Senior Networking & Security Specialist

Salary: £? - ? per year

Requirements:

• Strong experience across advanced routing and switching
• Experience with BGP, OSPF, IS-IS and EIGRP
• Experience with VLAN, STP/RSTP/MSTP, vPC/LACP and QoS
• Experience with VXLAN, GRE and IPsec
• Experience in enterprise and service-provider environments
• Experience with Cisco ACI, including spine-leaf architecture and multi-pod/multi-site
• Experience in next-generation firewall design and implementation
• Experience with IPsec, SSL/TLS and SD-WAN security
• Experience with security policy and lifecycle management
• Experience with compliance-aligned network security
• Experience with L4/L7 load balancing, SSL offloading, GSLB and high-availability architectures
• Experience with Cisco IOS/IOS-XE/IOS-XR/NX-OS, ASA, Firepower, ISE, Catalyst Centre and ACI
• Experience with Juniper JunOS and SRX
• Experience with Fortinet FortiOS, FortiGate, FortiManager and FortiAnalyzer
• Experience with F5 BIG-IP LTM/GTM/ASM/APM and iRules
• Experience with network automation using Python and/or Ansible is desirable
• Experience integrating network platforms via REST/NETCONF/RESTCONF/gRPC APIs is desirable
• Professional-level networking certifications such as CCIE, JNCIE or equivalent are desirable
• Cisco DevNet certification is desirable
• Active or eligible for UK SC Clearance

Responsibilities:

• 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- and 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 lifecycle

Technologies:

• Ansible
• Cisco
• Firewall
• FortiGate
• Load Balancing
• Network
• Nx
• Python
• REST
• Security
• XR
• gRPC
• iOS

More:

We are a high-level technical delivery team based in Newbury, working on a hybrid basis with 1-2 days per week onsite. This is a 6-month rolling contract at a rate of £500-£600 per day inside IR35. We are seeking an experienced Senior Networking and Security Specialist / Technical Lead to take a hands-on role combining technical leadership, solution design, implementation and stakeholder engagement across complex enterprise network and security environments.

last updated 34 week of 2026