Described is a method in a cloud-based system for implementing changes to flow engine software that executes user-specific flows for a plurality of users. The method includes: receiving a request to load and execute a user-specific flow; identifying an API version identifier for the user-specific flow; loading the user-specific flow; determining whether a software change to the flow engine software should be applied when executing the user-specific flow based on the API version identifier; and executing the user-specific flow using the flow engine software with the software change when it is determined, based on the API version identifier, that the software change to the flow engine software should be applied.