Senior Network Engineer

Senior Network Engineer

Marks Sattin | Greater London, ENG, GB

Posted 11 days ago

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Description

A global, high-performance financial services organisation is seeking a Network Engineer to lead the design, deployment, and ongoing evolution of its worldwide network estate spanning data centres, trading environments, and enterprise locations.


This role will take end-to-end ownership of network project delivery, oversee third-party connectivity turn-ups, and act as the senior technical escalation point for complex incidents-while driving automation and AI-enabled operational improvements.


What you'll be doing



  • Design and implement data centre and enterprise network solutions (new builds, refreshes, migrations).

  • Deliver projects end-to-end: HLD/LLD documentation, build, testing, cutover, and operational handover.

  • Turn up and support third-party services, including CDN, extranet, and VPN connectivity.

  • Lead routing and switching design across Juniper, Arista, and Cisco platforms (BGP, OSPF, EIGRP, redistribution, filtering/policy).

  • Design, build and support EVPN/VXLAN fabrics using Arista EOS.

  • Act as senior escalation for major/complex incidents: triage, RCA, and permanent fixes.

  • Build and maintain automation/tooling using Python, Ansible, and Git to reduce manual effort.

  • Improve observability and operations using Grafana, Splunk, ServiceNow, and apply AI tools for proactive troubleshooting.

  • Maintain infrastructure hygiene: code upgrades, EOL replacements, audits, and standards adherence.

  • Mentor junior engineers and ensure strong documentation and cross-region handovers.


What we're looking for



  • CCNP Routing & Switching (or equivalent capability).

  • JNCIP-Junos (or equivalent capability).

  • Foundational wireless certification (required).

  • Degree in Computer Science/Engineering (or equivalent practical experience).

  • Strong routing/switching design background across Junos, Arista EOS, Cisco IOS (BGP/OSPF/EIGRP).

  • Hands-on EVPN/VXLAN design and implementation experience on Arista.

  • Working knowledge of Palo Alto firewalls and F5 load balancers.

  • Proven automation/scripting experience using Python and Ansible in production network environments.

  • Calm under pressure with a track record in incident leadership, RCA, and remediation.

  • Experience mentoring others and producing clear, high-quality technical documentation.


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