Lead Firewall Engineer in Southeast

Job Description

Leidos' Digital Modernization sector is seeking a Senior Firewall Engineer to support the GSM‑O effort. This position is located at the Pentagon and is 100% on‑site. This role requires an engineer who can design, implement, and manage complex firewall solutions to ensure the security and integrity of network infrastructure. The ideal candidate has experience with firewall technologies including Cisco ASA, Juniper SRX, and Palo Alto, as well as a strong background in security networking.

• Design, implement, and manage firewall solutions using Cisco ASA/Firepower, Juniper SRX, and Palo Alto.
• Monitor firewall performance and security logs to identify and mitigate potential threats.
• Develop and enforce network security policies and procedures.
• Perform system audits to ensure compliance with standards and regulations.
• Collaborate with other IT, Security, and Network teams to integrate firewall solutions.
• Troubleshoot and resolve network and firewall‑related issues promptly and document within ticket systems.
• Maintain and update firewall configurations (security policies/firewall ACLs as approved by Change Management).
• Serve as a People Leader for personnel supporting the Firewall Task Area:
  • Serve as the focal point for all firewall tasks, operations, projects, and assessments.
  • Ensure all tasks are delivered according to timelines.
  • Provide written reports and oral briefings to the Government Task Lead and PMO Team.
  • Conduct annual performance assessments to include periodic check‑ins.
  • Validate/approve time charging for both Leidos and vendor personnel.
  • Provide coaching/mentoring to personnel.
  • Develop and execute continual service improvement technical strategies to modify and enhance operational processes and impact strategic project/program goals and business results.

• Must have, at minimum, an active DoD Top Secret security clearance with ability to obtain TS/SCI.
• Must have DoD 8570 IAT II or higher certification prior to start.
• Must have a Juniper, Cisco, or Palo Alto certification prior to start.

• BS degree and 12+ years of directly relevant experience. Additional military or relevant work experience may be considered lieu of a degree.
• 3+ years of firewall experience within the DoD environment.
• Demonstrated knowledge in planning, directing, and managing a firewall team in an organization similar in size to this acquisition.
• Demonstrated knowledge of implementation of perimeter and internal firewalls (both physical and virtual contexts).
• Demonstrated advanced experience in managing standard baseline configuration across numerous firewalls.
• Demonstrated advanced experience in evaluating rules to ensure maximum security while minimizing redundancy in rules.
• Demonstrated experience with researching and fielding new and innovative firewall technology.

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 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.

Pay Range: $ - $. 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 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.

Pay and benefits are fundamental to any career decision. Employment benefits include competitive compensation, health and wellness programs, income protection, paid leave and retirement. More details are available at

All qualified applicants will receive consideration for employment without regard to gender, race, color, national origin, citizenship, disability, medical condition, genetic information, family structure, marital status, ancestry, domestic partner status, sexual orientation, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.