Stories feature design
Design Instagram Stories: photos and short videos that vanish after 24 hours, tap left or right to advance, and a seen indicator. Focus on the media loading that makes the next story appear the instant you tap.
ConcurrencyShort answerExpert
You're building an app that applies real-time filters to the camera preview. It has to ho…
#video
CS fundamentals and algorithmsShort answerAdvanced
You've implemented an LRU cache and the interviewer follows up: "Now make each entry expi…
#expiry
NetworkingMultiple choiceAdvanced
You're building a feature that downloads video and audio files (hundreds of MB to GB) for…
#media
SecurityShort answerAdvanced
Your app puts the token the server returned at login into the header of every request. An…
#expiry