Senior Security Engineer

Claranet
London, United Kingdom
2 days ago
Job Type
Permanent
Work Pattern
Full-time
Work Location
Hybrid
Seniority
Senior
Education
Degree
Security Clearance
Required
Posted
28 May 2026 (2 days ago)

Benefits

25 days holiday Pension Private healthcare

The Role

The Senior Security Engineer is responsible for the day-to-day operation, maintenance, and optimisation of security platforms supporting a financial services client in a regulated environment.

This is a hands-on engineering role where you will ensure security tooling is fully operational, integrated, and performing as expected. You will work closely with the 24/7 Security Analyst team, supporting investigations, resolving platform issues, and driving improvements across detection and response capabilities.

This role is client-aligned with ~3 days onsite in London.

Key Responsibilities

* Maintain and configure security platforms including SIEM, XDR/EDR, vulnerability and cloud security tooling

* Perform lifecycle activities including patching, upgrades, and configuration changes

* Ensure security platforms are fully integrated across on-prem and cloud environments

* Monitor platform health, performance, and availability, resolving issues proactively

* Support service transitions, upgrades, and controlled change activities

* Act as escalation point for platform issues raised by the Security Analyst team

* Provide engineering support during complex incidents and investigations

* Implement platform-level changes to support incident response and remediation

* Support detection engineering including rule deployment, tuning, and validation

* Resolve data quality, alerting, and detection gaps impacting operational effectiveness

* Support automation and SOAR initiatives (e.g. Sentinel, Logic Apps)

* Collaborate with SOC providers to maintain SIEM configuration and log ingestion

* Maintain accurate engineering documentation, runbooks, and platform records

* Ensure all platforms meet regulatory, audit, and compliance requirements

* Contribute to governance, reporting, and continuous improvement initiatives

Experience & Knowledge

Essential:

* Strong experience in security engineering and platform management

* Experience supporting SOC tooling and security operations environments

* Hands-on experience with Microsoft Defender and Microsoft Sentinel

* Strong understanding of SIEM, XDR, and security platform integrations

* Experience in hybrid (on-prem and cloud) environments

* Strong troubleshooting skills across platforms, integrations, and data pipelines

* Experience with scripting/automation (PowerShell, Python or similar)

* Strong understanding of networking, cloud, and infrastructure fundamentals

* Experience in regulated environments (e.g. financial services)

* Strong documentation and communication skills

Desirable:

* Experience with vulnerability and scanning tools (e.g. Qualys)

* Familiarity with exposure management and BAS tools (XM Cyber, AttackIQ)

* Knowledge of DLP, email security, and cloud security platforms

* Awareness of PAM and data security tools (e.g. CyberArk, Varonis)

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