OpusFlow transitioned from using Amazon RDS to Neon for managing its Postgres databases to achieve cost-effective and efficient tenant isolation, which is crucial for handling sensitive data for its European customers. Originally a specialized software agency, OpusFlow has evolved into a leading ERP tool for simplifying sustainable energy installations. The move to Neon, a serverless Postgres solution, allows OpusFlow to implement a single tenancy system where each customer has an isolated database within separate Neon projects. This setup reduces operational overhead and costs as each database can scale independently, and the serverless nature eliminates the need for managing servers. Neon’s branching capabilities facilitate efficient development and testing by allowing isolated environments for each feature or bug fix, mirroring OpusFlow's Git workflow. Additionally, OpusFlow leverages a serverless tech stack including TypeScript, Next.js, and AWS Lambda, aligning with their commitment to sustainability by turning off resources when not in use, thus minimizing waste and enhancing flexibility.