Senior Networking and Security Specialist

Project overview

Senior Networking and Security Specialist

Must be able to qualify for SC Cleared

Inside ir35

Remote working with some Data Centre visits as required

Key Responsibilities

• Senior Networking and Security Specialist

Responsibilities

Knowledge and Attributes:

Academic Qualification and Certifications:

Required experience:

Vendor Platforms:

• Lead the design and hands-on implementation of complex, multi-vendor network and security solutions across greenfield and brownfield environments.
• Produce High-Level Design (HLD) and Low-Level Design (LLD) documentation to a professional standard, suitable for internal review and client/stakeholder sign-off.
• Develop detailed implementation plans and change records, ensuring alignment with change management processes and minimal operational risk.
• Author comprehensive operational runbooks to support handover to operations and ongoing support teams.
• Perform design validation, proof-of-concept (PoC) testing, and pre/post-implementation verification.
• Configure, deploy, and optimise network and security infrastructure across a range of vendor platforms and technology domains.
• Diagnose and resolve complex, multi-layer network and security incidents, providing expert-level technical escalation support.
• Conduct technical assessments and capacity planning reviews, identifying risks and recommending improvements.
• Escalates unresolved problems and issues to the relevant third parties.
• Delegates lower complexity tasks to engineers and technicians.
• Assumes responsibility for the coordination of the activities of the engineers, in line with performance targets, leading by example and monitoring the quality of engineer's and technician's work when required.
• Act as the primary technical point of contact for stakeholders across projects, providing clear and timely communication on design decisions, project status, and risk.
• Acts as coach and mentor to more junior Implementation Engineers and Technicians.
• Present technical designs and implementation strategies to both technical and non-technical audiences, including senior leadership.
• Collaborate with project managers, solution architects, client network, security teams, and operations to ensure seamless delivery.
• Manage technical scope, expectations, and dependencies throughout the project lifecycle
• Assumes responsibility for the coordination of the activities of the Engineers, in line with performance targets.
• Engages vendors for priority escalations or bugs found during deployments.
• Perform any other related task as required.
• Proven track record delivering complex, multi-technology network and security designs in enterprise or service provider environments.
• Advanced understanding and appreciation of technical design and business principles.
• Advanced project fundamental and administration ability.
• Advanced project fundamentals which are demonstrated in the execution of installations and other assignments.
• Strong documentation skills with a portfolio of HLD, LLD, implementation plans, and runbooks
• Advanced customer engagement skills.
• Advanced relevant domain specialist knowledge.
• Excellent verbal communication skills.
• Client focused and displays a proactive approach to solving problems.
• Advanced ability to coach, mentor and provide guidance to team members.
• Ability to take ownership as technical lead during project lifecycle.
• Professional level certification in different Networking technologies such as Cisco, Juniper, Aruba, F5, CCIE, JNCIE, ACMP etc.
• Advanced work experience in technical implementation engineering, specific to Networking Routing & Switching.
• Enterprise and service provider routing protocols: BGP, OSPF, IS-IS, EIGRP
• Advanced switching: VLAN design, STP/RSTP/MSTP, VPC/LACP, QoS
• Overlay and underlay technologies: VXLAN, GRE, IPsec
• Advanced work experience in technical implementation engineering, specific to Cisco ACI (Application Centric Infrastructure).
• ACI fabric design, including spine-leaf architecture and multi-pod/multi-site
• Tenant, VRF, BD, EPG, and contract configuration
• Integration with external Layer 3 routing and Layer 4-7 service insertion
• ACI troubleshooting and operational management
• Advanced work experience in technical implementation engineering, specific to Networking Network Security.
• Next-Generation Firewall (NGFW) design and implementation
• Intrusion Detection and Prevention Systems (IDPS), Web Application Firewalls (WAF).
• Zero Trust Network Access (ZTNA), micro-segmentation, and network access control (NAC)
• VPN technologies: IPsec, SSL/TLS, SD-WAN security integration
• Security policy lifecycle management and compliance alignment
• Application delivery design and implementation: L4/L7 load balancing, SSL offloading, global server load balancing (GSLB)
• High availability architectures including active/passive and active/active clustering
• Advanced experience engaging with clients and conducting presentations.
• Advanced report writing experience.
• Advanced good project management experience.
• Advanced experience in diagnosis and troubleshooting.
• Must currently hold or be eligible to obtain UK Security Clearance (SC)
• Cisco
• IOS/IOS-XE/IOS-XR/NX-OS, ASA, Firepower, ISE, Catalyst Center (DNAC), ACI
• Juniper
• JunOS, SRX
• Fortinet
• FortiOS, FortiGate NGFW, FortiManager, FortiAnalyzer
• F5
• BIG-IP LTM/GTM/ASM/APM, iRules
• irewall platforms with Cisco ACI

Project details

• Start: 1/11/2026
• Duration: 12 months
• Location: England, UK, GB