Senior Site Administrator

About the role

Mercury, the European leader in construction solutions, is looking for a Senior Site Administrator to ensure the smooth operation of its office in Mons, Belgium. You will support senior management, coordinate staff travel and accommodation, and maintain an efficient administrative environment for complex engineering projects.

Key responsibilities

• Manage staff travel, accommodation, and holiday rotas for senior on‑site personnel.
• Attend senior‑management meetings, record minutes and distribute them to relevant parties.
• Coordinate, order and maintain all office supplies and service agreements.
• Oversee the Administration, Payroll and Time Management team, ensuring accurate processing of high‑volume time‑keeping data.
• Maintain office systems, procedures and facilities to guarantee efficient daily operations.
• Collaborate with IT to order hardware, communicate replacements and manage IT service contracts.
• Provide professional secretarial support for client correspondence, proposals and presentation preparation.
• Work with HR to update and enforce office policies as needed.

Required profile

• Minimum 5 years of experience as an administrative assistant supporting senior management in a busy office.
• Relevant business qualification (Level 5 or higher) or equivalent.
• Experience in a fast‑paced construction environment.
• Proven ability to handle confidential information with professionalism.

Required skills

• Microsoft Outlook
• Microsoft Excel
• Microsoft Word
• Microsoft PowerPoint
• Microsoft OneNote
• Microsoft SharePoint
• SAP