Principal Security & Systems Engineer – Quant Trading

Principal Security & Systems Engineer – Windows, Automation, Endpoint Security London – Hybrid Industry Leading Compensation Quant Capital is partnered with a leading trading firm looking to hire a Senior IT Security Engineer to strengthen its global security posture. This sits within a high-performing engineering group and suits someone who can take ownership, make clear technical decisions and build security controls that scale.

You will work across Windows engineering, endpoint security, automation, vulnerability management and platform hardening. The role mixes hands-on engineering with advisory responsibility and proactive threat mitigation. The environment is fast moving and technically demanding, and you will be the person wider IT teams rely on for clarity and sound judgement.

What you’ll be doing :

Designing and implementing security controls across Windows platforms

Driving vulnerability management initiatives and closing remediation at scale

Building automation around configuration, monitoring and incident response

Improving endpoint security across EDR, AV, patching and OS hardening

Working with core infrastructure including AD / Entra , PKI and networking

Monitoring emerging threats and advising on technical risk Supporting global IT teams in a large distributed environment

What you’ll need:

Strong Windows security engineering experience

Solid understanding of host-based controls: application control, firewalling, logging, encryption

Hands-on experience with EDR, endpoint protection, scanning and patching

Background in OS hardening, privileged access and security best practice

Knowledge of common attack techniques and the controls that mitigate them

Good grasp of Active Directory / Entra  PKIHigh-level Power Shell scripting skills

Clear communicator who can influence, collaborate and take ownership

This role suits someone who wants meaningful responsibility, enjoys working under pressure and can solve complex security problems across a global environment.

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