Network Security Engineer (Endpoint & Browser Isolation)/Hybrid/London

We are seeking an experienced Network Security Engineer to join an Endpoint Security team within a leading global financial services firm. This is a high-level operational (BAU) role focused on supporting and troubleshooting a Menlo Security browser isolation solution.

The successful candidate will act as a technical point of escalation for complex support tickets, ensuring seamless secure web browsing for end-users. You will investigate the entire transaction path-from the desktop icon to the Firewall-to resolve connectivity and performance issues.

Core Responsibilities

• Operational Support: Provide L2/L3 support for the browser isolation environment, investigating and resolving tickets where users cannot connect to or use the secure browsing service.
• Network & Firewall Management: Carry out necessary changes to Firewalls and network equipment to resolve identified connectivity issues.
• Incident Diagnosis: Troubleshoot the full transaction life cycle, identifying whether faults lie within the local network, the isolation layer, or the web application architecture.
• Collaboration: Work closely with security analysts and wider infrastructure teams to maintain compliance with security policies.
• Documentation: Develop and maintain technical documentation for network configurations and troubleshooting processes.

Technical Requirements

Network Expertise (Advanced): Proficient in configuring and managing Routers, Switches, and Firewalls. Deep understanding of TCP/IP, DNS, DHCP, VLANs, and VPNs.

Web Architecture Knowledge: Intermediate understanding of HTML, CSS, and JavaScript is required to diagnose browser behaviour and identifies issues within the isolation environment.

Security & Isolation: Experience with Menlo Security or similar browser isolation/Proxy products (eg, Zscaler, Symantec BlueCoat).

Automation & Scripting: Ability to work within a highly automated environment; Scripting skills (Python/Bash) are beneficial for identifying issues.

Troubleshooting: Strong analytical skills to resolve complex L2/L3 issues that cannot be handled by a standard helpdesk.

Desirable Attributes

Sector Experience: Previous experience working within the financial services sector.

Certifications: CCNA, CCNP, or equivalent networking/security certifications.

Communication: Ability to explain technical resolutions clearly to stakeholders and document changes effectively.

Notes: Site location is London (London Wall) - Hybrid (3 days on-site, 2 days remote) Rate: £470 per day (Inside IR35) Duration: 12 Months Start Date: ASAP.