Doordash Interview Questions
Practice 253 real interview questions from Doordash. Covers Analytics & Experimentation, Coding & Algorithms, System Design, Behavioral & Leadership. For roles including Software Engineer, Data Scientist, Machine Learning Engineer, Analytics Engineer.
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Calculate Order Request Metrics
You are working with DoorDash order and delivery-request data. Write SQL to answer the questions below. Tables: 1. orders - order_id BIGINT, primary k...
Evaluate Biker Feature Success
DoorDash is considering launching a Biker Mode feature for Dashers who deliver by bicycle. The feature may help bicycle Dashers identify suitable shor...
Design a resilient bootstrap API
You are given three internal services (or internal APIs): 1) User Service: GET /user-to-consumer?user_id=... → returns { consumer_id, user_profile... ...
Compute Nearest Destination Distances
You are given an m x n grid representing a city map. Each cell contains one of the following characters: - D: a destination - X: an obstacle - .: an o...
Compute Courier Delivery Pay
A delivery platform has a service that can return all orders delivered by a courier. You are given: - courierId: the courier's identifier. - ratePerMi...
Design Real-Time Driver Pay Aggregation
Design a production system that ingests a high-volume stream of delivery-order events and continuously computes each driver's daily pay. The system sh...
Design Food Ratings and Driver Payouts
Design the backend for a food-delivery product with the following requirements: - Each food item has a detail page that shows an aggregated rating on ...
How to test bike delivery?
You are a data scientist at a food-delivery marketplace. The company is considering launching a bicycle courier delivery option in selected cities. De...
How to prepare for AI-assisted coding interviews?
Scenario You’re invited to an onsite interview labeled “AI Code Craft Challenge”. - You will receive starter code (an existing small codebase). - You ...
How would you test product changes?
You are interviewing for a Product Data Scientist role at a food-delivery marketplace. Answer the following related experimentation cases: 1. Checkout...
Design an alert notification system
Design a multi-tenant alert notification system for operational incidents. Monitoring sources send events when checks fire or recover. Users can confi...
Calculate Daily Driver Pay
You are given a one-day event log for a delivery driver. Each input record is a JSON event with fields such as order_id, event_type, timestamp, and ba...
Select the best dasher for an order
You need to assign an order to a dasher. Input: - An order with a pickup location (x, y). - A list of dashers, each with: - id - current location ...
Design personalized restaurant search and recommendations
Scenario You are designing a DoorDash-like personalized restaurant recommendation system. A user types a free-text query (e.g., “spicy ramen under $20...
Design experiments for marketplace product changes
You are interviewing for a Data Scientist role at a food-delivery marketplace such as DoorDash. For each scenario below, explain how you would evaluat...
Evaluate a new ranking model
A food-delivery company currently serves homepage store recommendations with ranking model V1.1. A new model V2.0 adds several new features and may re...
Analyze Restaurant Customer Metrics
You are given two tables for a food delivery platform. orders( - order_id BIGINT - customer_id BIGINT - restaurant_id BIGINT - order_ts TIMESTAMP - or...
Compute dasher pay from order event logs
You are given a list of delivery-order event records for a single dasher. Each record contains: - order_id - event_type in {CREATED, ACCEPTED, PICKED_...
Handle payment-service outages
You own a service that computes courier payouts and then submits payout requests to a downstream payment processor. What should your system do if the ...
Minimize batches and allocate riders by time
Coding prompts (same interview round) 1) Minimum number of batches for time points You are given a list of event time points (integers), e.g. [1, 3, 5...