Frontend apps often look “fine” when everything underneath is on fire. UIs mask half-failed requests, optimistic updates hide backend problems, and async flows drift into states no one designed. The result? Confusing bugs, broken expectations, and a flood of support tickets that no one can reproduce.

This talk digs into the real hidden failure modes of modern web apps: race conditions, phantom optimistic states, cache desync, ambiguous error handling, and the “looks correct, behaves wrong” category every developer knows too well. We’ll explore how to design UI contracts that stay truthful under stress, how to detect failures the UI hides, and how to structure your frontend so it doesn’t create its own reality.

You’ll leave with patterns to make your frontend more predictable, more honest, and a lot easier to debug.