Before starting work on the actual app, we designed a user interface in Sketch, iterating until the final design. We built the app entirely in Apple's Swift, a cutting edge modern programming language. We encountered roadblocks throughout the process, and had to tweak the notification system slightly away from what our target was, but it works beautifully and uses Google's Firebase platform to host the app.
HHSchedule has become a hit with students, some of them even saying it's saved their lives this semester (a bit dramatic, but we'll take it). Even faculty have found a use case for the app. Even months after launch, 84% of the student body uses the app on a daily basis.