Site Supervisor

Johnson Controls, a global leader in thermal management, mission-critical building systems, energy efficiency, and decarbonization, helps customers use energy more productively, reduce carbon emissions, and operate with the precision and resilience required in rapidly expanding industries such as data centers, healthcare, pharmaceuticals, advanced manufacturing, and higher education.

As the Site Supervisor, you will lead a team of on‑site engineers and subcontractors while also completing your own planned and reactive maintenance tasks. You will ensure the effective delivery of all fire detection, gas suppression, and mechanical suppression services across the site. 

You will be responsible for planned preventative maintenance, routine servicing, fault‑finding, and remedial works on a range of systems, including: 

• Conventional and addressable fire detection systems 

• Networked and graphical fire alarm systems 

• Gas extinguishing systems (e.g., Argonite, CO₂, Inergen, Novec) 

• Mechanical fire suppression equipment and fire extinguishers 

You will act as the primary on‑site point of contact, ensuring smooth operations, strong client relationships, and full compliance with site‑specific safety and quality standards. 

• Lead, support, and coordinate on‑site engineers and subcontractors 

• Build strong working relationships with the client and ensure high levels of customer satisfaction 

• Act as the main point of escalation for technical or operational issues 

• Monitor subcontractor performance and ensure all work meets required standards 

• Support the coaching, development, and onboarding of engineers and apprentices 

• Personally carry out maintenance, servicing, fault‑finding, and repairs on fire alarm systems 

• Support and oversee works on gas suppression and mechanical suppression systems 

• Perform integrity testing (training provided if required) 

• Assist with estimating, commissioning, and client training where required 

• Identify and communicate remedial works, system deficiencies, and upgrade opportunities 

• Ensure accurate completion of all on‑site documentation, daily work diaries, and service reports 

• Personally carry out maintenance, servicing, fault‑finding, and repairs on fire alarm systems 

• Support and oversee works on gas suppression and mechanical suppression systems 

• Perform integrity testing (training provided if required) 

• Assist with estimating, commissioning, and client training where required 

• Identify and communicate remedial works, system deficiencies, and upgrade opportunities 

• Ensure accurate completion of all on‑site documentation, daily work diaries, and service reports 

• Conduct safety and quality audits to ensure compliance with legislation and company standards 

• Ensure all engineers follow site‑specific safety and high‑hazard environment requirements 

• Promptly identify and report health and safety concerns, near misses, and site hazards 

• Attend mandatory training and maintain up‑to‑date certifications 

• Ensure full adherence to RAMS, PPE requirements, toolbox talks, van audits, and accident investigations 

• Promote a zero‑harm culture and drive continuous improvement in safety performance 

• Strong experience working with fire detection and fire alarm systems (primary skillset) 

• Experience with gas suppression systems 

• Understanding of mechanical fire suppression equipment 

• Ability and willingness to carry out hands‑on maintenance and servicing 

• Previous supervisory or team leadership experience 

• Excellent communication and customer service skills 

• Ability to inspire, influence, and build strong working relationships 

• Proactive approach to problem‑solving and unexpected situations 

• Full UK driving license 

• Flexibility to travel for training when required 

• Strong organisational skills and attention to detail 

• Experience in highly regulated or high‑hazard environments 

• Knowledge of passive fire protection 

• Experience coaching or developing engineers 

At Johnson Controls, we don’t just maintain systems — we help create safer environments. If you’re ready to take the next step in your career and lead a high‑performing team while remaining technically hands‑on, we’d love to hear from you. 

Apply now and join our team in Teesside. 

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