Infrastructure Security Engineer

Information Security Engineer (Infrastructure → Security)

London | Hybrid | 3 days

A leading technology-driven trading firm is looking for an InfoSec Practitioner to join a small, highly technical security team in London.

This is not a traditional SOC role and not a pure security engineering position either. The team is looking for someone who enjoys being hands-on operationally, but who also wants to improve systems, tooling, detections and infrastructure over time.

The environment is heavily infrastructure-focused, so strong networking and systems understanding is a major plus.

The role will involve:

• Investigating alerts and security events

• Reviewing logs and handling operational security issues

• Improving detections and reducing false positives

• Working closely with infrastructure and platform teams

• Reviewing security configurations and automation opportunities

• Contributing to network security and monitoring initiatives

• Using scripting/automation to improve operational workflows

The ideal profile:

• 3–7 years experience within Security Operations / Security Engineering

• Strong networking and infrastructure fundamentals

• Comfortable across Linux and Windows environments

• Scripting/programming familiarity

• Experience with EDR/NDR or monitoring tooling

• Pragmatic mindset with strong operational judgement

• Able to balance security with business impact and usability

This is a strong fit for someone who enjoys operational ownership, improving systems incrementally and working closely with engineering/infrastructure teams rather than sitting in a siloed governance function.