Firewall Engineer Riverdale Park, MD

Firewall Engineer job erdale Park, MD.

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. It 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 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).

• Active DoD Secret security clearance with the capability to obtain TS/SCI; a TS/SCI clearance is preferred.
• DoD 8570 IAT II or higher certification (Security+ CE or equivalent) required prior to start.
• Juniper, Cisco, or Palo Alto certification required 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 of perimeter and internal firewall implementation (both physical and virtual contexts).
• Advanced experience managing baseline configuration across numerous firewalls.
• Advanced experience evaluating rules to ensure maximum security while minimizing redundancy.

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 agencies to meet mission and business requirements. Our cybersecurity team performs cyber‑defensive actions to prevent, detect, respond, and recover from adversarial activities.

We value innovation and high performance. Join us to work on cutting‑edge technology and support critical national security missions.

November 10, 2025 – For U.S. positions: this requisition will remain open for at least 3 days after posting with an anticipated close date no earlier than 3 days after the posting date.

Pay Range: $ – $

Employment benefits include competitive compensation, health and wellness programs, income protection, paid leave, and retirement.

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, 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.