DoorDash Front End Interview Questions

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DoorDash's front end loop is fairly consistent across teams. The phone screen is almost always a small fetch + render UI task, the onsite expands that into adding features, and the system design round leans on backend/architecture knowledge as much as frontend.

Interview process

1. Recruiter call.
2. Technical screen (~1 hour). Build a small UI that fetches from an endpoint and displays results. Two reported variants are:
   • Dog API / Reddit puppies endpoint.
   • Product card list.
3. Virtual onsite (4 rounds):
   • Hiring Manager chat — behavioral.
   • System design.
   • Onsite feature round — add a feature to existing code.
   • Domain knowledge — project deep dive with FE / JS / testing / optimization trivia.

Take-home projects are no longer reported in recent loops.

JavaScript coding questions

• Fix a buggy fetch helper: the provided function may look right but doesn't return the promise from fetch(...). You're expected to spot it.

User interface coding questions

• Implement an image slider that fetches images from a given endpoint and displays them. Onsite follow-up: add like / dislike functionality and persistence.
  • Practice question (Free)
• Variant: render a list of product cards from an API.

System design questions

The onsite system design round commonly asks you to design a Slack-like or messaging-style product. The interviewer hands you a partial architecture diagram on Excalidraw (client-side boxes are filled in, an arrow points off to nothing) and you fill in the backend, choosing between REST vs GraphQL, deciding whether a Backend-For-Frontend (BFF) layer makes sense, and justifying caching and data flow.

• Design a chat / messaging application.
  • Read answer (Paid)

Insider tips from the GreatFrontEnd community

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

2nd Nov 2025:

Heads-up on the DoorDash Senior FE (E5) system design round: they give you the client part of the architecture diagram on Excalidraw (frontend boxes plus an arrow pointing to nothing) and you fill in the rest. There's a small library of icons (servers, DBs, etc.) you can drag in. Be ready to justify REST vs GraphQL and whether a Backend-For-Frontend (BFF) layer makes sense. The round leans heavily on backend knowledge — they essentially expect FE engineers to also be full-stack.

17th Oct 2025:

Current DoorDash process: recruiter → technical screen → virtual onsite. The virtual onsite is 4 rounds: hiring manager chat (behavioral), system design, an "onsite feature" round (add a feature to existing code), and a domain knowledge round (project deep dive plus some trivia).

11th Oct 2025:

Just passed the DoorDash phone screen. The trick on the fetch part: the provided dogsApi function looked correct but didn't actually return the result of fetch(...) — you have to spot that and add return so the promise propagates. Spent 5 minutes debugging it thinking I was calling it wrong.

On the React side you don't need any data manipulation, just .map over the JSON result to access the fields you need. The GFE Image Slider question covers what they want — also brush up on responsive CSS.

8th Mar 2024:

DoorDash doesn't have a question pool for FE — it's almost always the same:

1. Phone screen: implement image slider with a given endpoint.
2. Onsite:
   • Update the slider and add like / dislike functionality.
   • System design — try to come up with 2+ alternative architectures.
   • Domain knowledge — brush up on general FE: JavaScript, testing, optimization, etc.
   • HM round — STAR-format behavioral and a bit more domain knowledge.

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