Are you an experienced Pre-Commission Cleaning / Water Treatment Engineer? We are looking for a skilled Engineer to deliver closed system flushing, water hygiene, and compliance services across London and the surrounding areas. This role will suit someone with strong knowledge of BSRIA standards, hands-on experience in pre-commission cleaning, and the ability to work safely, efficiently, and to the highest quality. If you re an experienced Engineer in water treatment and pre-commission cleaning looking for a role with excellent benefits and long-term prospects, this is the position for you. Remuneration £30,000 £45,000 (depending on experience) Monday Friday, 8am 5pm (overtime available) Company vehicle provided Uniform, laptop/tablet supplied Pension scheme Annual pay reviews Holiday pay Responsibilities Carry out pre-commission cleaning of closed systems (conventional flushing and CPC filtration). Perform water hygiene tasks including TMV servicing, calorifier inspections, and tank cleaning/disinfection. Review schematics and drawings, complete risk assessments, and submit accurate site documentation. Ensure compliance with BSRIA BG29/2021, BG50/2021 and other industry standards. Operate safely in line with COSHH procedures and company health and safety policies. Maintain company vehicles, equipment, and site safety standards. Requirements Minimum 3 years experience in pre-commission cleaning. Proven experience with conventional and CPC fil