Senior Accountant – RTR Integration & Operations Location: San Jose, Costa Rica Join Lonza and play a pivotal role in integrating newly acquired businesses into our global finance operating model. This is a unique opportunity to combine technical accounting expertise with transformation and integration leadership, helping shape scalable, compliant, and efficient finance operations that support the medicines of tomorrow. What you will get: An agile career and dynamic working culture. An inclusive and ethical workplace. Compensation programs that recognize high performance. A variety of benefits dependent on role and location. What you will do: Lead Record-to-Report (RTR) integration activities for newly acquired businesses, ensuring a seamless transition into Lonza’s finance operating model and Capability Centre. Partner with local and global finance teams to assess accounting processes, validate financial data, align controls, and support successful migration and stabilization activities. Manage complex month-end, quarter-end, and year-end close activities, including general ledger accounting, accruals, intercompany transactions, fixed assets, and financial reporting. Review balance sheet reconciliations, investigate accounting issues, and drive timely resolution to maintain the integrity and accuracy of financial records. Support internal and external audits, ensuring compliance with accounting policies, regulatory requirements, and internal control frameworks. Identify opportunities for process standardization, automation, and operational improvements while contributing to finance transformation initiatives and system enhancements. Serve as a subject matter expert for RTR processes, building strong stakeholder relationships and supporting knowledge transfer, onboarding, and capability development across the finance organization. What we are looking for: Experience in Record-to-Report, General Ledger Accounting, Finance Shared Services, or a similar finance environment, with a strong understanding of financial close and reporting processes. Knowledge of accounting standards and control frameworks, including US GAAP, IFRS, internal controls, and audit requirements. Experience supporting finance integration, acquisitions, shared services transitions, finance transformation programs, or large-scale process improvement initiatives. Strong analytical and problem-solving skills, with the ability to investigate complex accounting issues and deliver sustainable solutions. Experience working with SAP strongly preferred or similar ERP systems, combined with advanced Excel and financial data analysis capabilities. Professional accounting qualification such as ACCA, ACA, CIMA, CPA, CMA, or an equivalent certification strongly preferred. Excellent communication and stakeholder management skills, with the ability to collaborate across global teams and provide guidance to less experienced colleagues. About Lonza At Lonza, our people are our greatest strength. With 30+ sites across five continents, our globally connected teams work together every day to manufacture the medicines of tomorrow. Our core values of Collaboration, Accountability, Excellence, Passion and Integrity reflect who we are and how we work together. Everyone’s ideas, big or small, have the potential to improve millions of lives, and that’s the kind of work we want you to be part of. Innovation thrives when people from all backgrounds bring their unique perspectives to the table. At Lonza, we offer equal employment opportunities to all qualified applicants regardless of race, religion, color, national origin, sex, sexual orientation, gender identity, age, disability, veteran status, or any other characteristic protected by law. If you’re ready to help turn our customers’ breakthrough ideas into viable therapies, we look forward to welcoming you on board. Ready to shape the future of life sciences? Apply now. Every day, our teams across the world work together to turn scientific breakthroughs into life-changing medicines that reach up to 100 million patients a year. Lonza is a place where people can make a unique impact, grow their careers and belong. You will feel at home at Lonza if you: Take ownership, step forward, and enjoy meaningful responsibility Love solving problems and thrive in a complex, fast-moving environment Are curious, always looking to learn and improve Work collaboratively, contributing to something bigger than yourself Are motivated to make a difference through work that impacts customers and their patients Why Lonza: We are a place of unique opportunity, where your ideas, expertise and ambition can make a real difference. Here, you will have the freedom to grow, the support to succeed and the chance to contribute to work that matters. We are the makers of the medicines of tomorrow. Join us. Be you. Apply Now www.lonza.com/careers

Senior Accountant – RTR Integration and Operations.

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