Technical Solution Architect - LAN, WAN, firewalls, F5, Zscaler ZPA/ZIA, BGP/OSPF

5 Month Contract
London (Remote, Hybrid)
£330-£400/day (Outside IR35)

Technical Solution Design Lead / Technical Authority experience needed for a 5 Month Contract mainly remote with 2 to 3 times a month in London travel when required (Hybrid). Start ASAP in January 2026.

Must have handson design / migration of at least two of the following at scale:

Check Point R8x firewalls, Cisco or Juniper LAN and WAN, F5 BIG-IP LTM/GTM/AFM,

Zscaler ZIA & ZPA, SD-WAN.
Working with a global IT Consultancy for a Telecoms end client on large-scale projects. Paying £(Apply online only)/day (Outside IR35).

Hybrid working - Contract mainly remote with 2 to 3 times a month in London London.

Key skills, experience + tasks will include:

• Network Security architecture or senior engineering across enterprise environments.
• Proven experience as a Technical Design Lead / Technical Authority
• Must have hands-on design / migration of at least two of the following at scale:

Check Point R8x firewalls, Cisco or Juniper LAN and WAN,

F5 BIG-IP LTM/GTM/AFM, Zscaler ZIA & ZPA, SD-WAN.

• Strong routing fundamentals (BGP, OSPF, route maps, redistribution).
• Ownership of end-to-end technical design decisions (not implementation-only roles)
• Demonstrable leadership in complex enterprise or carrier-scale environments
• Providing end-to-end technical design for complex network security architecture deployments and migrations.
• Documentation & tooling: Expertise with Visio or draw.io for architecture diagrams; PowerPoint for executive decks; Word/Confluence for LLDs. Familiarity with change tools (ServiceNow, Remedy) and SharePoint governance.
• Validating / integrating component designs for LAN, firewall, F5, WAN, VPN, ZPA/ZIA + security controls.
• Owning overall solution architecture, low-level designs (LLD), solution integrity from high-level architecture through to handover, acting as the single technical point of contact for external customers.
• Producing / maintaining architecture decks, LLDs, change packs (ER/CR forms), rollback procedures, and run books.
• Reviewing implementation artefacts (configs, Ansible/ Terraform scripts, F5 iRules) to ensure alignment to LLD.
• Qualifications: CCNP/CCIE Enterprise or Security, JNCIP/JNCIE, F5 CTS, Check Point CCSE, Zscaler ZCCA IA / ZCCA IAE, TOGAF, ITILv4.
• Providing 24/7 escalation cover to meet migration deadlines when rostered.