Last year Walmart acquired the New Jersey based startup Jet to improve their e-commerce platform with new innovations, to compete more successfully in the e-commerce market and to optimize their order fulfillment costs. A core value of the Jet platform is the smart merchant selection. When a customer orders several items at once they usually can be fulfilled from multiple merchants and different warehouses. The goal is to find the merchant and warehouse combination so that the total order cost, including shipment costs and commissions, is as low as possible. Jet developed an innovative solution to find the most attractive combination of merchants. The bigger the shopping cart, the larger the savings that can be generated. We'll explain how only a clever combination of Machine Learning, new algorithms and GPUs at scale in the cloud can address the problem. This allows to unlock new use cases and business applications, which would not be possible with traditional computing resources.