Job Description:

Commissioning Engineer (Water & Wastewater)

Location:, London, EC3A

Position Type: Full-Time

About the Role

Are you a skilled Commissioning Engineer looking to join a high-performing engineering team based in the heart of London? We are seeking a proactive, detail-oriented engineer to drive full-lifecycle commissioning, systems integration, and technical site leadership across water and wastewater process engineering projects.

Operating from our flagship office at 70 St Mary Axe, you will act as a key technical liaison between design teams, supply chains, and site operations ensuring end-to-end quality, compliance, and flawless handover on critical infrastructure projects.

Key Responsibilities

• Full Lifecycle Commissioning: Develop commissioning plans, lead FAT/SAT testing, calibrate analytical equipment, and manage defect close-out from design through to handover.
• Site Supervision & Quality Control: Oversee subcontractor installations, witness testing against ITPs, approve RAMS, and deliver snag-free, high-quality execution.
• Design & System Integration: Review and interpret electrical/mechanical schematics, FDS, and P&IDs; troubleshoot issues; and initiate design modifications where required.
• Early Contractor Involvement (ECI): Perform site surveys and system reviews to shape early project scope and value engineering decisions.
• Stakeholder Management & Reporting: Monitor supply chain performance, provide core management team updates, write client reports, and deliver training to client O&M teams.
• Authorised Person Duties: Undertake either an Electrical or Mechanical Authorised Person (AP) role (subject to assessment and training).

What We Are Looking For



Experience & Qualifications

• Industry Experience: Minimum 3 years in a commissioning role within Water & Wastewater Process Engineering, specifically with a main contractor.
• Education: HNC/HND, Degree in a relevant engineering discipline, or an Engineering Apprenticeship & NVQ within a multi-disciplinary environment.
• Professional Registration: Professional membership (e.g., IET, IMechE) is highly desirable.

Required Certifications

• ECS (CSCS) Card
• EUSR Water Hygiene Card
• SSSTS or SMSTS
• BS7671 18th Edition Wiring Regulations
• First Aid at Work
• (Desirable) CompEx Qualifications

Key Competencies

• Strong knowledge of electrical and mechanical contractor commissioning processes.
• Meticulous approach to documentation, safety (SHEQ), and technical compliance.
• Exceptional communication skills-approachable with clients and effective at leading site teams.

How to Apply

If you have the technical expertise and leadership drive to deliver complex water engineering projects safely and efficiently, submit your CV and a brief cover letter today.

Randstad CPE values diversity and promotes equality. No terminology in this advert is intended to discriminate against any of the protected characteristics that fall under the Equality Act 2010. We encourage and welcome applications from all sections of society and are more than happy to discuss reasonable adjustments and/or additional arrangements as required to support your application.

Candidates must be eligible to live and work in the UK.

For the purposes of the Conduct Regulations 2003, when advertising permanent vacancies we are acting as an Employment Agency, and when advertising temporary/contract vacancies we are acting as an Employment Business.