Referment is working with a global investment manager to hire a Networking and Security Engineer into its Technology Infrastructure function. The firm runs a multi-site network estate in a regulated, fast-moving financial environment, and treats networking and security as two halves of one discipline rather than separate teams. You'll join a small infrastructure group that owns connectivity, availability and defensive strength together, and carries genuine responsibility for both.

The Role

Design, build and maintain network infrastructure across Cisco routers, switches, firewalls, VPNs and wireless, keeping availability, performance and security tight at every layer.
Own the SD-WAN architecture end to end: deployment, configuration, optimisation and ongoing management of the fabric across sites.
Manage firewall infrastructure, including rule-base and policy design, segmentation and regular audits to keep a tightly controlled perimeter.
Lead security operations across threat detection, incident response and vulnerability management, with network traffic analysis as a core input.
Monitor, triage and respond to events across the network and wider estate, covering log analysis, anomaly detection and threat hunting, with awareness of modern automation- and AI-driven attack vectors.
Drive hardening across network devices, servers, endpoints and cloud-adjacent systems, and design segmentation and access control into architecture from the outset rather than retrofitting it.
Run network and vulnerability assessments and penetration-testing exercises, then prioritise and remediate the findings.
Improve security tooling such as SIEM, EDR, IDS/IPS and endpoint protection, with particular focus on integration with the network.
Act as the escalation point for network and security incidents across 2nd and 3rd line, and work across Windows Server and Linux (Red Hat/CentOS) estates to a consistent security baseline.

What We're Looking For

At least 7 years across infrastructure, networking and security roles.
Hands-on Windows Server and Linux (Red Hat/CentOS) experience.
Solid networking foundations — TCP/IP, VLANs, VPNs, DNS and DHCP — with practical Cisco experience.
Demonstrated implementation of security controls: patch management and system hardening, endpoint protection and monitoring, and identity and access management.
A good grasp of cyber security principles and modern threat landscapes, including automation and AI-driven attack vectors.
Experience with virtualisation (VMware) and enterprise storage (SAN/NAS).
Structured, analytical troubleshooting, and the ability to balance BAU work with project delivery.

Desirable

Scripting or automation experience, for example PowerShell or Bash.
Prior experience in financial services or another regulated environment.

The role is office-based in Hong Kong, five days per week on-site, and includes participation in an on-call rotation supporting critical network and security systems outside business hours.

This could suit a network engineer who has moved toward security ownership, or a security engineer with strong hands-on Cisco and firewall depth, particularly from regulated or financial environments. If you like holding both the architecture and the operational detail, this role gives you that scope.

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Networking and Security Engineer (6CD7793)

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