Mercury is the European leader in construction solutions.

We build and manage complex engineering & construction projects for the world’s leading corporations. Our solutions help deliver technologies and life changing advancements that connect people, communities and businesses, giving them the power to achieve incredible things. Our people have the courage to be innovative. Their determination and sharp focus enable us to deliver with certainty, time and time again.

We deliver our clients’ visions through leading edge construction solutions across multiple sectors, including: Enterprise Data Centres, Advanced Technology & Life Sciences, Hyperscale Data Centres, Fire Protection.

At Mercury, it is our duty to encourage and back our people to realise their vision of themselves. We place them at the heart of what we do, providing challenging opportunities to develop within a great team in a supportive environment that allows them to reach their full potential.

Role Overview





The Commercial Administrator supports the Commercial Team in delivering effective commercial control across projects, ensuring all processes are organized, traceable, compliant, and aligned with Mercury procedures.

Working closely with Quantity Surveyors (QS), Commercial Leads, and Commercial Managers, this role is critical in managing commercial documentation, procurement administration, financial tracking, and reporting, particularly in fast-paced data centre environments.

Key Responsibilities of the Role:
Commercial Administration & Compliance
- Maintain structured and up-to-date commercial documentation and filing systems
- Control and track contracts, subcontracts, LOIs, POs, and change orders
- Manage commercial trackers (variations, subcontracts, procurement logs, payments)
- Maintain and track Authority Matrix approvals

Project & Commercial Support
- Support QS and Commercial Managers with daily commercial activities
- Prepare documentation for valuations, cost reports, and commercia

📌 Commercial Administrator (Madrid)
🏢 Mercury Engineering
📍 Madrid