Senior Network Security Engineer – Zscaler

Contract: Initial contract
Day Rate: Flexible / dependent on experience
IR35: Outside IR35
Location: Hybrid – 1–2 days per week in either Cambridge or Macclesfield (not both)
Start: ASAP

The Role

We are looking for an experienced Senior Network Security Engineer to join a major enterprise technology and security programme.

This is a hands-on position focused on designing, implementing and maintaining secure enterprise network infrastructure, with particular emphasis on Zscaler ZPA/ZIA, firewall technologies and network security architecture.

You will work within a large-scale enterprise environment, collaborating with infrastructure, security and wider technology teams to strengthen network security and support ongoing transformation initiatives.

Key Responsibilities

• Design and implement secure enterprise network architectures.
• Configure, manage and troubleshoot enterprise firewall technologies, including Palo Alto, Cisco or equivalent.
• Work extensively with Zscaler Private Access (ZPA) and Zscaler Internet Access (ZIA).
• Support the implementation and ongoing improvement of Zero Trust/network security solutions.
• Conduct security and vulnerability assessments and support remediation activities.
• Work with intrusion detection/prevention technologies and wider network security tooling.
• Monitor and analyse security events using SIEM platforms and support incident response.
• Collaborate with security and infrastructure teams around IAM and Network Access Control (NAC).
• Work within established enterprise ITSM, CMDB, governance and change processes.
• Support security compliance and audit requirements.