Firewall Engineer

Tier 3 Network Security Engineer

This position requires a highly skilled Tier 3 Network Security Engineer specializing in Cisco Secure Firepower Firewalls. The role involves supporting an enterprise-scale Managed Network Services environment for a government agency, focusing on advanced troubleshooting, operational support, and change management. The engineer will work in a remote capacity, collaborating with internal teams to ensure the security, reliability, and performance of the firewall infrastructure.

Responsibilities

• Serve as a Tier 3 escalation point for complex firewall and network security issues.
• Conduct advanced troubleshooting and root cause analysis for Cisco Secure Firepower Firewall incidents.
• Support daily firewall operations using Cisco Secure Firewall Management Center (FMC), including monitoring health, performance, and traffic flows.
• Analyze and optimize firewall access control and security policies.
• Support routing protocols within secure network environments.
• Troubleshoot and support VPN technologies, including site-to-site and remote access VPNs.
• Participate in formal change management processes, including documentation, peer reviews, and scheduled implementations.
• Execute authorized changes during designated after-hours change windows.
• Engage in team-based on-call rotations to support after-hours and emergency incidents.
• Collaborate with engineering and operational teams to meet Managed Network Services contractual obligations.

Qualifications

• Extensive hands-on experience with Cisco Secure Firepower Firewalls.
• Strong troubleshooting skills, including traffic flow analysis, NAT/PAT configuration, and inspection of security policies.
• Operational expertise in Cisco Secure Firewall Management Center (FMC).
• Proven experience troubleshooting VPN technologies such as Cisco AnyConnect.
• Deep understanding of OSI Layers 1–4, with knowledge extending to Layers 5–7.
• Ability to analyze and support security intelligence policies and access rules.
• Familiarity with Cisco Catalyst SD-WAN is advantageous.
• Experience working in large-scale enterprise or government environments.
• Effective verbal and written communication skills for technical documentation and team collaboration.
• Availability to work mostly remotely, including participation in after-hours maintenance and on-call rotations.
• In compliance with federal law, all persons hired must verify their identity and eligibility to work in the United States and complete the required employment eligibility verification form upon hire. Candidates must be legally authorized to work in the United States without employer sponsorship, now or in the future.

Publishing Pay Range: $50.00 – $60.00 USD Hourly This position is based in remote work and can be performed from an approved location.

At GDH, we believe in the power of people and the importance of caring. Our culture statement, "We care about people," isn't just a tagline – it's the core of everything we do. GDH is a premier staffing and talent solutions company dedicated to helping businesses find the best talent and assisting job seekers in finding their dream jobs.

GDH, founded in 2001, has grown into a leader in providing staffing solutions across various industries. We specialize in IT across several sectors, connecting top talent with leading enterprises. As a Best of Staffing firm recognized for excellence in client, employee, talent, and women's services, we pride ourselves on our commitment to quality and service.

GDH offers a range of employee benefits that are designed to promote well-being and help maintain a healthy work-life balance. These comprehensive benefits cover various aspects of an employee's life and aim to enhance their overall experience with the company. Our health benefits include three medical insurance options with access to KISx Card, Zero Card, and HealthJoy concierge services. Other plan offerings include dental, vision, life, disability, supplemental insurance, and pet insurance plans. Enjoy additional perks like holiday pay, 401(k) plan, direct deposit, an employee referral program, work-life balance benefits, a Wellbeats membership, a discounted gym membership program, and more! For more detailed information on benefits, please go to GDH's website under the tab for candidates.

GDH provides equal employment opportunities (EEO) to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, gender, sex (including pregnancy), sexual orientation, gender identity, national origin, age, disability, genetic information, marital status, ancestry, protected veteran status, military or uniformed service member status, or any other status or characteristic protected by applicable federal, state, and local laws. Applicants with disabilities who require an accommodation or assistance in applying and/or for interviewing, please contact our HR Department.

Please visit our notice of collection for California applicants.