Systems: Senior Linux Infrastructure Engineer

Selby Jennings; Greater London; On-site; GBP 120,000 - 190,000; Full time

Job summary

Selby Jennings is seeking a Senior Linux Infrastructure Engineer for our London client, a prestigious hedge fund that designs and operates a world-class platform across global data centres, cloud environments and offices. You will design, build, and support critical Linux-based infrastructure to underpin a high‑impact trading business.

The role requires 10+ years in large-scale Linux environments, strong Python automation, and deep knowledge of CI/CD, security, and networking.

Qualifications

• 10+ years of experience engineering large-scale Linux infrastructure.
• Strong Python development and automation expertise.
• Deep understanding of Linux operating systems, system internals, and configuration management tools.
• Exceptional troubleshooting across host and network layers.
• Experience with automated build systems, software deployment frameworks, and CI/CD pipelines.
• Strong knowledge of infrastructure security principles and operational best practices.
• Exposure to cloud platforms, storage environments, databases, and Windows/Linux integration.

Responsibilities

• Design, build, and maintain Linux-based infrastructure across global datacentres, cloud environments, and offices.
• Drive improvements in platform reliability, scalability, security, and operational efficiency.
• Contribute to architecture, implementation, and integration of core infrastructure systems.
• Troubleshoot complex infrastructure, OS, and network issues, identifying root causes and solutions.
• Enhance infrastructure automation and reduce operational overhead through engineering-led improvements.
• Partner with security, infrastructure, and development teams on strategic technology initiatives.
• Support and evolve key platform services underpinning business-critical operations.
• Strengthen infrastructure security framework through best-practice design and implementation.
• Contribute to deployment automation, build systems, and CI/CD capabilities.

Skills

Python

Linux infrastructure

CI/CD

Automation

Security principles

Networking

DNS

DHCP

Kerberos

Rust

Go

Java

C

C#

Education

Bachelor's degree in Computer Science or equivalent

Tools

CI/CD pipelines

Job description

Our client is a prestigious hedge fund seeking a Senior Linux Infrastructure Engineer to join their world‑class platform engineering function. This Senior Linux Infrastructure Engineer will play a key role in designing, building, and supporting the critical technology infrastructure that underpins a highly successful investment business operating across global offices, datacentres, and cloud environments.

They are looking for a Linux Infrastructure Engineer who combines deep technical expertise with a proactive, solutions‑focused mindset. The ideal Linux Infrastructure Engineer will thrive in complex, large‑scale environments, enjoy solving challenging infrastructure problems, and take ownership of improving reliability, security, and automation. This opportunity is well suited to a collaborative Linux Infrastructure Engineer who wants to work alongside some of the strongest engineering talent in the industry while having a meaningful impact on a mission‑critical platform.

London

Key Responsibilities

• Design, build, and maintain critical Linux‑based infrastructure across global datacentres, cloud environments, and office locations.
• Drive improvements in platform reliability, scalability, security, and operational efficiency.
• Contribute to the architecture, implementation, and integration of core infrastructure systems.
• Troubleshoot complex infrastructure, operating system, and network‑related issues, identifying root causes and implementing lasting solutions.
• Enhance infrastructure automation and reduce operational overhead through engineering‑led improvements.
• Partner with security, infrastructure, and development teams on strategic technology initiatives.
• Support and evolve key platform services that underpin business‑critical operations.
• Strengthen the firm’s infrastructure security framework through best‑practice design and implementation.
• Contribute to deployment automation, build systems, and CI/CD capabilities across the technology estate.

Key Skills & Experience

• 10+ years' experience supporting and engineering large‑scale Linux infrastructure environments.
• Strong Python development and automation expertise.
• Deep understanding of Linux operating systems, system internals, and configuration management tools.
• Exceptional troubleshooting and diagnostic capabilities across both host and network layers.
• Experience with automated build systems, software deployment frameworks, and CI/CD pipelines.
• Strong knowledge of infrastructure security principles and operational best practices.
• Solid understanding of network protocols and enterprise infrastructure services.
• Experience supporting DNS, DHCP, Kerberos, or similar core infrastructure technologies.
• Exposure to cloud platforms, large‑scale storage environments, databases, and Windows/Linux integration.
• Knowledge of Rust, Go, Java, C, or C# would be advantageous.
• Excellent communication and stakeholder management skills within globally distributed teams.
• Degree in Computer Science or another technical discipline preferred.