Senior Networking & Security Specialist / Technical Lead
Location: Newbury - Hybrid, 1-2 days per week onsite
Contract: 6 months rolling
Security Clearance: Active or eligible for UK SC Clearance
Rate: £500-£600 per day, inside IR35
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.
Key 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/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
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 lifecycle management
- Compliance-aligned network security
Application Delivery
- 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, 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.
If you're an experienced Network & Security Specialist looking for your next contract opportunity in a technically challenging environment, we'd love to hear from you.
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Senior Networking & Security Specialist in Newbury employer: CBSbutler Ltd.
Join a leading public sector programme as a Data Engineer, where you'll contribute to transformative projects that enhance data capabilities and support digital innovation. Enjoy a flexible remote working environment with the opportunity for professional growth, collaboration within Agile teams, and the chance to make a significant impact on high-profile initiatives. With a commitment to engineering excellence and continuous improvement, this role offers a rewarding experience in a dynamic and supportive workplace.
