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# Network Security Engineer

- **Company:** Wwt Emea Uk Limited
- **Location:** Manchester, United Kingdom (Remote available)
- **Contract:** Temporary contract
- **Skills:** Border Gateway Protocol, Domain Name System (DNS), Python (Programming Language), Network Security, Public Key Infrastructure, Ansible, TCP/IP, Transport Layer Security, Load Balancing, Terraform, Big Ip, Vmware
- **Published:** October 30, 2026
- **Apply:** https://www.totaljobs.com/job/network-security-engineer/wwt-emea-uk-limited-job108256123

## About the Role

Essential:

 * Deep hands-on background with F5 TMOS, LTM, and DNS/GTM.
 * Track record upgrading iSeries, rSeries/F5OS, and VIPRION/vCMP in live environments.
 * At least one completed load balancer platform migration, start to finish.
 * Comfortable writing and troubleshooting iRules for traffic and app logic.
 * Working automation skills in Python, Ansible, or Terraform.
 * Solid grounding in TCP/IP, BGP, TLS/PKI, and DNS fundamentals.
 * A methodical approach to diagnosing issues across the network and app stack.

Desirable:

 * Familiarity with the legacy platform being replaced.
 * Experience running BIG-IP Virtual Edition on VMware.
 * F5 certifications (F5-CA, F5-CTS, F5-CSE) or equivalent know-how.
 * Background working in financial services or similarly regulated sectors.

## Description

* Move services onto new F5 pairs, rewriting iRules and traffic policies as needed.
 * Serve as the go-to F5 expert for design and architecture calls.
 * Roll out software upgrades across iSeries, rSeries, and VIPRION hardware.
 * Write runbooks covering backups, pre-checks, and rollback steps.
 * Stagger upgrades across HA pairs so services stay online throughout.
 * Manage cutover windows, including DNS/GTM changes, with tested fallback plans.
 * Dig into network, DNS, TLS, and application issues when changes go wrong.