Hiring: Senior Security Engineer Company: Leidos Location: Bethesda, MD Job Posted Time: 2026-09-15 10:19:10 Employment Type: On-site Target Skills & Keywords : DNS, Encryption, Linux, REST, SIEM, Splunk, TCP/IP, Windows Server About the job Experience: •Candidate must have a Bachelor's, with at least 8 years of relevant experience. Additional years of experience may be considered in lieu of degree. •8 years of relevant experience. Additional years of experience may be considered in lieu of degree. •At least 8 years of relevant experience. Additional years of experience may be considered in lieu of degree. Required Skills: •General program information and/or position overview. •Leidos is seeking a Senior Security Engineer to serve as the technical lead for day-to-day security activities supporting enterprise and isolated environments. This position will provide technical leadership and oversight for security operations, vulnerability management, RMF/ATO support and continuous monitoring activities. •The individual will lead and mentor security personnel, establish priorities and coordinate security activities across infrastructure and engineering teams. This is a hands-on technical lead position, and the individual will be expected to directly support security engineering and operational security activities as needed. •The individual will work closely with the ISSM, customer, program leadership and technical teams to translate security requirements into actionable work and maintain the overall security posture of the environment. •This is a 100% on-site position. All work must be performed at the customer site. •Lead and coordinate day-to-day security operations, establish priorities and assign and track activities across the security team. •Provide technical leadership and guidance to security personnel, system administrators, engineers and other technical teams. •Lead vulnerability management from identification through closure, including analysis, prioritization, remediation, validation and documentation. Qualifications: •Bachelor’s degree in Computer Science, Information Technology, or a related field, or equivalent work experience. •Working experience with Windows Server 2016/2019, Active Directory, IIS, DNS, DHCP, Exchange, DFS •Solid network and systems troubleshooting experience with TCP/IP, Internet security, and encryption (data at rest, data in transit) •Demonstrated capacity to produce clear and concise documents and diagrams capturing networking and operational procedures and LAN/WAN topology using MS Visio, MS Project, MS Excel and MS Word. •Candidate must, at a minimum, meet DoD 8570.11- IAT Level II certification requirements (currently Security+ CE, CCNA-Security, GSEC, or SSCP along with an appropriate computing environment (CE) certification) •Active TS/SCI clearance with Polygraph required OR active TS/SCI and willingness to get a Poly. •US Citizenship is required due to the nature of the government contracts we support. •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. Compensation: •$107,900 - $195,050 / year Interested candidates, please apply directly through the job posting on company's career page or try via AI auto apply on this platform. Don't miss this opportunity to join a forward-thinking team!