Senior Network Security Engineer – Cisco & High Availability (London)

Project Freelance; Greater London; Hybrid; GBP 60,000 - 70,000; Full time

Job summary

Onyx-Conseil is seeking a Senior Network Engineer in London to support BAU operations and deliver secure networking solutions. You will design and implement firewall policies, manage IPS deployments, and uphold global standards across data-centre and branch networks.

The role requires strong Cisco expertise, experience with DMZ, VLANs and high availability, and certification in Cisco technologies. Banking sector exposure is a plus; hybrid/onsite options may apply.

Qualifications

• Experience in mission-critical environments and operational deployments.
• Knowledge of data-centre and branch inter-connectivity is essential.
• Experience with Cisco multi-layer switches and 6500 routers.

Responsibilities

• Support BAU and delivery of allBAU and support services.
• Design, build and implement firewall solutions from perimeter to DMZ.
• Support IPS deployment for European branches.
• Develop, maintain and deliver global networking standards.

Skills

Cisco networking

Firewall security

Routing protocols

VLAN segregation

DMZ design

High availability

Penetration testing

AAA authentication

RADIUS RSA

Education

CCNP certification

Networking certs

Tools

McAfee HIPS

Trend Micro

SafeNet

Palo Alto

Juniper

Tripwire

Job description

Onyx-Conseil is seeking a Senior Network Engineer in London to support BAU operations and deliver secure networking solutions. You will design and implement firewall policies, manage IPS deployments, and uphold global standards across data-centre and branch networks.

The role requires strong Cisco expertise, experience with DMZ, VLANs and high availability, and certification in Cisco technologies. Banking sector exposure is a plus; hybrid/onsite options may apply.