Cyber Security Engineer

Leidos has an exciting opening for you, our next TS/SCI Cyber Security Engineer working across several Task Orders under the DOMEX Technology Platform (DTP) contract supporting NMEC. Have impact as part of a mission focused, solutions oriented, and adaptive team that values innovation, collaboration, and professional development. As a Cyber Security Engineer, your job will be to design, develop, and implement secure systems in on-premises infrastructure. You will leverage on your experience with security technologies and industry best practices to ensure that security is integrated into system design, development, testing, and deployment and that all security requirements are compliant with the DoD Risk Management Framework. This exciting and challenging work will help you expand your capabilities in security and will provide you with the skills and experience you need to achieve additional levels of the DoD 8570 IAT and IASAE Certifications. While most work is conducted on-site at our client location in Bethesda, MD, we offer a flexible schedule and, occasionally, some tasks may be performed remotely. Percentage of remote work will vary based on client requirements/deliverables. In this role, you will collaborate closely with ISSOs, ISSSMs, software engineers, software developers, system engineers and Government counterparts to perform the full spectrum of systems and cyber security engineering tasks to ensure our systems meet a variety of regulatory compliance frameworks. Key Tasks include the following: Support the secure architecture, design, and implementation of DoD systems in accordance with DoDI 8510.01, NIST SP 800-53, and other DoD security guidance. Lead the integration of RMF activities into the system development lifecycle (SDLC), including selecting, implementing, and validating security controls. Develop and maintain key security documentation such as System Security Plans (SSPs), Security Assessment Reports (SARs), Risk Assessments, and Plan of Action and Milestones (POA&Ms). Collaborate with ISSOs, ISSMs, developers, and system owners to ensure systems are developed and maintained with approved security configurations. Apply Security Technical Implementation Guides (STIGs) to systems and validate compliance using tools such as SCAP, STIG Viewer, and ACAS. Maintain application, network, and database scanning infrastructure (application/product updates, database maintenance, benchmark/audit files, application/server builds, rule pack/content updates, scanner, or agent deployment etc.) Analyze vulnerability scans and ensure timely mitigation or acceptance of risks based on DoD policies. Provide technical input to support and maintain system authorization. Participate in system reviews, architecture assessments, and engineering design reviews to embed cybersecurity from the outset. Develop and implement automation or security tools to improve the compliance and monitoring of systems. Support security incident response and forensics analysis in coordination with ISSMs and Security points of contact. Requirements: BS degree and 4-8 years of experience in cybersecurity. Additional relevant years of experience in lieu of degree is accepted. An active TS/SCI clearance with ability to obtain a Poly Have at least one of the following DoD 8570.01-M IASAE Level II certifications: CISSP, CISSP-ISSAP, CISSP-ISSEP, CSSLP, or CASP+ CE. NOTE: the CISSP Associate is not acceptable Developer experience is preferred in a least one scripting / programming language. Experience with reviewing cybersecurity vulnerabilities for risk and relevance as well as in vulnerability mitigations/remediation planning, for identified systems, network, application and database vulnerabilities Ability to architect, design, troubleshoot, maintain, and deploy vulnerability scanning solutions such as (OWASP, Fortify, Sonarqube, Tenable, etc.) Experience with XACTA, EMass, or similar tool Strong in-depth understanding of including Microsoft Windows and Linux/UNIX operating systems Experience with middleware / web technologies (Apache, tomcat, IIS, etc.) Experience with Databases (Postgres, MS SQL, MySQL, ElasticSearch, etc.) Understanding of TCP/IP networking. Experience with Continuous Integration and Continuous Delivery Platforms (Jenkins, Bamboo, GitlabCI TFS, etc.) Familiar with NIST 800-171, 800-172, NIST SSDF, and CMMC requirements. Experience with NIST Special Publications e.g. NIST SP 800-27, 30, 37, 53, 60, 171, NIST SSDF, CMMC requirements, and CNSS publication CNSSI 1253 Experience supporting DoD/IC systems through the entire Risk Management Framework Plus (RMF) process Experience establishing a System Security Engineering management process to integrate security and privacy controls into complex hardware and software systems Experience developing and reviewing security concept of operations, systems security plans, security risk assessments, contingency plans, configuration management plans Experience with incident response plans, plan of actions and milestones, risk management plans, and vulnerability management plans Strong communication skills; able to successfully communicate with management personnel, technical personnel and third parties. You will wow us even more if you have these skills: Software development/coding experience with programming languages such as Python, Java, and React Successfully achieved ATO under RMF+ Experience with big data applications Experience with tools for ticketing and documentation (e.g., Gitlab, Jira, Confluence). Experience working in an Agile environment Experience with OIDC or Oauth2 Experience with any of the following technologies: Kubernetes, Rancher, Strimzi, or Cloudera Active Directory Scripting languages like bash, python, or PowerShell #NMECDTP-Leidos 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: July 30, 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 $87,100.00 - $157,450.00 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.