Network Security Engineer - F5​/DNS​/iRules

Role: F5 SME

IR35:
Inside - £550.00 - £575.00 per day

Duration: 12 months

World Wide Technology (WWT) is a global technology integrator and supply chain solutions provider. Through our culture of innovation, we inspire, build, and deliver business results, from idea to outcome.

World Wide Technology EMEA has an opportunity available for an F5 SME to support our client, a leading Global Financial Services provider with a security infrastructure uplift program.

The successful candidate will have deep knowledge in F5 internals, traffic management, iRule and DNS architecture.

• Design, implement, and maintain complex F5 BIG‑IP solutions across LTM and F5 DNS/GTM
• Develop and manage advanced iRules for traffic steering, security, and application logic
• Own and configure DNS and global traffic management, including Wide IPs, health monitors, and failover strategies
• Provide deep‑level troubleshooting across network, DNS, TLS, and application layers
• Act as an F5 subject matter expert for architecture decisions, incidents, and optimisation

• Strong hands‑on experience with F5 BIG‑IP (TMOS, LTM, DNS/GTM)
• Advanced iRules development and traffic management expertise
• Solid understanding of DNS infrastructure (authoritative vs recursive DNS, Anycast, TTLs, split DNS)
• Experience designing highly available, resilient application delivery architectures
• Ability to troubleshoot complex issues across TCP/IP, HTTP/S, TLS, and DNS
• Must be an EU Citizen. Some occasional travel may be required. Candidates will be required to go through background checks before commencing contract.

EQUAL OPPORTUNITIES

World Wide Technology is committed to equal opportunities and actively seeks applications from all sectors of the community irrespective of sex, race, colour, nationality, ethnic or national origin, disability, marital status, sexual orientation, having responsibility for dependents, age, religion/beliefs, or any other reason which cannot be shown to be justified.