Security Infrastructure Engineer

Leidos Holding$107K — $195K *
Aerospace & Defense
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • Active DoD TS/SCI clearance required
  • DoD 8570 IAT II or higher certification (e.g., Security+ CE) required before starting
  • Bachelor's degree or 8+ years of relevant experience, including military service
  • At least 2 years of experience with cybersecurity tools, especially IDS/IPS
  • Hands-on experience with Windows and Linux operating systems and their command line interfaces

Responsibilities

  • Collaborate with teams to deploy and manage cybersecurity policies and tools
  • Manage high-priority tasks and respond to outages
  • Develop and enhance standard operating procedures for security infrastructure
  • Maintain detailed network and equipment diagrams
  • Ensure compliance with change control processes
  • Advise leadership on security infrastructure improvements
  • Brief stakeholders on security status and updates
  • Operate and maintain various cybersecurity capabilities across platforms

Benefits

  • Full-time position with mission-critical operations
  • Opportunity to work on-site in Alexandria, VA
  • Involvement in significant cybersecurity initiatives for the DoD
  • Chance to collaborate with a diverse team, including government counterparts
  • Career advancement potential in a specialized cybersecurity field
Full Job Description

As a Security Engineer on our team, you will operate and maintain network security infrastructure utilized by a team of cybersecurity analysts in support of 24x7x365 mission-critical operations. This position is located in Alexandria, VA and is fully on-site.

Primary Responsibilities:

  • Work with government counterparts, contractors, and internal team members to deploy and manage policies, rules, and signature sets on cybersecurity capabilities

  • Manage high-priority tasks and outages

  • Maintain, develop, and improve Security Infrastructure standard operating procedures and tactics, techniques, and procedures (TTPs)

  • Maintain complete and current network and elevation diagrams for all managed security equipment

  • Coordinate and comply with applicable change control boards and corresponding processes

  • Advise and strategize with government and program leadership on ways to improve the security infrastructure, requiring multi-dimensional problem solving and ingenuity with impact on multiple aspects of the mission

  • Provide briefings to program/project leadership, government leadership, and other internal stakeholders on security infrastructure status, updates/patches, issues, and/or upgrades

  • Operate and maintain cybersecurity capabilities to include IDS/IPS/Netflow/SIEM/Snort/Linux/Virtualizationetc

  • Ensure Compliance standards

Required Clearance and Certifications:

  • Must have an active DoD TS/SCI clearance

  • Must have DoD 8570 IAT II or higher certification (Security+ CE or equivalent) prior to start

  • Must obtain a DOD-8570 CSSP Infrastructure Support certification within 6 months of start

Required Qualifications:

  • Bachelor's degree and 8+ years of professional experience; additional military service and/or relevant work experience may be considered lieu of a degree

  • 2+ years of technical experience deploying and maintaining cybersecurity tools, especially IDS/IPS capabilities

  • Demonstrated experience with configuring, maintaining, and troubleshooting cybersecurity infrastructure and capabilities.

  • Demonstrated knowledge of network traffic and communications, including known ports and services.

  • Hands-on experience with the Windows and Linux operating system and their respective command line interfaces and scripting shells

Preferred Qualifications:

  • Experience with automation and orchestration frameworks (ex. Ansible, Puppet, Chef)

  • Deep technical understanding of core current cybersecurity technologies as well as emerging capabilities

  • Demonstrated understanding of the life cycle of cybersecurity threats (internal and external), attacks, attack vectors and methods of exploitation with an understanding of intrusion set TTPs

  • Motivated self-starter with strong written and verbal communication skills, and the ability to create complex technical reports on analytic findings

  • Familiarity or experience in Intelligence Driven Defense, Cyber Kill Chain methodology, and/or MITRE ATT&CK framework

  • Prior hands-on experience as a SOC analyst


About our Program:
Through the J6 Penetration Handling, Incident, System Health (PHISH) support services task order on the GSM-O contract, we provide IT products, services and solutions to the Pentagon and other DoD offices and agencies for them to meet mission and business requirements. Our Cybersecurity team performs cyber defensive actions in support of J6 to prevent, detect, respond and recover from adversarial activities.



Original Posting:
June 2, 2026

Pay Range:
Pay Range $107,900.00 - $195,050.00

The Leidos pay range for this job level is a general guideline onlyand 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.

About Leidos Holding

Leidos Holding Careers

Joining Leidos Holding presents an unparalleled opportunity to advance one's career with a leader in innovation and technology. The company offers a plethora of job opportunities aimed at fostering professional growth and development in a diverse and inclusive environment.

Explore Career Opportunities

Leidos Holding is actively seeking skilled professionals who are passionate about leveraging their expertise to drive innovation and leadership in their fields. With a variety of open positions, Leidos Holding provides a platform for individuals to challenge themselves in a dynamic work environment.

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At Leidos Holding, innovation is at the core of everything they do. Employees are encouraged to think creatively and push boundaries. The company supports this drive for innovation through comprehensive professional development and diversity training programs that are designed to enhance skills and foster leadership.

Commitment to Diversity and Inclusion

Leidos Holding is committed to creating a workplace where diversity is not only recognized but celebrated. With a culture that values and promotes diversity, Leidos Holding ensures that all team members have the opportunity to contribute, learn, and grow.

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For those starting their career, Leidos Holding offers internship programs that provide a robust foundation in the industry. Internships are a great way to develop essential skills, gain valuable work experience, and build professional networks.

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Employees at Leidos Holding enjoy a range of benefits designed to support their professional and personal lives. The company culture is built on a foundation of respect and integrity, providing a supportive and collaborative environment where every team member is valued.

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