Portsmouth - hybrid (2-3 days on-site per week)PermanentUp to £78,500 + bonusThis is a prime opportunity to design and engineer the core platforms behind a rapidly growing Security Operations Centre (SOC), blending hands-on technical work with automation and solution design. You''ll collaborate with analysts, architects, and customers to build reliable, scalable systems that accelerate threat detection and response, all in a collaborative culture that invests in your growth, wellbeing, and career progression. Job Title: Senior Security Engineer Job Type: Permanent Salary: Up to £78,500 (DOE) + Bonus Working arrangement: Hybrid Office Location: PortsmouthAs a Senior Security Engineer, you will: Design, deploy, and maintain core SOC technologies (SIEM, EDR, SOAR, threat intelligence, and logging infrastructure). Develop and optimise detection use cases, correlation rules, and analytics content. Build and maintain automation workflows and integrations using automation platforms or custom Scripting. Engineer secure log ingestion pipelines across hybrid cloud and on-prem environments. Support client onboarding, threat hunting, detection engineering, and process improvements. Mentor junior engineers and maintain documentation, diagrams, and standards. Required Experience/Skills: 5 years'' experience in a SOC, security engineering, or cyber operations role. Strong hands-on experience with SIEM or EDR platforms (eg, Microsoft Sentinel, Splunk, Defender, CrowdStrike, Elastic). Exp