Firewall Engineer

Whitehall Resources; South Yorkshire; On-site; GBP 50,000 - 70,000; Full time

Job summary

Whitehall Resources is looking for an experienced Firewall Engineer to join their team in South Yorkshire for an initial 6-month contract. In this role, you will design, implement, and support enterprise network security solutions, focusing on Fortinet and Juniper firewalls. Responsibilities include providing Level 3 support, troubleshooting complex issues, and ensuring compliance with security standards. The ideal candidate will have at least 5 years of experience and strong hands-on expertise in firewall engineering.

Qualifications

• Minimum 5 years of hands-on experience in firewall engineering or network security roles.
• Strong expertise in Fortinet (FortiGate) and Juniper (SRX) technologies.
• Solid understanding of L3/L4 networking concepts, routing, and traffic flow.

Responsibilities

• Design, implement, and support Fortinet and Juniper firewall platforms.
• Provide L3 support for firewall-related incidents and complex service requests.
• Troubleshoot advanced network and security issues across enterprise environments.

Skills

Firewall engineering experience

Fortinet (FortiGate) expertise

Juniper (SRX) expertise

L3 support capabilities

Troubleshooting skills

Analytical skills

Job description

Whitehall Resources are currently looking for Firewall Engineer based in South Yorkshire for an initial 6 -month contract.

Job Spec

We are seeking an experienced Firewall Engineer to join the Firewall Engineering team, responsible for designing, implementing, and supporting enterprise network security solutions. The role requires strong hands‑on expertise with Fortinet and Juniper firewalls and the ability to operate at Level 3 (L3) support within a complex enterprise environment.

***INSIDE IR35***

Main responsibilities

• Design, implement, and support Fortinet and Juniper firewall platforms.
• Provide L3 support for firewall‑related incidents, problems, and complex service requests.
• Troubleshoot advanced network and security issues across enterprise environments.
• Manage firewall rulebases, NAT policies, security zones, and objects in line with security standards.
• Support firewall changes, upgrades, patching, and migrations.
• Perform root‑cause analysis and drive permanent fixes for recurring issues.
• Collaborate with network, security, and infrastructure teams to ensure secure connectivity.
• Ensure compliance with internal security policies and regulatory requirements.
• Maintain accurate documentation, configurations, and operational procedures.
• Participate in on‑call rotas and provide out‑of‑hours and weekend support when required to support business‑critical services and incident resolution.

Key Skills

• Minimum 5 years of hands‑on experience in firewall engineering or network security roles.
• Strong expertise in Fortinet (FortiGate) and Juniper (SRX) technologies.
• Solid understanding of L3/L4 networking concepts, routing, and traffic flow.
• Proven experience providing L3 operational support in production environments.
• Strong troubleshooting and analytical skills.
• Ability to work effectively under pressure, including during major incidents.
• Experience working in regulated or enterprise environments (e.g. banking or financial services).
• Exposure to high‑availability designs, VPN technologies, and security best practices.