Senior Cyber Security Analyst

About ENSEK ENSEK builds the cloud‑native SaaS software that’s transforming how energy retailers operate, innovate and manage at scale. We help retailers lower operating costs, improve billing accuracy for consumers, and enhance customer experience through automation and AI‑driven insight, all underpinned by modern, cloud‑native architecture. ENSEK is at an exciting inflection point as we scale at pace towards new international horizons. If you’re driven by solving complex, real‑world problems and want to build modern technology that accelerates the global energy transition, you’ll feel right at home with us. About the role As a Senior Cyber Security Analyst, you'll act as a technical authority within Security Operations, owning the design, development and continuous improvement of our detection and response capabilities. You'll lead the response to major security incidents, drive threat-informed detection engineering, influence security architecture decisions, and work closely with colleagues across Security, Engineering and Platform teams to ensure ENSEK remains resilient against evolving threats. This role combines hands-on technical expertise with leadership responsibilities, offering the opportunity to mentor junior analysts while contributing to strategic security initiatives across the business. Key responsibilities: Lead Security Incident Response by managing high-severity security incidents end-to-end, coordinating containment and recovery activities, conducting post-incident reviews, and acting as the senior technical lead during P1/P2 events. Own Detection & Response Capability through the design, development and optimisation of SIEM detections, maintaining MITRE ATT&CK coverage, improving detection effectiveness, and identifying gaps across ENSEK's security monitoring landscape. Drive Threat-Informed Security Operations by partnering with Threat & Vulnerability teams to operationalise threat intelligence, support vulnerability management activities, and ensure security operations remain aligned to ENSEK's evolving threat profile. Enhance Security Automation & Operational Efficiency through the development of playbooks, automated response workflows, alert enrichment capabilities, and tool integrations that reduce analyst effort and improve response times. Provide Security Leadership & Assurance by acting as the primary escalation point for Security Operations, mentoring analysts, supporting threat modelling activities, and providing security input into architectural and engineering decisions. Deliver Security Reporting & Compliance Support by owning operational metrics and performance reporting, communicating risk to stakeholders, and contributing evidence and control monitoring activities supporting ISO 27001, SOC 2 and NIS2 compliance requirements. Key outcomes: Maintain an effective detection and response capability, continuously improving SIEM coverage, reducing false positives, and identifying gaps…