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Leidos
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September 20, 2026
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Junior Security Engineer

Silver Spring, MD
Full-time
Onsite
$70K/yr - $126K/yr
Entry Level
Leidos is a technology and engineering company serving government and commercial customers. The company is seeking a Junior Security Engineer to support security operations, vulnerability management, RMF/ATO activities, system hardening, and continuous monitoring across enterprise and isolated environments.
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Responsibilities

  • Perform day-to-day security activities under the direction of senior security personnel and escalate risks, technical issues and blockers as appropriate
  • Support vulnerability management activities from identification through closure, including analysis, remediation, validation and documentation
  • Perform vulnerability scanning and analyze findings using ACAS, Tenable/Nessus or equivalent technologies
  • Work with Windows, Linux, network, desktop support and other engineering teams to assist with vulnerability remediation and security-related technical issues
  • Implement and validate DISA STIGs and approved security configuration baselines across infrastructure systems
  • Perform recurring security activities, including audit log reviews, account reviews, vulnerability reviews, security control validation and continuous monitoring
  • Support RMF/ATO activities, including security documentation, control evidence, Body of Evidence (BoE), POA&Ms and compliance with NIST SP 800-53, ICD 503 and applicable security directives
  • Assist with reviewing system and configuration changes for potential security impact and document findings for review by senior security personnel and the ISSM
  • Support security activities for isolated or restricted environments, including vulnerability scanning, logging, patching, hardening and security monitoring
  • Review security logs and events using Splunk or equivalent SIEM/log-management technologies and escalate identified issues as appropriate
  • Assist with maintaining security procedures, documentation, compliance evidence and vulnerability remediation records
  • Track assigned security findings, remediation activities and action items through completion and provide status updates as required
  • Participate in security reviews, engineering meetings and Technical Exchange Meetings (TEMs) as required
  • Research security vulnerabilities, technical requirements and remediation approaches and provide findings and recommendations to senior security personnel
  • Develop technical knowledge across the environment and take on increased responsibility for security activities as experience and proficiency grow

Qualification

Required

  • Experience with application performance and latency problems related to security requirements from front, middle, and back end
  • Working experience with Windows Server 2016/2019, Active Directory, IIS, DNS, DHCP, Exchange, DFS
  • Experience implementing security controls on common network services such as file, email, and active directory across multiple geographically dispersed sites
  • Experience with networking technologies and security assessment to include, but not limited to, STIGs
  • Experience implementing and supporting enterprise system security and malware monitoring and prevention tools such as Splunk, McAfee HBSS, and ACAS
  • Solid network and systems troubleshooting experience with TCP/IP, Internet security, and encryption (data at rest, data in transit)
  • Ability 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)
  • Bachelor's degree with at least 2 years of relevant experience. Additional years of experience may be considered in lieu of degree
  • 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
  • This is a 100% on-site position. All work must be performed at the customer site

Preferred

  • CISSP or CASP Certification

Benefits

  • Health and Wellness programs
  • Income Protection
  • Paid Leave
  • Retirement
Leidos is an industry and technology leader serving government & commercial customers with smarter, more efficient digital and mission innovations.
Glassdoor
3.9
Founded in 1969
Reston, Virginia, USA
10001+ employees
https://www.leidos.com
Leidos is an industry and technology leader serving government & commercial customers with smarter, more efficient digital and mission innovations.
Glassdoor
3.9
Founded in 1969
Reston, Virginia, USA
10001+ employees
https://www.leidos.com