Senior Security Engineer
CV-LibraryLondonpermanentPosted: 28 May 2026
Apply NowThe 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)
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)