Junior Security Engineer: Vulnerability & RMF/ATO

Leidos; Bethesda (MD); On-site; USD 70,000 - 126,000; Full time

Job summary

Leidos in Bethesda, MD is seeking a Junior Security Engineer to support day-to-day security operations across enterprise and isolated environments. You will assist with vulnerability management, RMF/ATO activities and continuous monitoring, working closely with senior security personnel and system teams.

This on-site role offers hands-on experience across DISA STIGs, security tooling such as ACAS and Splunk, and the opportunity to grow into broader security responsibilities as you demonstrate

Qualifications

• Bachelor's degree in a related field with relevant experience.
• Experience implementing vulnerability management and security monitoring.
• Familiarity with Windows server environments and security controls.

Responsibilities

• Perform day-to-day security activities under senior guidance.
• Support vulnerability management from identification to closure.
• Perform vulnerability scanning with ACAS/Nessus and analyze findings.
• Collaborate with Windows/Linux/network teams to remediate issues.
• Implement and validate DISA STIGs and security baselines.
• Support RMF/ATO activities with evidence and documentation.
• Review changes for security impact and document findings.
• Monitor isolated environments for security and patching.
• Review logs with SIEM tools and escalate issues.

Skills

Vulnerability management

Security operations

RMF/ATO

Documentation

Cross-team collaboration

Education

Bachelor's degree in a related field

Tools

ACAS/Nessus

Splunk

McAfee HBSS

DISA STIGs

Active Directory

Windows Server 2016/2019

Job description

Leidos in Bethesda, MD is seeking a Junior Security Engineer to support day-to-day security operations across enterprise and isolated environments. You will assist with vulnerability management, RMF/ATO activities and continuous monitoring, working closely with senior security personnel and system teams.

This on-site role offers hands-on experience across DISA STIGs, security tooling such as ACAS and Splunk, and the opportunity to grow into broader security responsibilities as you demonstrate