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Senior Security Analyst

Job Posted: 20 days ago

Salary: £ Competitive
Job Type: Permanent
Location: GL4, Barnwood, Gloucestershire

Expire in: 8 days

Job Description

The Senior Security Analyst is a hands-on security operations role providing 24/7 operational coverage within a regulated financial services environment. You will own security incidents end-to-end, from detection through to investigation, response, and remediation coordination.

Operating within a small, senior team, you will also deliver proactive security activities including threat hunting, vulnerability management, and tooling validation—ensuring continuous improvement of the client’s security posture.

This role operates on a 24/7 shift pattern (12-hour shifts, 4-on / 4-off including nights and weekends).

Key Responsibilities

  * Monitor and investigate alerts across Microsoft Defender, SIEM, and security tooling

  * Own security incidents end-to-end, including investigation, containment, and resolution

  * Perform deep-dive investigations using KQL and multi-source telemetry

  * Correlate data across endpoint, identity, cloud, and network environments

  * Determine threat severity and risk aligned to client and regulatory context

  * Coordinate response actions with IT, cloud, and platform teams

  * Escalate complex incidents to security engineering or leadership where required

  * Conduct vulnerability scanning and review findings (e.g. Qualys)

  * Run breach and attack simulations and exposure validation (e.g. XM Cyber, AttackIQ)

  * Perform web application scanning and triage vulnerabilities

  * Execute proactive threat hunting aligned to MITRE ATT&CK

  * Optimise detection rules and reduce false positives

  * Validate and maintain security tooling effectiveness

  * Drive remediation actions through to completion across multiple teams

  * Produce clear documentation, incident reports, and audit-ready records

Experience & Knowledge

Essential:

  * Strong experience in security operations (incident detection, investigation, response)

  * Experience working with Microsoft Defender XDR and security tooling

  * Experience with SIEM platforms (ideally Microsoft Sentinel, KQL querying)

  * Strong understanding of threat detection, incident response, and root cause analysis

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

  * Knowledge of networking, operating systems (Windows/Linux), and security fundamentals

  * Strong analytical and problem-solving skills with ability to work independently

  * Experience collaborating with cross-functional technical teams

Desirable:

  * Experience with vulnerability management tools (e.g. Qualys)

  * Experience with attack simulation and exposure tools (AttackIQ, XM Cyber)

  * Knowledge of threat intelligence and malware analysis

  * Awareness of security frameworks (MITRE ATT&CK, NIST, ISO 27001)

  * Basic scripting knowledge (PowerShell, Python, Bash)

Before You Apply

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Bank details.
National Insurance number.
Date of birth.

You should not be asked for payment or irrelevant information. If you have concerns about a job advert or employer, seek guidance on how to proceed.

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