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X/Twitter Front End Interview Questions

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JavaScript coding questions​

  • 2D-array variants (Karat first-round technical screen). The reported question was a snake-game-style problem on a 2D grid, followed by a harder variant (medium/hard) on the same array shape. Interviewers keep asking new variants if you finish — pace yourself.

User interface coding questions​

  • Implement a typeahead. Source
  • Add features to a tic-tac-toe game.
  • Build a Twitter feed as a progressive UI coding question:
    • Level 1: Show posts using hardcoded data (JSX for each post is given).
    • Level 2: Add a new post.
    • Level 3: Fetch post details via API; also fetch the author of each post — if the author is the user themselves, display "You" instead of their name.
    • Level 4: Show a likes count. Liking should increment the count and the feed should sort by likes.

System design questions​

  • Open-ended system design — actual system design, not just frontend-focused. Watch walkthroughs of designing Netflix, Twitter, Facebook, etc.
  • "Logical & Maintainable" round: an interviewer asks a simple question and iterates on top of it to see how you write maintainable code. Don't over-abstract — they care that you abstract only with reason.

Quiz questions​

  • What is the difference between Array.prototype.map and Array.prototype.forEach?

Source: Glassdoor Twitter Front End Developer Interview Questions

Insider tips from the GreatFrontEnd community​

These tips were shared by GreatFrontEnd users who have completed interviews with Twitter.

5th Sep 2025:

Got asked to "Design Twitter feed" as a progressive UI coding question. The levels were:

  1. Show posts using hardcoded data; JSX was provided for the post.
  2. Add a new post.
  3. Fetch post details via API; also fetch the author of each post — if the author is the user themselves, display "You" instead of the name.
  4. Show the likes count. Liking should increment the count, and the feed should sort by likes. There was one more case I don't remember.

5th Jan 2025:

Study for tic tac toe and autocomplete questions

6th Nov 2024:

I had one last month for their product web engineer role. They don't have recruiters at xai. It's the engineers in the team that filter resumes, call candidates.The first round was a short 15 mnts google meets call, the engineer went over what they are building - they are basically upgrading a legacy app built by twitter engineers years ago into react and looking for someone who has both react as well as react native skills. Received a rejection after the initial chat.

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