Senior Network Engineer (Inside IR35, Cisco, Arista, Palo Alto)

A global financial markets firm needs a Senior Network Engineer to support latency-sensitive trading infrastructure across on-prem and cloud environments. The role covers customer connectivity, complex troubleshooting, and building the automation and observability tooling that keeps critical systems running. You'll work across on-prem and cloud, with real ownership over production network infrastructure.
Responsibilities:

• Engineer and support customer connectivity across on-prem and cloud, including circuit provisioning, AWS networking, and VPN
• Configure and deploy production changes across routing, firewall, and cloud network infrastructure
• Troubleshoot complex environments (BGP, OSPF, MPLS, multicast, HSRP)
• Provide real-time monitoring and incident response for global network infrastructure
• Lead escalations and advanced troubleshooting across network, cloud, and infrastructure domains
• Build automation, monitoring, and observability tooling via scripting and API integrations (Python)
• Perform deep packet analysis and contribute to root cause investigations

What you'll bring:

• 5+ years' network engineering experience across Cisco, Arista, and Palo Alto
• Strong fundamentals in routing, switching, and firewall technologies (BGP, OSPF, Multicast)
• Packet analysis experience (tcpdump, Wireshark, tshark)
• Scripting or API-driven automation experience (Python)

Initial 6-month contract, with a significant pipeline of work in 2027.