Must have Pipefitting/Plumbing experience** A large specialist building services and facilities management provider, are seeking a talented and motivated Mechanical Engineer to join a leading building services and facilities team, delivering high-quality residential projects across London. You’ll be involved in ensuring that all the mechanical systems within buildings — such as heating, ventilation, air conditioning (HVAC), plumbing, pumps, and other plant equipment — are operating safely, efficiently, and reliably. Provide technical expertise to support maintenance teams, oversee system upgrades, and help clients achieve energy efficiency, compliance, and cost savings across their properties. Key Responsibilities: * Oversee the operation, maintenance, and performance of mechanical building systems, including HVAC, boilers, pumps, chillers, and plumbing. * Manage planned preventative maintenance (PPM) schedules and coordinate reactive repairs to ensure minimal downtime. * Conduct fault-finding, diagnostics, and performance analysis to optimise system efficiency and reliability. * Ensure all mechanical systems comply with statutory and regulatory requirements, including Gas Safety, Pressure Systems, Legionella, and F-Gas. * Prepare and maintain technical documentation, asset registers, and maintenance records. * Collaborate with project managers, subcontractors, and site teams to deliver high-q...