Trading Linux Systems Engineer - £150,000 Package

Job title: Trading Linux Systems Engineer Client: Trading Firm Salary: £150,000 Package Location: London Skills: Linux, Python, Low Latency, CI/CD, AWS A world-leading quant trading firm is hiring a Systems (Linux) Engineer to support, maintain and enhance the Linux infrastructure that its 24/7 trading operation runs on. This is deep infrastructure work at the sharp end — ultra-low-latency, high-frequency, real-time systems where performance is measured in microseconds and custom OS builds are the norm. You'll sit close to the action: keeping the Linux environment healthy day-to-day (emergency response, change execution, troubleshooting, performance tuning), while building the automation that provisions, configures and monitors thousands of Linux servers. You'll manage core services (DHCP, LDAP, DNS, NFS) across on-prem, hosted data centres and public cloud, and partner with the Cloud Architecture team to design and refine trading systems running in complex brownfield AWS environments purpose-built for low latency. What you'll be doing Day-to-day support of a critical Linux trading environment — emergency response, change execution, troubleshooting and resolving performance issuesDeveloping and refining tools to automate provisioning, configuration and monitoring at the scale of thousands of serversManaging core services (DHCP, LDAP, DNS, NFS) across on-prem, hosted DCs and public cloudWorking with Cloud Architecture to review existing and implement new designs for trading systems on AWSImproving the performance, resilience, availability and observability of existing cloud environmentsParticipating in a rotational on-call schedule (including early mornings and weekends) What you'll bring 5+ years administering an advanced Linux environment, with deep knowledge of Linux internalsStrong server-side networking (protocols, configuration)Proven automation/monitoring tool development; configuration management with AnsibleExpert Bash and good Python for scripting and automationSolid grasp of source control, CI/CD and automated deploymentStrong AWS expertise (EC2, ENA, VPC, ELB, Direct Connect, S3, EBS) in a low-latency performance-engineering context — including how Linux and kernel components are tuned for EC2 and the AWS networkA methodical problem-solver who communicates well and drives things to completionComfortable using AI in day-to-day work Nice to have Docker and/or KubernetesOpen-source or personal projectsAWS DevOps Engineer Professional or AWS Advanced Networking certifications