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Appvia

Senior Network Engineer – Active UK Government Security Clearance Required

Appvia

. Lead Cisco SD-WAN migration and transition workstreams .

Posted 11/12/2026full-timeLondon • United KingdomSenior💰 £75,000 - £85,000 per yearWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates expertise in leading Cisco SD-WAN migrations, designing and supporting enterprise network environments, and troubleshooting complex networking issues. Possesses strong stakeholder communication skills and the ability to mentor junior engineers while ensuring network performance and security.

Highest-signal resume keywords
Cisco SD-WAN ExperienceCCNA CertificationNetwork Migration Project LeadershipIPv4/IPv6 MigrationStrong Stakeholder Communication

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Network DesignRoutingSwitchingFirewallingLoad BalancingTroubleshootingRoot-Cause AnalysisNetwork TestingIncident ManagementSystems Installation
Soft Skills
CoachingMentoringStakeholder CommunicationConsulting
Tools & Technologies
Cisco ACI/NexusBGPOSPFMPLSVLANsVRFsPalo AltoCheck PointVPN/IPSecNetscaler/F5/VMware NSX
Certifications & Qualifications
CCNACCNPCCIEActive UK Security Clearance (SC)
Industry Keywords
Cloud NetworkingInfrastructure-as-CodeLive ServiceOperational EnvironmentsManaged-Service Environments

Tech Stack

Tools & technologies
CloudSwitchingVMware

About the role

Key responsibilities & impact
  • Lead Cisco SD-WAN migration and transition workstreams
  • Review and peer-review network designs produced by other engineers
  • Own migration and transition activities from planning through delivery
  • Support senior architects with materials for formal design and security governance boards
  • Gather and analyse bandwidth, latency, fault tolerance, and access-control requirements
  • Own complex network incidents, troubleshooting, and root-cause analysis
  • Lead network changes, upgrades, migrations, and optimisation, including IPv4/IPv6 migration
  • Design and support routing, switching, firewalling, VPN, and load-balancing solutions
  • Carry out systems installation and removal
  • Plan and support network testing
  • Evaluate project outcomes and capture best practices and lessons learned
  • Produce and review high-level and low-level network designs and technical documentation
  • Improve network availability, performance, resilience, and security
  • Coach and mentor junior network engineers and support their development and appraisal
  • Collaborate with engineering, service management, architecture, and customer teams

Requirements

What you’ll need
  • Active UK Security Clearance (SC) required
  • CCNA certification, or demonstrable equivalent knowledge of networking concepts, switching, routing, firewalling, and load balancing
  • Cisco SD-WAN experience, including BGP
  • Strong experience designing, implementing, and supporting enterprise network environments
  • Experience with IPv4/IPv6 migration
  • Experience owning and leading network migration projects
  • Experience troubleshooting complex production networking issues and leading root-cause analysis
  • Experience in live service, operational, or managed-service environments, including incident management
  • Experience with network testing and test planning
  • Experience with systems installation and removal
  • Confidence producing, reviewing, and peer-reviewing network designs and technical documentation
  • Experience supporting formal design or security governance boards
  • Experience coaching and mentoring junior network engineers
  • Strong stakeholder communication and consulting skills
  • Formal training in computer science to degree level, or equivalent industry experience
  • NPPV3 clearance highly desirable
  • Cloud networking, infrastructure-as-code, Cisco ACI/Nexus, OSPF/MPLS/VLANs/VRFs, Palo Alto or Check Point, VPN/IPSec, Netscaler/F5/VMware NSX, and CCNP/CCIE are nice to have

Benefits

Comp & perks
  • 10% Bonus
  • 10% Shares
  • Flexible working with core hours of 10-4pm
  • Hybrid working with only one compulsory office day per month
  • 25 days’ holiday a year, plus bank holidays
  • Additional day off for your birthday
  • Enhanced maternity and paternity to full pay
  • Workplace Nursery Benefit
  • Full Private Healthcare cover for you with partners and children covered 50%
  • Death in Service
  • Cycle to Work scheme
  • Electric Car Scheme
  • Pension plus a salary sacrifice option
  • Employee Assistance Programme
  • Free hygiene products available in the London office
  • Free therapy through AXA
  • Access to the Headspace App
  • Trained Mental Health First Aiders
  • Learning budget of £1,000 a year
  • Your own MacBook Pro while you work at Appvia
  • Dog friendly office
  • Free snacks in the office
  • Regular team socials, board game nights, industry meetups and more
  • Pool table and ping pong table