Mechanical Site Supervisor

First Recruitment Group; Greater London; On-site; GBP 45,000 - 65,000; Full time

Job summary

First Recruitment Group is seeking a Mechanical Site Supervisor (Authorised Person) to oversee mechanical AP activities at a Beckton site in London. The role reports to the Senior Commissioning Manager and focuses on safe, on-time delivery with quality documentation across the project lifecycle.

The incumbent will maintain AP status, supervise pipework installation, and ensure compliance with ITPs, drawings, and procedures while coordinating with subcontractors and site personnel.

Qualifications

• Experience in energy, utilities, water or industrial sectors.
• Ability to assess welding quality and inspect mechanical works.
• Experience operating in an Authorised Person (AP) role.
• Strong interpretation of project drawings and documentation.

Responsibilities

• Support Site Manager to maintain safe working environment for staff, subcontractors and visitors.
• Achieve and maintain Authorised Person (AP) status via Mechanical AP assessment.
• Ensure Health, Safety and Environmental documentation is current and reviewed.
• Carry out mechanical isolations per project requirements.
• Manage Mechanical ITPs and ensure quality inspections.
• Review and feedback on Method Statements and Work Instructions.
• Supervise works to ensure compliance with procedures and specs.
• Monitor progress using drawings and reporting tools.
• Record non-conformances and drive corrective actions.

Skills

Site supervision

Drawings interpretation

Health & safety

Quality assurance

Education

HNC/HND in Mechanical Eng

Apprenticeship in pipework & welding

SSSTS

CSCS Card

First Aid qualification

Job description

Mechanical Site Supervisor (Authorised Person)

Contract: Inside IR35

About the Role

We are looking to strengthen our Construction team with a Mechanical Site Supervisor (Authorised Person) based in Beckton.

Reporting to the Senior Commissioning Manager, you will be responsible for supervising and controlling all mechanical AP site activities, ensuring work is delivered safely, efficiently, to specification, and within programme. You will play a key role in maintaining quality standards, ensuring all inspections, testing, and documentation are completed throughout the project lifecycle.

Key Responsibilities

• Support the Site Manager in maintaining a safe working environment for employees, subcontractors, and visitors.
• Achieve and maintain Authorised Person (AP) status through the company's Mechanical AP assessment process.
• Ensure all relevant Health, Safety and Environmental documentation is received, reviewed, and maintained at the latest revision.
• Carry out and manage mechanical isolations in line with project requirements.
• Manage and maintain Mechanical Inspection & Test Plans (ITPs).
• Review project documentation to ensure works are fully defined and understood before execution.
• Review and provide feedback on Method Statements and Work Instructions.
• Supervise works to ensure compliance with approved procedures and specifications.
• Monitor and record project progress using drawings and other reporting tools.
• Identify, record, and manage non-conformances and improvement opportunities, ensuring corrective actions are implemented.
• Ensure a high-quality installation is achieved with all ITPs completed as works progress.

Experience

• Previous experience working within the Energy, Utilities, Water, or Industrial sectors.
• Strong understanding of pipework fabrication, welding, and mechanical installation.
• Ability to assess welding quality and inspect mechanical works.
• Experienced in snagging and punch-listing pipelines using Isometric, GA, and P&ID drawings.
• Previous experience operating in an Authorised Person (AP) role.

Skills & Knowledge

• Strong understanding of mechanical installation and commissioning processes.
• Knowledge of inspection, testing, and quality assurance requirements.
• Ability to interpret technical drawings and project documentation.
• Excellent communication and site supervision skills.
• Commitment to maintaining the highest standards of health, safety, and quality.

Qualifications

• HNC/HND in Mechanical Engineering, or
• Recognised apprenticeship in pipework and welding, supported by relevant industry experience.
• SSSTS
• CSCS Card
• First Aid qualification
• Essential: Must hold current Mechanical Authorised Person (AP) status

As part of putting people first, we strive to be an equal opportunities employer and we are always looking to increase the diversity of our workforce, working closely with our clients to ensure everyone is included.