2nd/3rd Line Security Analyst - Reading

2nd / 3rd Line Security Analyst

Location: Reading (Hybrid)

Salary: £50,000 – £60,000

Our client is looking for a 2nd/3rd Line Security Analyst to join their Security Operations Centre as a senior technical escalation point. This is a genuinely hands-on role - ideal for someone who wants to keep working close to the tooling and the day-to-day operational workload rather than move straight into a purely managerial or architectural position. You'll own complex incidents end-to-end, drive detection engineering and automation, and provide senior technical depth across the SOC.

Duties of the Role

• Own complex security incidents end-to-end - from alert validation through investigation, containment and closure
• Act as the senior escalation point when earlier-stage investigations stall, reviewing prior work and coaching the original analyst
• Investigate identity and cloud-based compromise (e.g. anomalous sign-ins, malicious OAuth consent, mailbox access), including session/token revocation
• Design, build and test SIEM detection rules mapped to MITRE ATT&CK, and tune out false positives without blanket whitelisting
• Build automation for SOC processes - enrichment, ticketing, containment - using Python, Logic Apps, APIs or a SOAR platform
• Correlate evidence across SIEM, endpoint, identity and cloud platforms (Sentinel, Defender XDR, CrowdStrike, Entra ID, Microsoft 365, AWS) to scope the full blast radius of an incident
• Run hypothesis-led threat hunts, not just reactive alert triage
• Mentor junior analysts and help drive measurable improvements to SOC detections, playbooks and workflow

What we're looking for

• Proven, personal ownership of complex security incidents from triage through to closure
• Hands-on experience writing and tuning SIEM detection logic, with a solid understanding of MITRE ATT&CK and KQL (or equivalent)
• Practical scripting/automation experience (Python, Logic Apps, REST APIs) or hands-on SOAR platform configuration
• Working knowledge of several of: Microsoft Sentinel, Defender XDR, CrowdStrike, Microsoft Entra ID/Azure AD, Microsoft 365, AWS security tooling
• Experience investigating identity and cloud-based compromise, including OAuth consent abuse and Conditional Access/MFA
• A track record of proactive, hypothesis-driven threat hunting
• Strong investigative writing skills, with the ability to explain technical findings to non-technical stakeholders
• Comfortable acting as a technical escalation point, including reviewing and correcting the work of other analysts constructively

Nice to have

• Security certifications (e.g. SC-200, GCIH, GCFA, CySA+ or equivalent)
• Experience mentoring or formally training junior SOC analysts
• Exposure to non-Microsoft cloud, EDR or SIEM tooling
• Familiarity with SOAR platforms beyond Logic Apps (e.g. Sentinel Automation, Tines, Cortex XSOAR)