The position at GroupM involves serving as a Finance subject matter expert for a diverse portfolio of clients. The role requires collaboration in a fast-paced environment to provide financial rigor and strategic insight for business decisions affecting both the client portfolio and Wavemaker. Responsibilities include ensuring proper forecasting, accounting, and recording of client Billings and Revenue in accordance with Wavemaker policies and GAAP. The position also entails leading the development and negotiation of client contracts and compensation agreements, managing global client relationships, and partnering with various departments to ensure accurate financial reporting and issue resolution.