Firewall Engineer

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

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.

• 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.

• Minimum 5 years of hands‑on experience in firewall engineering or network security roles.
• Strong expertise in Fortinet (Forti Gate) 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.