Billing Manager

Join our team at Rheinmetall 4iG Digital Services (R4), a fast-growing international IT services company where innovation, impact, and opportunity come together! R4 was founded by Rheinmetall, a leading international systems supplier in the defence industry, and 4iG, Hungary's leading integrated service provider in telecommunications, systems integration, space and defence industry. Besides delivering high-impact IT projects and services to Rheinmetall's subsidiaries worldwide, 2026 marks an exciting new chapter, as we extend our reach beyond the global Rheinmetall IT organisation and enter the broader market, offering our expertise to external customers as well. Headquartered in Budapest, we combine the stability of a large international enterprise with the agility of a delivery-focused organisation. Built on strong foundations and guided by clear strategic goals, we are continuously expanding our service portfolio. Backed by two major industry groups and shaped by an international outlook, we offer an inspiring work environment with challenging assignments, international collaboration, and long-term career opportunities for talented professionals.

In order to achieve our common goals, we count on you

• Own and manage the end-to-end billing process, ensuring accurate, timely, and compliant invoicing to customers.
• Oversee the preparation and issuance of invoices and statements, ensuring correctness and adherence to deadlines.
• Maintain up-to-date customer master data and billing-related records.
• Review billable and non-billable items, identify discrepancies, and drive resolution.
• Reconcile billing-related general ledger accounts, ensuring alignment with financial records.
• Collaborate closely with collections, finance/accounting, credit management, and customer acquisition teams.
• Manage customer Purchase Orders (POs), maintain accurate records, and ensure the outbound invoice register is up to date.
• Prepare regular monthly reports on billing performance and outstanding receivables, providing insights to internal stakeholders.
• Support customers and internal stakeholders in resolving billing-related queries, disputes, and complaints.
• Maintain continuous communication with all parties involved in the billing process to ensure smooth and efficient operations.

What you will need for successful work

• Bachelor's degree in IT, Engineering, Business Administration, or a related field.
• Minimum 5 years of professional experience in billing, finance, or a related area.
• Strong understanding of billing processes and financial operations.
• Basic knowledge of collections practices and relevant financial regulations.
• Advanced Microsoft Excel skills.
• Strong analytical thinking and attention to detail, with a structured working approach.
• Ability to manage end-to-end processes and ensure data accuracy and compliance.
• Excellent collaboration and communication skills to work effectively with internal teams and external stakeholders.
• Problem-solving mindset with the ability to handle discrepancies and disputes efficiently.
• Professional working proficiency in English and/or German.

What we offer

• Take over an important and challenging role with high visibility
• Become part of the unique growth stories of Rheinmetall and 4iG, which offer outstanding development and career opportunities
• Gain insight into the defense and automotive industry
• Make use of the broad network with over 40.000 great colleagues at Rheinmetall and 4iG worldwide
• Benefit from various professional trainings and events
• Enjoy our international and flexible work environment with an official office in Budapest but up to 90% mobile work

What we are happy about

• Experience in defense / manufacturing company