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Sulzer is a leading engineering company with a proud heritage of innovation. Join our global team to grow your expertise and develop innovative solutions that enable a prosperous and more sustainable society. About the role We are looking for a Billing Administrator to join our team in Madrid (Rivas). This role plays a critical part in ensuring business activities are accurately and efficiently converted into revenue through timely invoicing, contract administration, and customer documentation management. As our rental business continues to grow, the Billing Administrator will support key financial and operational processes that directly impact revenue recognition and customer satisfaction. You will collaborate with multiple stakeholders and contribute to the smooth execution of month-end and year-end closing activities. This is an excellent opportunity for a detail-oriented professional who enjoys working in a dynamic environment and wants to be part of an international organization undergoing continuous transformation and improvement. What you will do: Process customer invoices accurately and on time. Manage administrative activities related to rental contracts. Prepare and maintain customer documentation required for invoicing. Handle journal entries and support routine accounting activities. Collaborate with Sales Force and internal stakeholders on customer administration matters. Support month-end and year-end invoicing closing activities. Coordinate with internal teams to ensure efficient billing processes. Ensure compliance with established invoicing procedures and controls. Maintain accurate records and contribute to continuous process improvement. What you need to succeed: Required: High School Diploma in Administration or a related field. Minimum 2 years of experience in a similar invoicing, billing, accounting administration, or administrative support role. Familiarity with invoicing systems and data entry processes. Strong attention to detail and accuracy. Good organizational and time management skills. Ability to work independently and manage routine tasks effectively. Proficiency in Microsoft Office, particularly Excel. Strong collaboration and communication skills. Preferred: Medium level of English. Experience supporting contract administration or rental business processes. Knowledge of accounting support activities and financial documentation management. What we offer you Permanent contract. Competitive salary and participation in a variable pay system based on personal and financial goals. Meal vouchers. Flexible benefits plan that includes options like health insurance, transportation, or childcare. A great work environment. Real opportunities for professional development within a well-established global company. Being part of a dynamic organization involved in transformation and continuous improvement projects. Location: Madrid (Rivas) Sulzer is an equal opportunity employer. We believe in the strength of a diverse workforce and are committed to offering an inclusive work environment. We are proud to be recognized as a Top Employer 2026 in Brazil, Canada, China, Finland, Germany, Ireland, Mexico, Switzerland, South Africa, the UK and the USA. Sulzer is a leading engineering company with a proud heritage of innovation. By supporting water and energy security, enabling the energy transition and driving the use of circular technologies, we help our customers build a better world. With more than 13’000 employees and 160 world-class production facilities and service centers across the globe, we are a globally diverse team. We value the uniqueness of all our colleagues, and we appreciate the contributions that each of us makes to the company’s success. We prioritize your health and safety and are committed to offering a work environment in which you can thrive. Join our team now to grow your expertise and develop solutions that truly make a difference! Are you interested in other oppportunities at Sulzer? Feel free to introduce yourself to our team 
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Sulzer
Madrid WWS, Spain
Billing Administrator.
CONTRACTENGINEERING
more at Sulzer.
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