WeLab, a leading FinTech group, faces challenges in a highly competitive market due to tightened regulation in the financial technology sector. The company's rapid business expansion led to a surge in data, requiring efficient and stable data processing systems. WeLab replaced its traditional MySQL database with ApsaraDB for MongoDB, leveraging its advanced features such as rich indexing functions and powerful data processing capabilities. This upgrade has improved efficiency by more than 50% and query performance by over 20%, while also reducing stability risks and costs associated with technical support and maintenance. The system upgrade was supported by Alibaba Cloud and MongoDB experts, ensuring a smooth transition and lower operation and learning costs for WeLab.