Leading Security Installation organisation seeks an experienced Senior Security Engineer to install, service and maintain intruder alarms, CCTV and access control systems across customer sites, ensuring full compliance with Company and BS EN/PD standards. This multi‑skilled role requires strong technical ability, on‑site leadership and the capability to support the Engineering Manager with operational decisions and problem‑solving. Successful candidates for the Senior Security Engineer will demonstrate extensive experience across security systems, a proactive “can do” attitude and the ability to work independently as well as within a wider engineering team. BS7858 security screening and a full clean UK driving licence are essential. Occasional overnight stays required. The role covers the North London/Hertfordshire/Slough/Thames Valley/M40 corridor. Duties of Senior Security Engineer: * Install, service, commission and maintain intruder alarms, CCTV and access control systems to current BS EN/PD standards * Diagnose faults across all security disciplines and carry out effective repairs and corrective actions * Complete small works, system upgrades and equipment replacements as required * Lead on customer sites where required to ensure projects are delivered on time and to exceptional quality * Support the Engineering Manager with operational decisions, technical problem solving and s...