A critical migration for us was moving our initial backend prototype from Supabase to a self-managed Java Spring Boot application. While Supabase's Backend-as-a-Service (BaaS) model was excellent for rapidly building our MVP with its auto-generated APIs, we required more granular control over our business logic and data persistence layer as we prepared to scale. The migration involved carefully moving our user data to a dedicated PostgreSQL instance and rewriting our RESTful APIs in Spring Boot. This move gave us full control over our architecture, allowing us to implement more complex JWT authentication flows using Spring Security and optimize database performance for our demanding Fintech workload.