Senior Network Engineer (Squid Proxy & Palo Alto Security)

CBSbutler; Sevenoaks; Hybride; GBP 124 000 - 163 000; Plein temps

Résumé du poste

CBSbutler Holdings Limited trading as CBSbutler in Kent is seeking an experienced Network Architect / Senior Network Engineer to secure enterprise networks with Squid Proxy and Palo Alto NGFWs. The role combines hands-on proxy and firewall administration with policy management and performance optimisations.

You will design, deploy and maintain Squid Proxy environments, manage Palo Alto firewalls and Panorama, and implement App-ID, User-ID and URL filtering to enforce rigorous security controls.

Qualifications

• 5+ years' experience supporting enterprise network infrastructure.
• Hands-on admin with Palo Alto firewalls.
• Experience configuring Palo Alto App-ID security policies.
• Extensive Squid Proxy experience with ACLs and SSL inspection.
• Experience with Palo Alto Panorama, User-ID, URL filtering and Threat Prevention.

Responsabilités

• Design, implement, configure and support enterprise Squid Proxy environments, including forward, reverse and transparent proxy deployments.
• Administer and optimise Palo Alto Next-Generation Firewalls, including Panorama management.
• Develop and maintain granular firewall security policies using Palo Alto App-ID, User-ID and Content-ID technologies.
• Configure and manage URL filtering, Threat Prevention, WildFire, GlobalProtect and SSL decryption.
• Manage proxy ACLs, authentication integrations, SSL inspection and web filtering policies.
• Review and optimise firewall rule bases, transitioning legacy port-based rules towards application‑aware security policies.
• Troubleshoot complex network and application connectivity issues across Layers 2-7.
• Perform packet analysis using tools such as Wireshark and tcpdump.
• Support firewall and proxy upgrades, migrations, patching and high‑availability configurations.
• Work alongside Cyber Security teams to support vulnerability remediation, incident investigations and security compliance activities.

Connaissances

Network architecture

Security policy management

TCP/IP networking

Troubleshooting

SSL inspection

Outils

Palo Alto firewalls

Palo Alto Panorama

Squid Proxy

App-ID

Wireshark

tcpdump

GlobalProtect

SSL decryption

Description du poste

Network Architect - Squid Proxy & Palo Alto

Kent / Hybrid - 2 days per week onsite

Up to £780 per day inside ir35

Active SC clearance - Sole UK National

We are seeking an experienced Network Architect / Senior Network Engineer with strong hands‑on expertise in Squid Proxy, Palo Alto Next-Generation Firewalls (NGFW) and App-ID technologies to support and enhance secure enterprise network infrastructure.

This is an excellent opportunity for a technically strong network security specialist to take ownership of critical proxy and firewall services, focusing on secure web access, application visibility, security policy management and network optimisation.

Key Responsibilities

• Design, implement, configure and support enterprise Squid Proxy environments, including forward, reverse and transparent proxy deployments.
• Administer and optimise Palo Alto Next-Generation Firewalls, including Panorama management.
• Develop and maintain granular firewall security policies using Palo Alto App-ID, User-ID and Content-ID technologies.
• Configure and manage URL filtering, Threat Prevention, WildFire, GlobalProtect and SSL decryption.
• Manage proxy ACLs, authentication integrations, SSL inspection and web filtering policies.
• Review and optimise firewall rule bases, transitioning legacy port-based rules towards application‑aware security policies.
• Troubleshoot complex network and application connectivity issues across Layers 2-7.
• Perform packet analysis using tools such as Wireshark and tcpdump.
• Support firewall and proxy upgrades, migrations, patching and high‑availability configurations.
• Work alongside Cyber Security teams to support vulnerability remediation, incident investigations and security compliance activities.

Essential Skills & Experience

• 5+ years' experience supporting enterprise network infrastructure.
• Strong hands‑on administration and support experience with Palo Alto Networks firewalls.
• Demonstrable experience configuring and managing Palo Alto App‑ID security policies.
• Extensive experience with Squid Proxy, including ACLs, SSL inspection and authentication.
• Experience with Palo Alto Panorama, User-ID, URL filtering and Threat Prevention.
• Strong understanding of TCP/IP, routing, VLANs, DNS, DHCP, NAT and VPN technologies.
• Experience troubleshooting SSL/TLS, authentication and application connectivity issues.
• Proficiency with network analysis tools such as Wireshark and tcpdump.
• Experience working within highly secure, regulated or business‑critical environments.

Desirable Experience

• Experience within Defence, Government or Critical National Infrastructure (CNI).
• Experience supporting secure customer environments.
• Knowledge of network segmentation and Zero Trust security principles.
• Experience with infrastructure automation using Python or Ansible.
• Familiarity with monitoring platforms such as Splunk, SolarWinds, ELK or Grafana.

If you have strong hands‑on experience with Squid Proxy and Palo Alto firewalls, particularly App-ID and application‑aware security policy management, we would be keen to hear from you.