Company Description Sia is a next-generation, global management consulting group. Founded in 1999, we were born digital. Today our strategy and management capabilities are augmented by data science, enhanced by creativity and driven by responsibility. We're optimists for change and we help clients initiate, navigate and benefit from transformation. We believe optimism is a force multiplier, helping clients to mitigate downside and maximize opportunity. With expertise across a broad range of sectors and services, our 3,000 consultants serve clients worldwide from 48 locations in 19 countries. Our expertise delivers results. Our optimism transforms outcomes. Job Description Sia is looking for a motivated student to support our HR and Office Management activities in Brussels, Boulevard de Waterloo 16. You will work closely with the HR Manager, HR and Talent Acquisition Officers, the Sia management team, and the consultants, of course, on daily operations and transversal projects, gaining hands‑on experience in office management, HR administration, recruitment & onboarding support, fleet management, and internal communication. Main tasks: Office Management & Facilities Serve as a point of contact for employees and visitors at the office (reception, basic information, orientation) Support the day‑to‑day office operations: supplies, badges, mail, deliveries, meeting rooms Support the fleet management (mainly laptops and phones) Assist in the coordination with external suppliers (cleaning, maintenance, IT equipment, catering, etc.) Participate in small internal events logistics (breakfasts, afterworks, celebrations) Help ensure that the office environment is welcoming and well‑organized Contribute to internal communication Perform other ad‑hoc tasks to support the HR and Office Management team HR Administration & Support Assist with the preparation, filing and updating of employee records and HR documents (contracts, annexes, certificates, etc.) Help maintain and update HR databases and HRIS tools (personal data, absences, holidays, etc.) Support the preparation of documents for payroll Support data entry and consolidation in Excel or other tools Recruitment & Onboarding Publish job ads on various platforms and manage applications (screening CVs, updating tracking files) Schedule interviews with candidates and hiring managers Prepare onboarding documents and welcome packs for new hires and interns Help organize onboarding sessions and support new employees during their first days In return, you can expect: Student job / internship with compensation according to Belgian regulations Real responsibilities from day one Strong learning opportunities and professional development International & multicultural environment that gives importance to diversity, inclusion, employee well-being and corporate social responsibilities actions. A great and modern working atmosphere with friendly and professional colleagues where innovation and entrepreneurship are encouraged Flexible & student‑friendly conditions Compensation in line with Belgian student contract / internship regulations Qualifications Currently enrolled in a Bachelor's or Master's degree, preferably in: Human Resources Management, (Organizational) Psychology, Social Sciences Office Management, Management Assistant, Business Administration Or another relevant field Eligible for a student contract in Belgium / internship through University and be available part-time (tbd) for a period of 3 to 6 months starting January 2026 Languages: Trilingual French, Dutch and English. Based in or near Brussels Outstanding collaborative team player and good communication skills Strong interest in HR Strong organizational and multitasking skills Autonomous, dynamic, and committed Attention to detail and reliability in handling confidential information Good communication skills, both written and verbal Proactive, hands‑on, willing to learn and take initiative Comfortable working in a dynamic, multicultural environment Additional Information We are unable to provide a work permit for this position. Sia is an equal opportunity employer. All aspects of employment, including hiring, promotion, remuneration, or discipline, are based solely on performance, competence, conduct, or business needs. Sia is an equal opportunity employer. All aspects of employment, including hiring, promotion, remuneration, or discipline, are based solely on performance, competence, conduct, or business needs.