Applications & Platforms
Interfaces & APIs
How Other Systems Connect
Hardly any application stands alone. It receives data from an ERP, signs users in through a central account, sends events to an app or to a dashboard that should stay current without a reload.
These transitions decide how expensive the next integration will be. That's why we treat them as a piece of software in their own right, with contracts of their own to honor, and not as a by-product of the application.