Being autonomous and working asynchronously is not for everyone.
There are quiet a few projects. Like in almost every successful company, some of them are quiet big and contain some technical debt. So you must like and be ready to balance new shiny features with parallel change and refactoring of old code. The good news is that there won't be a manager or boss stoping you from doing that but encouraging you to do it. If you convince the team that it is time to replace an old library or to refactor into a new pattern, that will be included in the cycle betting. If you prefer not to decide and just execute the plans of the team, that's also fine. The company is not forcing you to do what you don't like. It respects your mood, skills and personality.