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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Networking & Security Specialist - **Company:** CBS Butler Limited - **Location:** Newbury, UK - **Experience:** Expert - **Salary:** £130,000.0 - £156,000.0 - **Contract:** Temporary contract - **Skills:** Link Aggregation (Ethernet), Application Programming Interfaces (APIs), Border Gateway Protocol, Catalyst (Software), Cisco IOS, Complex Networks, Enhanced Interior Gateway Routing Protocol, Internet Protocol Security (IP SEC), Junos, Python (Programming Language), Network Security, Netconf, Cisco Nexus Switches, Open Shortest Path First (OSPF), Ansible, Virtual Local Area Networks, Wide Area Networks, Transport Layer Security, Identity Services Engine, Load Balancing, Nx-os, Firewalls (Computer Science), Amazon Virtual Private Cloud (VPC), Juniper, Fortinet, Routing & Switching, Firepower, Open Network Automation Platform, Big Ip, Cisco - **Published:** August 24, 2026 - **Apply:** https://www.careerboard.com/pt/en/find-jobs-in-United-Kingdom/-F2973D4262386B4C43/ ## About the Role * L4/L7 load balancing * SSL offloading * Global Server Load Balancing (GSLB) * High-availability architectures Vendor Technologies * Cisco IOS/IOS-XE/IOS-XR/NX-OS, ASA, Firepower, ISE, Catalyst Center and ACI * Juniper JunOS and SRX * Fortinet FortiOS, FortiGate, FortiManager and FortiAnalyzer * F5 BIG-IP LTM/GTM/ASM/APM and iRules ? Desirable * Network automation experience using Python and/or Ansible * Experience integrating network platforms via REST/NETCONF/RESTCONF/gRPC APIs * Professional-level networking certifications such as CCIE, JNCIE or equivalent * Cisco DevNet certification What We're Looking For You'll need to be a confident technical lead who can take ownership of complex deliverables, communicate technical concepts clearly, solve problems under pressure and work effectively with both technical and business stakeholders. ## Description We are looking for an experienced Senior Networking & Security Specialist/Technical Lead to join a high-level technical delivery team, leading the design and hands-on implementation of complex, multi-vendor network and security solutions across enterprise environments. This is a hands-on role combining technical leadership, solution design, implementation and stakeholder engagement., * Lead the design and implementation of complex network and security solutions across greenfield and brownfield environments * Produce high-quality HLDs, LLDs, implementation plans and operational runbooks * Perform design validation, PoC testing and pre/post-implementation verification * Configure, deploy and optimise network and security infrastructure * Diagnose and resolve complex network and security incidents * Conduct technical assessments and capacity planning * Act as the primary technical point of contact for project stakeholders * Present technical designs and implementation strategies to technical and non-technical audiences * Coordinate engineers and technicians, providing technical leadership and mentoring * Work closely with project managers, solution architects, client teams and operations throughout the project life cycle Technical Experience Required We're particularly interested in candidates with strong experience across: Networking * Advanced routing & switching * BGP, OSPF, IS-IS and EIGRP * VLAN, STP/RSTP/MSTP, vPC/LACP and QoS * VXLAN, GRE and IPsec * Enterprise and service-provider environments * Cisco ACI, including spine-leaf architecture and multi-pod/multi-site Network Security * Next-Generation Firewall design and implementation * IPsec, SSL/TLS and SD-WAN security * Security policy and life cycle management * Compliance-aligned network security ## Related Videos - [How Cisco embraced a DevOps culture within its network engineering team](https://www.wearedevelopers.com/videos/99-how-cisco-embraced-a-devops-culture-within-its-network-engineering-team) - [Your Infrastructure Is Not a Playground: AI Agents for Infra Done Right](https://www.wearedevelopers.com/videos/2084-your-infrastructure-is-not-a-playground-ai-agents-for-infra-done-right) - [Computer Vision from the Edge to the Cloud done easy](https://www.wearedevelopers.com/videos/263-computer-vision-from-the-edge-to-the-cloud-done-easy) - [Demystifying application networking in the cloud](https://www.wearedevelopers.com/videos/675-demystifying-application-networking-in-the-cloud) - [Small, Secure, Interconnected: The next Internet Protocol](https://www.wearedevelopers.com/videos/100062-small-secure-interconnected-the-next-internet-protocol) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [Best Companies to work for in London: Top 25 Companies in 2023](https://www.wearedevelopers.com/magazine/187-best-companies-to-work-for-in-london-top-25-companies-in-2023) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers) - [Basic And Advanced Networking in Dart and Flutter](https://www.wearedevelopers.com/magazine/112-basic-and-advanced-networking-in-dart-and-flutter) - [The Best Job Search Websites of 2025](https://www.wearedevelopers.com/magazine/368-the-best-job-search-websites-of-2025)