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Reddit Front End Interview Questions

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Explore round details, preparation advice, and related practice in GreatFrontEnd's Reddit Front End Interview Guide.

Reddit interviews have included both vanilla JavaScript and React. Earlier experiences centered on HTML forms and array operations; an August 2026 loop added React timers, graph construction, and trivia-app design. Prepare the browser fundamentals and confirm the framework for your own rounds.

JavaScript coding questions​

  • Deduplicate a list of messages without using an object or a Set.
  • Manipulate arrays with filtering and other transformations.
  • Read HTML form data and construct a JSON object.
  • Explain web concepts, including GET versus POST, as if discussing them with a junior engineer.

Deduplication practice can start with Unique Array. Its base exercise does not impose the interview's object/Set restriction; repeat it under that constraint and discuss the time and space costs.

User interface coding questions​

  • Build a form-related interface using HTML and JavaScript.
  • Use React with setInterval and setTimeout to animate or visualize data.

The elapsed-time state in Stopwatch provides related timer practice. Animation or data visualization would be an extension, rather than part of the base stopwatch exercise. Check cleanup when the component unmounts and when an interaction restarts.

Algorithm questions​

  • Construct a graph from input data, then traverse it in a second part of the task.

Clarify how records become nodes and edges before choosing breadth-first or depth-first traversal. Check disconnected nodes and cycles.

System design questions​

  • Talk through a feed without implementing it.
    • A related worked design is News Feed (Free).
  • Design a quiz or trivia application, discussing client architecture, APIs, and performance.

Insider tips from the GreatFrontEnd community​

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

April 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.

May 2025:

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

February 2025:

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

October 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.

For more insider tips, visit GreatFrontEnd!

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