Commissioning Engineer

Locations: 1 position in Hertfordshire / 1 position in Surrey
Rate: £450-£500 per day
IR35: Outside IR35
Sector: Water & Wastewater

We are currently looking for experienced Commissioning Engineers to work on major water and wastewater process engineering projects in Hertfordshire and Surrey.

The successful candidates will have a strong background in commissioning and installation within the water industry, with experience working for a main contractor across multi-discipline M&E and process engineering projects.

Key Responsibilities

• Oversee commissioning and systems integration activities throughout the project lifecycle, from design through to handover.

• Develop and manage commissioning plans, procedures and associated documentation.

• Coordinate installation and commissioning activities with subcontractors, suppliers, design teams and third-party engineers.

• Lead and witness Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT) in line with ITPs.

• Ensure equipment is FAT tested, snag-free and ready for site delivery.

• Undertake hands-on commissioning activities, including configuration and calibration of analytical equipment and integration with monitoring systems.

• Supervise and inspect subcontractor installations, ensuring compliance with quality standards, RAMS and ITPs.

• Review and interpret electrical/mechanical schematics, FDS and P&IDs, identifying and initiating design changes where required.

• Manage defects, snagging and close-out through to successful handover.

• Capture and maintain accurate installation, testing and commissioning records.

• Monitor supply chain performance against KPIs/KPMs and drive continuous improvement.

• Contribute to project programmes and manage commissioning inputs, changes and updates.

• Provide regular progress reports and technical updates to senior management and the Core Management Team.

• Support Early Contractor Involvement (ECI) through site surveys, system reviews and technical input.

• Promote and implement SHEQ and behavioural improvement initiatives.

• Deliver training to client operations and maintenance teams on new process plant and equipment.

• Act as a front-line supervisor during installation and commissioning phases.

• Undertake either an Electrical Authorised Person (AP) or Mechanical AP role, subject to assessment and training.

• Apply structured commissioning methodologies and best practice across water and wastewater processes.

• Troubleshoot technical issues and provide effective, analytical solutions.

• Ensure all commissioning activities are delivered safely, compliantly, to programme and to the required quality standards.

Requirements

• Previous experience working for a main contractor on water and wastewater process engineering projects.

• Minimum 3 years’ experience, preferably in a commissioning role within the water industry.

• HNC/Degree in an appropriate engineering discipline, or an engineering apprenticeship/NVQ with relevant multi-discipline engineering experience.

• Proven experience delivering installation and commissioning projects through to handover.

• Strong understanding of electrical and mechanical installation and commissioning processes.

• Good knowledge of relevant standards, safety rules and statutory legislation.

• Strong engineering and technical understanding across multi-discipline projects.

• Ability to lead site teams when required and work effectively with subcontractors and third parties.

• Excellent communication skills, particularly in client-facing environments.

• Ability to work independently, self-manage and operate in a structured and organised manner.

• Proactive approach with the confidence to challenge issues and identify value engineering opportunities.

• Meticulous approach to documentation and technical delivery.

Required Qualifications

• ECS/CSCS card

• Water Hygiene

• SSSTS or SMSTS

• BS7671 18th Edition

• First Aid at Work

CompEx qualifications are preferred.

This is a key role in ensuring the safe, compliant and timely delivery of commissioning activities. The position requires a technically strong individual who can take ownership of commissioning, installation and systems integration while working closely with the wider project team and client.

£450-£500 per day | Outside IR35 | Hertfordshire or Surrey

If you have the relevant water industry commissioning experience and are available for a new contract, please get in touch.