Accounting & Administration Officer

Accounting & Administration Officer

THEON International

Zaventem, Belgium

Role Summary

To support our growing activities in Belgium, we are hiring an Accounting & Administration Officer who combines solid accounting expertise with hands-on administrative and HR support. You will play a key role in accurate financial administration while helping to build HR and administrative processes from the ground up in a ramp‑up factory environment, ensuring Belgian compliance across finance, payroll liaison and general admin. You will work closely with finance, warehouse operations, local management, and external partners.

Key Responsibilities

Accounting & Finance:

• Assist with daily bookkeeping and accurate data entry in Microsoft Dynamics 365 (D365);
• Support inventory accounting and perform warehouse stock reconciliations;
• Prepare, maintain, and organize financial records (e.g. invoices) and supporting documentation;
• Assist with monthly and annual financial closings;
• Prepare, support, and file Intrastat declarations;
• Issue customer invoices in a timely and accurate manner;
• Upload supplier and customer invoices to the PEPPOL system;
• Collaborate closely with warehouse operations on financial and cost-related matters.

Administration & HR Support:

• Support HR administration for the Belgian entity in line with Belgian labor law;
• Manage and maintain personnel files, contracts, and HR documentation;
• Support onboarding and offboarding processes;
• Act as a local point of contact for questions related to Belgian HR regulations (social legislation, absences, benefits, etc.);
• Liaise with external payroll providers, HR advisors, and social secretariats;
• Ensure correct administrative follow-up of salaries, benefits, and employment-related documentation;
• Support internal audits and compliance requirements related to HR and administration.

Profile

• Bachelor’s degree in Accounting, Finance, Business Administration, or a related field;
• Minimum 3 years of relevant experience in accounting and administrative/HR support roles;
• Solid working knowledge of Belgian accounting, VAT and HR regulations;
• Experience with ERP systems; Microsoft Dynamics 365 experience is a strong asset;
• Strong organizational skills, attention to detail, and discretion;
• Proactive, reliable, and comfortable working independently;
• Fluent in English; knowledge of French and/or Dutch is a strong advantage.