Senior Network​/Linux Infrastructure Engineer

Join a high-performing infrastructure engineering team responsible for designing, building and supporting the mission-critical platforms that power global electronic trading. This team operates at the heart of a highly regulated, performance-sensitive environment where reliability, security and low latency are fundamental.

This is a hands‑on engineering role combining deep Linux systems expertise with advanced networking knowledge. You'll work across physical data centres, low‑latency infrastructure and automation, collaborating with software engineers, platform teams and production support to continuously improve performance, resilience and operational excellence.

If you enjoy solving complex infrastructure problems, tuning Linux for maximum performance and building highly automated environments, this is an opportunity to work on some of the most technically demanding systems in the industry.

As a Senior Network & Linux Infrastructure Engineer, you'll be responsible for the design, deployment and operational support of large-scale on‑premises infrastructure supporting business‑critical trading applications.

You'll work across Linux, enterprise networking, automation and observability, ensuring infrastructure remains secure, resilient and optimised for high‑performance workloads.

This role combines project delivery with production engineering, giving you the opportunity to build new infrastructure while acting as an escalation point for complex technical issues.

This is not a traditional infrastructure support position. You'll be engineering the platforms that underpin some of the most demanding production environments, where performance, resilience and automation are critical. You'll work across Linux, networking and infrastructure engineering, helping shape the next generation of highly available, low‑latency platforms while solving complex technical challenges every day.

If you're passionate about Linux, networking and building resilient infrastructure at scale, this role offers an outstanding opportunity to work alongside highly experienced engineers using modern technologies in a fast‑paced engineering environment.

• Design, deploy and maintain enterprise Linux infrastructure supporting mission‑critical applications.
• Build and support high‑performance network environments across multiple data centres.
• Configure and maintain routing, switching and multicast networking infrastructure.
• Optimise Linux systems through kernel tuning, CPU affinity, memory optimisation and network stack configuration.
• Engineer resilient, highly available infrastructure with a focus on performance and reliability.
• Automate infrastructure provisioning, configuration management and operational workflows using scripting and Infrastructure as Code principles.
• Provide L3 production support for complex infrastructure issues and major incidents.
• Perform root cause analysis and implement permanent improvements to reduce operational risk.
• Execute infrastructure upgrades and change activities through controlled change management processes.
• Work closely with software engineering teams to optimise application performance on Linux platforms.
• Implement monitoring, alerting and observability across Linux, networking and infrastructure services.
• Ensure infrastructure complies with security standards, governance and operational best practice.
• Contribute to capacity planning, disaster recovery and infrastructure lifecycle management.
• Document infrastructure designs, operational procedures and technical standards.

What We’re Looking For

• 5+ years’ experience supporting enterprise Linux infrastructure.
• Strong Linux administration experience within production environments.
• Excellent understanding of Linux internals, kernel behaviour and operating system performance.
• Strong networking expertise across TCP/IP, routing and switching.
• Experience configuring and supporting enterprise network infrastructure.
• Hands‑on experience with Cisco and/or Arista networking technologies.
• Strong understanding of multicast networking including IGMP and PIM.
• Experience supporting physical data centre…