The Parts of Your Platform
This is the one most people forget. Once you’ve developed your API and built the app(s) to consume it, you likely have a user base that is going to be emailing in support requests and bug reports. Those requests likely mean you need to look into the data stored on your backend.
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The admin portal is the piece that most developers forget about until after they’ve shipped, but it can also be one of the most important part of your product once you reach a level of success.
The same is true of apps without cloud components. Even if your app is bug-free—and it’s not—you need to build in easy ways to get at the information needed for support.