Online presence
You're adding an online/offline/last seen indicator to a contact list. Given that the app might be force quit or lose its connection and never get to announce it's offline, how would you design the way the client reports its own status to the server?
iOS system designShort answerAdvanced
Design a portfolio and watchlist screen where hundreds of symbols change price dozens of …
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iOS system designShort answerExpert
Design the iOS client for a 1:1 chat like WhatsApp. Focus on message ordering, duplicates…
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iOS system designMultiple choiceBasics
A stock app needs a watchlist screen (prices updating several times a second in the foreg…
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iOS system designShort answerIntro
A travel booking app goes list → detail → booking. For each screen, how do you decide whe…
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