Senior Infrastructure Engineer: Low-Latency Networking

Dex; Greater London; On-site; GBP 120,000 - 180,000; Full time

Job summary

Dex partners with a premier algorithmic market maker to hire a senior Linux and network engineer. You will own the physical and virtual compute and networking estate powering live trading and settlement systems, configuring bare-metal Linux servers and co-located data centres.

You will write Python automation for provisioning, monitor with Prometheus and Grafana, and act as the escalation point for latency, packet loss, and hardware faults across global estates.

Qualifications

• 5+ years managing production Linux environments and enterprise networks.
• Strong TCP/IP, routing, latency, loss, jitter troubleshooting.
• Hands-on with Cisco Nexus/Catalyst switches and data center hardware.
• Python for automation with Git workflows.
• Willingness to participate in out-of-hours/on-call rotations.

Responsibilities

• Own and scale the physical and virtual network foundation across global data centres, balancing throughput and ultra-low latency.
• Serve as the senior escalation point for production network anomalies, OS bottlenecks, and hardware faults across live trading estates.
• Write Python automation to provision, configure, and audit switches, routing policies, and server fleets with minimal manual work.
• Instrument hosts, links, and switches with Prometheus, Grafana, and SNMP to detect microbursts and degradation.
• Plan and execute zero-downtime maintenance windows, hardware upgrades, and cabling overhauls across distributed co-location sites.

Skills

Linux administration

Network engineering

Python scripting

Latency troubleshooting

On-call rotation

Tools

Cisco Nexus

Catalyst switches

Prometheus

Grafana

SNMP

tcpdump

Wireshark

Job description

Dex partners with a premier algorithmic market maker to hire a senior Linux and network engineer. You will own the physical and virtual compute and networking estate powering live trading and settlement systems, configuring bare-metal Linux servers and co-located data centres.

You will write Python automation for provisioning, monitor with Prometheus and Grafana, and act as the escalation point for latency, packet loss, and hardware faults across global estates.