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Security Architect

Security Architect

Hybrid

London, United kingdom

Freelance

03-12-2025

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Skills

Architecture

Job Specifications

Security Architect (Detection Engineering & Technical Lead)

London (onsite 4 days/week)

3 months - with extensions

Inside IR35 - Umbrella only

Active SC cleared or eligible candidates will be considered

Purpose: Technical owner of SIEM/XDR architecture, responsible for migrating LogRhythm to Sentinel, migrating AV to MDE, building detections, integrations, and automation, and shaping the SOC technology roadmap.

Key Requirements

Deep hands-on expertise with Microsoft Sentinel (KQL, analytic rules, UEBA, SOAR).
Proven experience migrating from LogRhythm or another legacy SIEM to Sentinel.
Strong experience building and tuning detections mapped to MITRE ATT&CK.
Experience migrating Trend Micro → Microsoft Defender for Endpoint.
Knowledge of integrating Trellix/McAfee, CyberArk, identity logs, cloud logs, and endpoint telemetry.
Ability to design ingestion pipelines, schemas, normalisation and enrichment.
Strong threat hunting and detection engineering background.
SC clearance desirable.

Profile needed: Senior SIEM/XDR engineer capable of architecting, building, and optimising a modern Microsoft-led SOC stack.

About the Company

Experis is a global leader in IT professional resourcing, project solutions and managed services. As the need for IT skills accelerates, we help organisations transform their digital infrastructure, enterprise applications, cloud and cyber security. Through Experis Academy, we deliver the powerful combination of in-demand technical skills together with the soft skills that are critical for business success. Experis is part of ManpowerGroup, a Fortune 500 Global Business and world leader in innovative workforce solutions. Know more