Network and Voice Engineer

Reference: 57950

Location:

London, United Kingdom Industry: Financial Services Salary: 90,000 per annum

Role overview We are seeking a Network and Voice Engineer to design, support and enhance resilient enterprise networks and unified communications within a regulated financial services environment. You will ensure high availability, performance, security and service quality across LAN/WAN, data centre connectivity, cloud networking and voice platforms, working closely with infrastructure, security and service management teams.

Key responsibilities Design, implement and maintain routing and switching, including VLANs, STP, QoS, OSPF/BGP and high-availability patterns.

Support WAN and remote connectivity (MPLS/SD-WAN, VPN, IPSec/SSL), optimising performance and resilience.

Administer network security controls such as firewalls, NAC (e.g., 802.1X), segmentation and secure network access.

Engineer voice and unified communications solutions (SIP, VoIP, SBCs, call routing, dial plans, 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 (e.g., SNMP/Net Flow, Wireshark), producing clear documentation and runbooks.

Collaborate on DR/BCP testing, capacity planning, and platform lifecycle/patching aligned to risk and compliance requirements.

Contribute to automation and configuration management where appropriate (e.g., scripting, templates, infrastructure as code).Required skills and experience Strong hands-on experience supporting enterprise networks in a high-availability, low-latency environment.

Expertise with Cisco and/or Juniper routing and switching; solid understanding of TCP/IP, DNS, DHCP and network services.

Proven experience with voice technologies: SIP, RTP, codecs, QoS for voice, and enterprise telephony/UC platforms.

Experience with firewalls and network security principles; familiarity with IDS/IPS and secure access patterns.

Exposure to cloud networking (Azure/AWS), including VNET/VPC, routing, VPN/Express Route/Direct Connect concepts.

Strong troubleshooting capability and ability to communicate clearly with technical and non-technical stakeholders.

Experience working in regulated environments (e.g., financial services), with awareness of audit, change control and risk management.

Qualifications Relevant certifications such as CCNP (Enterprise/Collaboration) or JNCIP; equivalent experience considered.

ITIL knowledge or experience working within ITIL-aligned service management.