The banking industry is undergoing a shift towards modernizing its technology architecture, driven by the need for real-time transactions and customer demands. Legacy systems are failing to support accelerated modernization, and enterprises are looking to newer technologies that can plug better capabilities into business-critical systems. Gravity9's client was struggling with performance issues in their core banking platform, Temenos 24, backed by Oracle, and offloading frequently accessed data to the Oracle database failed to give the desired edge of performance and scalability. The challenges included managing the offload platform, dealing with a non-relational data model, and migrating business logic code. Gravity9 used a digital decoupling approach to create message-driven microservices on top of the client's data, leveraging MongoDB for better scalability and flexibility. This approach allowed the client to move from the old offload system to MongoDB by building fully scalable microservices for each business domain. The use of MongoDB Atlas delivered efficiency and security in data offloading and met the desired level of performance, resolving scalability issues with on-premises systems.