Lead Firewall Engineer

Si Tec Consulting; West Springfield (VA); On-site; USD 150,000 - 210,000; Full time

Job summary

Si Tec Consulting seeks a Lead Firewall Engineer to spearhead enterprise firewall operations, engineering, compliance, and modernization. You will provide technical direction, oversee complex troubleshooting, and ensure secure, reliable network performance.

Requirements include an active TS/SCI clearance with CI polygraph, 8+ years in network security, and advanced experience with Palo Alto, Juniper SRX, and F5. Occasional after-hours work may be required.

Qualifications

• Active TS/SCI clearance with CI polygraph.
• 8+ years of network security on large enterprise networks.
• Experience leading a firewall or boundary security team.
• Advanced experience with Palo Alto, Juniper SRX, and F5.
• Strong knowledge of TLS/SSL, PKI, Kerberos, LDAP, SAML and OAuth.
• DoD 8140/8570 IAT Level II certification.
• CSSP Infrastructure Support certification within 120 days.
• Occasional evening or weekend availability.

Responsibilities

• Lead daily firewall operations, maintenance, troubleshooting, and project execution.
• Design and implement solutions using Palo Alto, Juniper SRX, and F5 technologies.
• Review network changes and assess operational and security impacts.
• Maintain secure configuration baselines, architecture diagrams, inventories, procedures, and documentation.
• Monitor performance, logs, software versions, and configuration drift.
• Lead compliance reviews, technical evaluations, and modernization efforts.
• Brief stakeholders and mentor engineering personnel.

Skills

TS/SCI clearance

CI polygraph

8+ years in security

Firewall leadership

TLS/SSL knowledge

Education

Bachelor's or Master's in CS/Cybersecurity

Tools

Palo Alto

Juniper SRX

F5

Job description

Lead Firewall Engineer

Clearance: Active TS/SCI
Experience: 8+ years

Lead an enterprise boundary security team responsible for firewall operations, engineering, compliance, and modernization. You will provide technical direction, oversee complex troubleshooting, and support secure, reliable network performance.

What You Will Do

• Lead daily firewall operations, maintenance, troubleshooting, and project execution.
• Design and implement solutions using Palo Alto, Juniper SRX, and F5 technologies.
• Review network changes and assess operational and security impacts.
• Maintain secure configuration baselines, architecture diagrams, inventories, procedures, and technical documentation.
• Monitor performance, logs, software versions, and configuration drift.
• Lead compliance reviews, technical evaluations, and modernization efforts.
• Brief stakeholders and mentor engineering personnel.

What You Bring

• Active TS/SCI clearance with the ability to obtain and maintain a CI polygraph.
• At least eight years of network security experience, including five years supporting large enterprise networks.
• Experience leading a firewall or boundary security team.
• Advanced experience with Palo Alto, Juniper SRX, and F5 platforms.
• Strong knowledge of firewall policy, TLS/SSL, PKI, Kerberos, LDAP, Active Directory, SAML, OAuth, and network architecture.
• Experience with network design, implementation, cost estimates, and labor estimates.
• Current DoD 8140/8570 IAT Level II certification.
• Ability to obtain CSSP Infrastructure Support certification within 120 days.
• Availability for occasional evening or weekend work.

Preferred Qualifications

• Bachelor's or master's degree in computer science, cybersecurity, network security, or a related field.
• F5, Juniper, or Palo Alto professional certification.