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Reddit Front End Interview Questions

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Reddit focuses on JavaScript fundamentals and building UIs with HTML + JS. React is not used — prep vanilla JavaScript and HTML.

JavaScript coding questions​

  • Given a list of messages, dedupe them without using an object or a Set.
  • Simple coding round with arrays and filters (20-minute phone-screen portion).
  • Manipulate arrays (onsite coding round).
  • Tech screen: question involving HTML forms — read the form data and construct a JSON object from it.

User interface coding questions​

  • Build a form-related UI (onsite UI coding round).

System design questions​

  • "Talk through" a feed (phone-screen discussion-only, no implementation).
  • Design a quiz-like game app.

Insider tips from the GreatFrontEnd community​

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

21st Apr 2026:

Some insights from my Reddit tech screen: it started with trivia — how would you talk to a junior engineer about something? Why would you use a POST vs GET call, plus a couple of other scenarios. Then the coding portion: given a list of messages, figure out a way to dedupe them without using an object or a Set.

14th May 2025:

You should prepare JavaScript fundamental and building UI problems with html, and JavaScript

20th Feb 2025:

Reddit tech screen: question involving HTML forms and using the form data to construct a JSON object

27th Oct 2024:

I just had Reddit interview.

  • Phone screen - ask some generic questions like GET & POST, XSS, implement feed (just talk about it). 20 mins simple coding with arrays and filters.
  • Onsite coding: manipulating arrays system design: design quiz like game app UI frontend coding: form related
  • Hiring manager round

Reddit focus on communication and collaboration. No reactjs, just prep for JavaScript and html.

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