senior network and security engineer.

Senior Network / Security Engineer is currently required for a permanent role to join a dynamic IT team in the government sector. In this pivotal role, you will support, maintain, enhance, and implement Network, Voice, and Security environments, ensuring the highest levels of availability, performance, and security.

You will act as a Subject Matter Expert (SME) in network, voice, and security technologies—taking the lead on complex escalations, delivering project-based enhancements, and driving industry-best practices across the infrastructure.

Key Responsibilities:

• Support, maintain, and enhance Network, Voice, and Security environments.

• Lead resolution of complex and escalated support issues within the Network Engineering team.

• Architect, design, and implement highly available network and voice systems, ensuring reliability and scalability.

• Design and maintain configuration management and automation solutions for network infrastructure.

• Maintain accurate technical and user documentation, including as-built and support guides.

• Operational management of the network and security infrastructure, ensuring uptime, performance, and compliance.

• Proactively identify and address vulnerabilities, and support remediation activities.

• Perform network capacity planning, optimisation, and security hardening.

• Monitor and manage network and security environments using advanced toolsets (e.g., SolarWinds, Stealthwatch, LogRhythm).

• Support and maintain enterprise video conferencing and collaboration solutions.

Technical Requirements & Experience:

Networking:

• Expert understanding of:

  • WAN: MPLS, DMVPN, IPSec, SSLVPN, Ethernet, Cellular

  • LAN: VLANs, VTP, Spanning Tree

  • IP Routing: BGP, OSPF, EIGRP

  • High Availability from Edge to Core

• Advanced knowledge of Cisco technologies: routers, switches, VoIP, and video infrastructure (CUCM, CUC, CUAC, Webex Control Hub)

Security:

• Hands-on experience with:

  • Cisco Firewalls (FTD, ASA, FMC), Cisco ISE, Cisco Umbrella

  • Forescout, Stealthwatch, LogRhythm SIEM, Firemon, Nessus, Tenable

• Experience implementing government-aligned network security standards

Voice & Video:

• Implementation and support of Cisco VoIP and video conferencing devices

• Experience with CUCM, Jabber Clients, Cisco Video Endpoints (RoomOS, MTR)

Cloud & Automation:

• Azure networking implementation and design

• Scripting/automation for configuration management and repeatable tasks

Monitoring & Documentation:

• Proactive monitoring and analysis of network and security health

• Proficiency with SolarWinds and other enterprise monitoring tools

• Creation and maintenance of detailed network diagrams and documentation

Desirable Additional Skills:

• Experience with VMware and Cisco UCS server environments

• Carrier connectivity management and support

• Multi-site hardware and systems software administration

Qualifications & Certifications:

• Cisco Certified Network Professional (CCNP) or equivalent – Required

• ITIL v3 Foundation Certification – Required

• Certified Information Systems Security Professional (CISSP) – Highly Desirable

Ready to Apply?

If you are a proactive, experienced Network & Security professional looking to take the next step in your career, we want to hear from you!

At Randstad Digital, we are passionate about providing equal employment opportunities and embracing diversity to the benefit of all. We actively encourage applications from any background.