Uber L5a Senior software engineer Depth in Specialization round for backend

The interview was for a Senior Software Engineer position at Uber. The round was focused on depth in specialization for backend development. The interviewer presented a scenario involving an e-commerce platform with three microservices: SellerService, ProductService, and OrderService. The task was to design a seller-side payment system, given that a buyer-side system already exists. The system should handle payments for 10 orders placed by 2 sellers (5 orders each). The interviewer provided information about the payment gateway, including its processing time and fees. The requirements for the system were outlined, prioritizing audit logging, timely payouts, seller payment status visibility, minimizing gateway fees, and preventing payment drops or duplicates. The interviewer also shared the interface of the third-party payment gateway, which included functions for sending checks and wires. This interview experience provides valuable insights into the technical challenges and design considerations involved in building a robust payment system for an e-commerce platform.