Network and Voice Engineer

Salary: £68,000 - 108,000 per year

Requirements:

• Strong hands-on experience supporting enterprise networks in a high-availability, low-latency environment.
• Expertise with Cisco and/or Juniper routing and switching, with a solid understanding of TCP/IP, DNS, DHCP and network services.
• Proven experience with voice technologies, including SIP, RTP, codecs, QoS for voice, and enterprise telephony/UC platforms.
• Experience with firewalls and network security principles, with familiarity in IDS/IPS and secure access patterns.
• Exposure to cloud networking in Azure and/or AWS, including VNET/VPC, routing, VPN, and ExpressRoute/Direct Connect concepts.
• Strong troubleshooting capability and the ability to communicate clearly with technical and non-technical stakeholders.
• Experience working in regulated environments, such as financial services, with awareness of audit, change control and risk management.
• Relevant certifications such as CCNP (Enterprise/Collaboration) or JNCIP, with equivalent experience considered.
• ITIL knowledge or experience working within ITIL-aligned service management.

Responsibilities:

• Design, implement and maintain routing and switching, including VLANs, STP, QoS, OSPF/BGP and high-availability patterns.
• Support WAN and remote connectivity, including MPLS/SD-WAN, VPN, IPSec/SSL, while optimising performance and resilience.
• Administer network security controls such as firewalls, NAC (for example 802.1X), segmentation and secure network access.
• Engineer voice and unified communications solutions, including SIP, VoIP, SBCs, call routing, dial plans and IVR, ensuring call quality and reliability.
• Manage incident, problem and change processes, including root cause analysis, post-incident reviews and preventative improvements.
• Monitor and troubleshoot using tooling such as SNMP/NetFlow and Wireshark, producing clear documentation and runbooks.
• Collaborate on DR/BCP testing, capacity planning, and platform lifecycle and patching aligned to risk and compliance requirements.
• Contribute to automation and configuration management where appropriate, including scripting, templates and infrastructure as code.

Technologies:

• AWS
• Azure
• Cloud
• Cisco
• Support
• ITIL
• LAN
• MPLS
• Network
• Security
• TCP/IP
• VPN
• ASP.NET
• C++

More:

We are a financial services organisation based in London, United Kingdom, offering a salary of 90,000 per annum. We are seeking a Network and Voice Engineer to help design, support and enhance resilient enterprise networks and unified communications within a regulated environment. In this role, we work closely across infrastructure, security and service management teams to ensure high availability, performance, security and service quality across LAN/WAN, data centre connectivity, cloud networking and voice platforms.

last updated 35 week of 2026