Senior Network Infrastructure Engineer

Roc Search; Greater London; On-site; GBP 70,000 - 110,000; Full time

Job summary

Roc Search Inc. is seeking a Senior Network Infrastructure Engineer for a prestigious financial services organisation on a six-month contract in the Greater London area.

The role focuses on hands-on design, implementation and optimization of complex enterprise and data-centre networks. You will own critical infrastructure, spanning Cisco Nexus data-centre switching, Spine-Leaf fabrics, VXLAN/EVPN, and security architectures, collaborating with security and engineering teams to deliver robust,

Qualifications

• Extensive hands-on Cisco enterprise and data-centre networking, especially Nexus.
• Strong Spine-Leaf architectures, fabrics and high-availability design.
• Experience with VXLAN/EVPN in data-centre networks.
• Deep knowledge of BGP, OSPF, VLANs and routing protocols.
• Firewall experience with Check Point is advantageous.

Responsibilities

• Design, configure and troubleshoot enterprise and data-centre networks.
• Support and maintain Cisco Nexus switching and data-centre platforms.
• Work with Spine-Leaf, VXLAN and EVPN architectures.
• Configure routing protocols (BGP, OSPF) and VLANs; troubleshoot issues.
• Support network security infrastructure and firewall policies.

Skills

Cisco Networking

Data-Centre Networking

Routing & Switching

Network Security

Troubleshooting

Education

CCNP or CCIE certifications

Tools

Cisco Nexus

VXLAN/EVPN

Check Point

Aruba data-centre fabric

F5 BIG-IP

Palo Alto

Job description

Overview

We are seeking an experienced Senior Network Infrastructure Engineer to join an established financial services organisation on an initial six-month contract.

This is a highly technical, hands-on position requiring extensive experience across enterprise networking, data-centre infrastructure, network security and complex routing and switching environments.

The successful candidate will take ownership of critical network infrastructure, supporting the design, implementation, optimisation and troubleshooting of complex networking solutions.

We are particularly interested in engineers who have worked in demanding, highly available environments such as financial services, banking or other enterprise organisations.

Key Responsibilities

• Design, configure, implement and troubleshoot complex enterprise and data-centre networking environments.
• Support and maintain Cisco networking infrastructure, particularly Cisco Nexus switches and data-centre switching platforms.
• Work with modern data-centre network architectures, including Spine-Leaf topology, VXLAN and EVPN.
• Configure and troubleshoot routing and switching protocols, including BGP, OSPF, VLANs and associated technologies.
• Support network security infrastructure, including Check Point firewalls, firewall policies and network segmentation.
• Work with Aruba networking technologies, particularly within data-centre environments.
• Deliver network migrations, upgrades, infrastructure improvements and technical remediation.
• Troubleshoot complex network connectivity, routing, switching and performance issues.
• Maintain resilient, secure and highly available infrastructure.
• Collaborate with infrastructure, security and engineering teams to deliver technical improvements.

Essential Technical Experience

• Cisco Networking: Extensive hands-on experience with Cisco enterprise and data-centre networking, particularly Cisco Nexus switching.
• Data-Centre Networking: Strong understanding and practical experience with Spine-Leaf architectures, network fabrics and high-availability design.
• VXLAN / EVPN: Experience configuring, implementing or troubleshooting modern data-centre networking technologies.
• Routing & Switching: Excellent knowledge of BGP, OSPF, Layer 2/3 switching, VLANs, routing protocols and network troubleshooting.
• Network Security: Strong hands-on firewall experience, ideally Check Point.
• Infrastructure Delivery: Proven experience implementing network changes, migrations, upgrades and improvements in production environments.
• Troubleshooting: Ability to independently diagnose and resolve complex infrastructure and network issues.

Highly Desirable Experience

• Aruba networking, particularly Aruba data-centre switching and fabric technologies.
• Cisco Nexus 7000/9000 series migrations and implementations.
• Check Point firewall configuration and administration.
• F5 BIG-IP load balancing, including LTM/GTM.
• Palo Alto firewall experience.
• EVPN/VXLAN fabric implementation and troubleshooting.
• Experience within banking, investment management, financial trading or other highly regulated environments.
• CCNP or CCIE certifications.

Ideal Candidate Profile

We are looking for a senior-level engineer who combines deep technical knowledge with practical, hands-on infrastructure delivery.

The ideal candidate will have substantial experience working with Cisco-based enterprise and data-centre environments, be comfortable configuring and troubleshooting complex network technologies, and have a strong understanding of network security.

This position will suit someone who has previously worked as a Senior Network Engineer, Senior Network Infrastructure Engineer, Data Centre Network Engineer or Network Consultant.

Candidates should be confident operating independently, investigating complex technical issues and implementing solutions directly rather than working solely in an architectural or advisory capacity.