The Customer Success Manager (CSM) at IBM's Apptio division is responsible for managing a portfolio of large, complex customers, ensuring successful adoption and usage of Apptio applications. This role requires a blend of customer-facing experience, technical knowledge, and the ability to collaborate with various stakeholders to drive customer success and satisfaction. The CSM will act as a trusted advisor, coach customers on best practices, and coordinate with internal teams to deliver high-quality solutions and support.