Infrastructure System Engineer

Job Title: Infrastructure Engineer (Linux & Windows)

Location: Central London

Client Type: Market-Maker

Employment Type: Full-Time, on-site Hybrid

Compensation: Base + Competitive Bonus

*Must Have - Investment Management/Financial Markets Experience (Hedge Funds, Asset Management, Sell-Side, Brokerage Houses, Financial Exchanges)

We are working exclusively with a market-maker to identify a dual-stack Infrastructure Engineer to join their global infrastructure function. This is a deeply technical, hands-on role for an engineer with equal command of both Linux and Windows production environments, operating within a high-performance electronic trading infrastructure where uptime, latency, and precision are non-negotiable.

The Role

You will own the engineering, automation, and operational stability of the firm's hybrid infrastructure spanning both Linux and Windows environments. This is an engineering-first role — the firm needs someone who architects, automates, and optimises at a systems level, not someone who reacts to tickets.

What You'll Be Doing

• Engineering and maintaining production Linux (RHEL/CentOS/Ubuntu) and Windows Server environments across trading and corporate infrastructure
• Managing and optimising VMware vSphere/ESXi virtualisation platforms at an infrastructure level
• Owning Active Directory architecture, Group Policy, DNS, DHCP, and PKI alongside Linux identity integration (LDAP, Kerberos, SSSD)
• Developing automation frameworks using PowerShell, Python, Bash, and infrastructure-as-code tooling (Ansible, Terraform)
• Supporting and optimising low-latency trading infrastructure — kernel tuning, CPU pinning, NUMA optimisation, and network stack configuration on Linux
• Owning patching strategy, vulnerability remediation, and lifecycle management across both estates
• Hardening environments against CIS benchmarks and internal security standards across both platforms
• Investigating and resolving complex, high-priority incidents in a time-critical production trading environment
• Contributing to infrastructure architecture decisions alongside network, security, and platform engineering teams

What We're Looking For

• 5–10 years hands-on infrastructure engineering experience across both Linux and Windows in a production environment
• Deep Linux systems expertise — RHEL/CentOS/Ubuntu, kernel-level tuning, performance optimisation
• Strong Windows Server engineering — Active Directory architecture, GPO design, PKI, and security hardening
• Advanced scripting and automation capability across PowerShell, Python, and Bash
• VMware vSphere/ESXi administration and optimisation at an infrastructure level
• Experience in electronic trading, low-latency, or financial services production environments essential
• Strong incident diagnosis, root cause analysis, and post-mortem capability
• Infrastructure-as-code experience — Ansible, Terraform, or equivalent