Technical Implementation Guides (STIGs), Security Requirements Guides (SRGs), and/or industry best practices and documenting results on requisite checklists.
- Compiling and providing metrics to program management as needed.
- Presenting technical information to non-technical stakeholders.
Preferred Qualifications
Experience in the following:
- Working experience with ansible
- Experience working in a DoD environment with the ability to adapt and rapidly meet changing deadlines and obligations.
- Project Management experience in an agile scrum environment.
- CASP+/SecurityX or CISSP certification
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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:August 31, 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 a related field and five or more years of related work experience; additional experience may substitute for the degree
- Active DoD Secret security clearance
- Compliance with DoD 8140 requirements
- Experience with DoD Risk Management Framework, especially RMF Step 6
- Experience with security engineering, system and software design, enterprise security architecture, integration, testing, administration, deployment, and operations and maintenance
- Experience designing, developing, and using host-based and network-based scanning tools
- Experience with SCAP-based tools and specifications
- Experience installing, configuring, testing, deploying, and maintaining enterprise cybersecurity tools such as Trellix, ACAS, and Splunk
- Experience supporting security engineering practices within the SDLC and knowledge of DoD secure IT and LAN/WAN technologies
- Experience hardening RHEL, Microsoft Windows, and applications using STIGs, SRGs, or industry best practices
- Ability to compile metrics and present technical information to nontechnical stakeholders
- Working experience with Ansible
- Experience working in a DoD environment
- Project management experience in an Agile Scrum environment
- CASP+, SecurityX, or CISSP certification
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.
