ΤHEON GROUP of companies develops and manufactures cutting-edge night vision and thermal Imaging systems for Military and Security applications with a global footprint. THEON GROUP started its operations in 1997 from Greece and today occupies a leading role in the sector thanks to its international presence through subsidiaries and production facilities in Greece, Cyprus, Germany, the Baltics, the United States, the Gulf States, Switzerland, Denmark, Belgium, Singapore and South Korea. THEON GROUP has more than 260,000 systems in service with Armed and Special Forces in 73 countries around the world, 26 of which are NATO countries. THEON INTERNATIONAL PLC, the group's parent company, has been listed in the EURONEXT stock market, allowing THEON GROUP to accelerate its growth and further future business development. www.theon.com

Role Summary

We are seeking a motivated and detail‑oriented Accounting Assistant to join our Finance team, who will bring strong technical knowledge, hands‑on experience in accounting operations, and the ability to thrive in a dynamic, fast‑paced environment.

Key Responsibilities

• Posting and reconciling accounting entries and supporting documents for Group companies operating abroad
• Managing daily bookkeeping tasks (AP/AR, general ledger, expenses)
• Collaborating closely with external accountants in different countries to support monthly accounting processes
• Reviewing, understanding, and organizing accounting files prepared under local accounting standards
• Assisting in the transformation of foreign accounting data into the Greek General Ledger format
• Recording transformed data into the Group’s internal accounting system
• Assisting with tax filings, VAT, withholding taxes, and compliance procedures
• Working with ERP systems to maintain accurate financial data (Microsoft Dynamics 365 preferred)
• Supporting the preparation of financial reports and monthly closings
• Collaborating with internal teams to ensure smooth financial processes

Education & Experience

• Bachelor’s degree in Accounting, Finance, or related field (AEI/TEI)
• Minimum 2 years of experience in an accounting/finance role, ideally in a corporate accounting department or accounting firm
• Solid understanding of double‑entry bookkeeping and tax framework

Technical Skills

• Strong proficiency in MS Excel (functions, pivot tables, data validation)
• Experience working with ERP systems  Microsoft Dynamics 365 is a plus
• Familiarity with Greek tax regulations and electronic books (myDATA)
• Ability to prepare and interpret basic financial reports

Soft Skills

• Excellent organizational skills and attention to detail
• Analytical thinking and problem‑solving attitude
• Ability to take initiative and work efficiently under deadlines
• Strong communication skills and team‑oriented mindset
• Very good command of English (written and spoken)