How do startup companies add new features to their product while it's live? [closed]
问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago . How do startups like say Feedly, or Buffer make changes to their code, by adding a new feature and at the same time testing it out without breaking things? Is there a framework for sandboxing, does it have to be built in house, or is it just cloning the git repo on a localhost and