We are looking for a mature and autonomous Office Manager who enjoys being closely involved in the business and takes initiative with confidence. In this role, you will support the day-to-day operations of a fast-growing, international HR group with office in Zaventem and help ensure everything runs smoothly behind the scenes. Office & Facilities Management: You manage suppliers and vendors, office supplies and marketing materials, facilities and maintenance, gifts, and the company car fleet. Administration & Contracts: You prepare and follow up contracts (consultants and clients), handle purchase orders and timesheets, and support the invoicing and billing process. Communication & Front Office: You monitor shared mailboxes (info, office, personal) and handle incoming phone calls in a professional way. Events & Travel: You plan and co-organize company events (team buildings, Christmas parties, BBQs, …) and arrange business travel (transport, accommodation, itineraries). Onboarding, Offboarding & Ad Hoc Support: You coordinate the practical side of onboarding and departures and provide flexible support for urgent matters and ad hoc projects (e.G. RFPs, data collection, process improvements). You are a mature and autonomous professional who likes to be involved in the business You are not afraid to take initiative or make suggestions You have experience in a similar role as Office Manager, Management Assistant, PA or EA. Not familiar with all aspects of the role yet, but eager to learn? You are still welcome to apply You are comfortable working with MS Office, especially Outlook You have a professional level of Dutch, French and English You have an affinity with numbers and work accurately A part-time role (3 to 4 days per week) A very varied position at the heart of a strongly growing international group An employer that values a pleasant work environment and team spirit A position in which you can grow, with the possibility to broaden your responsibilities in line with your competencies, ambitions and the growth of the organisation Parties, Billing, Onboarding, Itineraries, MS Office Suite, Administration, Communication, Business Travel, Accommodation, Business, Offboarding, Transport, Office supplies, Mailboxes, Ad Hoc Projects, Gifts, Supplier Management, Practicality, Contracts, Coordination, Company Events, MS Outlook, Reception, Management, Purchase Orders, Marketing Material, Facility management, Billing Process, Data acquisition, Initiative taker, Process Development, Vendors