Principal Engineer - Voice & Network

Skillsets & experience required

Essential

• Proven experience in corporate network engineering within internal enterprise environments, with a track record of delivering across complex, multi-site global organisations.
• Deep expertise in enterprise SD-WAN technologies; ability to design, deploy, and optimise SD-WAN overlays.
• Extensive experience with enterprise switching, wireless access points, and security appliances, including centralised cloud-managed network platforms.
• Familiarity with cloud network security and secure web proxy solutions (SSE/SASE or equivalent), sufficient to troubleshoot connectivity issues and work effectively alongside an Information Security team.
• Solid experience with VPN technologies, including site-to-site and remote access solutions.
• Demonstrated experience with legacy and cloud voice systems (PBX/on-premise telephony), including SIP/ISDN circuits and troubleshooting issues with codexs.
• Experience in delivery of voice migration projects to cloud or UCaaS platforms.
• Comprehensive knowledge of networking fundamentals: TCP/IP, routing (BGP, OSPF), switching (VLANs, STP), DNS, DHCP/IPAM, and wireless protocols.
• Demonstrated experience mentoring and developing junior engineers, with the ability to act as an informal people lead — supporting career development conversations and driving team capability growth.
• Strong documentation skills — network diagrams, change records, and runbooks.
• Excellent problem-solving capability and composure under pressure.

Desirable

• Relevant industry certifications in enterprise networking, wireless, or security (vendor or vendor-neutral).
• Experience working in a global IT organisation with a distributed, multicultural team.
• Familiarity with cloud-based unified communications platforms and UCaaS migration experience.
• Exposure to network security frameworks and working alongside Information Security functions.
• ITILv4 Foundation or above.
• Hands-on experience with one or more cloud network security or SSE/SASE platforms.
• Prior experience in a formal or informal people-lead, team-lead, or deputy role; or demonstrated appetite to grow into formal line management responsibility.
• Experience designing or delivering structured technical training or upskilling programmes for non-specialist teams (e.g. service desk, helpdesk, or desktop support).