In my experience this all comes down to proper decomposition of services. Don't have large codebases. Break it down into individual services, libraries, etc. Ve

In my experience this all comes down to proper decomposition of services. Don't have large codebases. Break it down into individual services, libraries, etc. Version your APIs. Use proper semantic versioning in your libraries. Most of the trouble I've found has been in changing code that is coupled to a lot of other code. That sucks in every language. It's worse in dynamic languages only because detection is harder and tooling is weaker. Sounds great on paper, I know, and is much harder in practice. But if done correctly then dynamic languages are awesome boosts to productivity.