Junior Security Engineer

leidos· 00100 LEIDOS, INC.
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📍 Bethesda, MDFull time💰 USD 70K–126K

About this role

General program information and/or position overview.


Leidos is seeking a Junior Security Engineer to support day-to-day security activities across enterprise and isolated environments. This position will provide hands-on support for security operations, vulnerability management, RMF/ATO activities and continuous monitoring.


The individual will work closely with senior security personnel, system administrators, engineers and other technical teams to implement security requirements, identify and remediate security issues and maintain the overall security posture of the environment.


This position provides an opportunity to develop across multiple areas of cybersecurity, including vulnerability management, security engineering, RMF/ATO, system hardening and continuous monitoring. The individual will be given opportunities to take on increased technical responsibility as their knowledge and experience grow.


This is a 100% on-site position. All work must be performed at the customer site.


Primary 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.

Basic Qualifications

  • 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)

Education/Experience Requirements

  • Bachelor's degree with at least 2 years of relevant experience. Additional years of experience may be considered in lieu of degree.

Clearance

  • 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.

Preferred Qualifications

  • CISSP or CASP Certification

#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:

September 14, 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 $69,550.00 - $125,725.00

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.

Frequently Asked Questions

What is the salary for the Junior Security Engineer role at leidos?
The listed salary for this Junior Security Engineer position at leidos is USD 70K–126K. This is an Full time role.
Where is the Junior Security Engineer position at leidos located?
This Junior Security Engineer role at leidos is based in Bethesda, MD. The position is listed as on-site or hybrid. Check the full job description or apply directly to confirm the work arrangement.
Is the Junior Security Engineer role at leidos full-time or part-time?
This is listed as a Full time position. It is posted as a Junior Security Engineer role in the 00100 LEIDOS, INC. department at leidos.
Which team or department does the Junior Security Engineer at leidos belong to?
This Junior Security Engineer position is part of the 00100 LEIDOS, INC. department at leidos. See the full job description for more information about the team structure and responsibilities.
How do I apply for the Junior Security Engineer position at leidos?
Click the "Apply Now" button on this page. You will be redirected to leidos's official application portal hosted on workday where you can submit your application directly.
When was the Junior Security Engineer job at leidos posted?
This Junior Security Engineer position at leidos was posted on Sep 25, 2026. Apply as soon as possible — early applications are often reviewed first.
Junior Security Engineer
leidos · 💰 USD 70K–126K
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