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Uber front end interview questions

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Front End Interview Handbook is now part of GreatFrontEnd! We are working to migrate the content over and you may find the latest version of this page on GreatFrontEnd.

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