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Uber front end interview questions

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Not much is known about Uber's front end interview process.


  • Implement a rate limiter attribute/decoration/annotation on top of an API endpoint. Caps to N requests per minute with a rolling window. Source A and Source B

User interface coding

  • Create a button that when clicked, adds a progress bar onto the page. The progress bar would then fill up in a given amount of time (think 3 to 5 seconds). If you get past the first part, you will be asked to do throttling how many progress bars can be running at once. For example, if the limit is 3 progress bars, and the user clicks on the button 4 times, the fourth progress bar only starts after the very first one finishes. Source
  • Overlapping circles app. Source