Onsite Engineer - London (Within M25)- 40k to 45k - Monday to Friday - 40 hours a week - weekends OT available -Location: Central London (site-based)Salary: 45,000 (negotiable depending on experience)Hours: Monday to FridayContract: Full-time, PermanentAbout the RoleWe''re seeking a proactive and technically capable Onsite Engineer to support a long-term, high-security project based in Central London. This is a two-year programme with a gradual transition from team-based support to independent working, offering a unique opportunity to be part of a critical infrastructure environment.The role involves supporting and maintaining large-scale integrated security systems, including CCTV, access control, and perimeter detection. While the day-to-day pace is steady, the environment is highly secure and requires a detail-oriented, dependable engineer who can work autonomously and communicate effectively with stakeholders.Key DetailsBased on-site in Central London (Westminster Embankment area)Monday to Friday schedule5-10 weekend shifts available annually (first refusal given to this role)One Field Engineer visits the site weekly for additional support2-week turnaround for onboarding and clearance processMust be eligible for DV clearance (British citizen or born in the UK with a British passport)Key ResponsibilitiesRespond to daily fault requests and complete planned preventative maintenance (PPM)Support out-of-hours reactive duties as requiredMaintain and repair high-end integrated