Senior Security Engineer, Threat Detection & AI Ops

Bestman Solutions. International; Greater London; On-site; GBP 89,000 - 156,000; Full time

Job summary

Bestman Solutions. International in London, United Kingdom, seeks a Senior Security Engineer to lead design and enhancement of security operations for a global investment firm.

The role focuses on threat detection, tooling improvements, automation, and AI integration within security operations. You will own detection engineering across SIEM/XDR, conduct proactive threat hunting, and support complex investigations while collaborating with IT, Legal, HR and senior stakeholders to drive operational

Qualifications

• 6+ years of experience in security engineering or operations.
• Hands-on with SIEM/XDR technologies and query languages (KQL/SPL).
• Automation skills with Python and PowerShell.

Responsibilities

• Design and optimise detection rules across SIEM and XDR.
• Improve log-source coverage and alert accuracy.
• Develop security automation using Python/PowerShell.
• Review tooling for configuration, integration and operational improvements.
• Threat hunting across endpoint, identity, cloud and SaaS environments.
• Support incident response and investigations.
• Apply AI-assisted security capabilities for better detection and response.
• Develop detections for AI-related threats (prompt injection, data leakage, AI phishing).
• Collaborate with IT, Legal, HR and leadership on incidents and improvements.

Skills

SIEM/XDR

KQL

SPL

CrowdStrike

Python

PowerShell

Threat hunting

Endpoint security

MITRE ATT&CK

AI in security

Tools

CrowdStrike

Microsoft 365 security

Job description

Bestman Solutions. International in London, United Kingdom, seeks a Senior Security Engineer to lead design and enhancement of security operations for a global investment firm.

The role focuses on threat detection, tooling improvements, automation, and AI integration within security operations. You will own detection engineering across SIEM/XDR, conduct proactive threat hunting, and support complex investigations while collaborating with IT, Legal, HR and senior stakeholders to drive operational