[JKCalhoun]

Ideally you have a product you worked on on the App Store or equivalent. Excellent if you have some of the code with you (to the degree you are allowed to).

Both of these things lead to natural points of conversations with your interviewer.

"Have any problems with concurrency with you approach?"

"Any user feedback that caused you to make changes to the app?"

etc....

[hnfong]

A portfolio of shipped code might work for Apple but most other FAANGs probably gravitate towards standard programming puzzles.