Senior Mechanical Project Engineer

ACCIONA is a global company, leading in the development of regenerative infrastructure that creates a positive impact on society. Our workforce consists of more than 65,000 professionals, present in more than 40 countries across the five continents, all contributing in our mission to design a better planet. Are you a passionate individual who wants to make a difference, promote sustainable development, and find solutions to the biggest global challenges including climate change, overpopulation, and water scarcity? Come and join us in building the infrastructure our planet needs to achieve a sustainable future.

We are seeking two experienced Senior Mechanical Project Engineers to join the Technical Office team on the Thames Water Coppermills Resilience Project.

Supporting the Mechanical Construction Manager, you will play a key role in the delivery of major mechanical work packages from detailed design through procurement, construction, commissioning, and handover. Working closely with designers, suppliers, subcontractors, procurement teams, and site delivery personnel, you will ensure that mechanical installations are delivered safely, efficiently, and in line with project objectives.

This role will focus on large-diameter metallic pipework systems and major process equipment, including pumps, surge vessels, pressure vessels, valves, and associated mechanical infrastructure. It offers an excellent opportunity to take ownership of critical packages on one of Thames Water's flagship resilience projects.

Job Description

Key Responsibilities

As a Senior Mechanical Project Engineer, you will:

• Support the delivery of mechanical work packages throughout design, procurement, construction, commissioning, and handover phases.

• Manage day-to-day engineering and coordination activities for major mechanical installations.

• Review drawings, specifications, scopes of work, and Bills of Quantities (BOQs) to ensure alignment with project requirements.

• Develop, review, and maintain mechanical work packages, technical documentation, and scopes of work.

• Manage technical queries, design clarifications, engineering changes, and interface coordination.

• Coordinate activities between engineering, procurement, subcontractors, suppliers, and construction teams.

• Support mechanical completion, testing, commissioning, and asset handover activities.

• Assist with tender evaluations, subcontractor appointments, and supplier management.

• Review subcontractor methodologies, programmes, and resource plans to ensure successful delivery.

• Monitor subcontractor performance and support the resolution of technical, commercial, and delivery challenges.

• Review construction methodologies and RAMS, providing practical constructability input.

• Monitor progress against programme milestones and support project controls, reporting, forecasting, and risk management activities.

• Participate in technical workshops, coordination meetings, and stakeholder engagement activities.

• Support safe working practices, quality standards, and continuous improvement across the project.

Required Skills and Competencies

Essential Requirements

To be successful in this role, you will have:

• A degree in Mechanical Engineering or an equivalent engineering qualification.

• A minimum of 5 years' experience delivering mechanical works on major infrastructure, water, utilities, industrial, or energy projects.

• Experience managing mechanical subcontractors through procurement, construction, and delivery phases.

• Strong technical knowledge of large-diameter metallic piping systems.

• Practical experience installing pumps, valves, surge vessels, pressure vessels, and associated mechanical process equipment.

• Experience preparing and reviewing Scopes of Work (SOW), Bills of Quantities (BOQ), technical specifications, and tender documentation.

• Ability to develop and manage mechanical work packages and technical documentation.

• Experience reviewing engineering drawings, specifications, and construction methodologies.

• Knowledge of construction planning, progress monitoring, and project reporting processes.

• Understanding of change management, risk management, and contract administration principles.

• Strong communication, organisational, and stakeholder management skills.

• Full UK driving licence.

Desirable Qualifications & Experience

The following would be advantageous:

• Experience working on Thames Water or other UK water utility projects.

• Experience supporting mechanical completion, testing, commissioning, and handover activities.

• Knowledge of the Construction (Design and Management) Regulations 2015 (CDM 2015).

• Experience working under NEC contracts, including compensation events and change management processes.

• SMSTS qualification.

• EUSR National Water Hygiene Card.

• Thames Water Safety Passport.

• Relevant CSCS Card.

• Temporary Works Supervisor (TWS) or Temporary Works Coordinator (TWC) qualification.

• Confined Space Awareness or Entry Training.

As a company that values diversity as a source of talent, we work to foster an inclusive environment that promotes respect, belonging and engagement so that all people can participate on an equal opportunity basis. We invite everyone to apply regardless of origin, circumstances, background or condition.