DoorDash Interview Questions
Practice 254 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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Design DoorDash Marketplace Experiments
You are interviewing for a Data Scientist role at a food-delivery marketplace such as DoorDash. The marketplace has three sides: customers, restaurant...
Design a donation service for a 3‑day charity
System Design Prompt You are designing an online donation service for a 3-day charity campaign. Requirements - Donors can: - Select a charity campai...
How would you diagnose a completed orders drop?
Case: Completed orders dropped in Los Angeles You are a Data Scientist supporting a consumer pricing team for a two-sided delivery marketplace (custom...
Design a multi-channel notification system
Design a notification system that receives alert events from other internal systems and notifies all subscribed users through multiple channels (e.g.,...
Build Resilient Aggregation and Debug Routing
This onsite combined two software-engineering exercises: 1. Implement a service method that calls multiple mock downstream APIs, merges their response...
Describe a Project End-to-End
Walk through one project you worked on in depth. Explain the business problem, your specific role, the technical approach, the main trade-offs, and ho...
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 ...
Debug and harden a driver-selection component
Debugging Exercise: “Pick Dasher” You are given a small codebase for selecting a dasher (driver) using a heap/priority-queue–like structure. The curre...
Design a Customer Review Page
Design the customer review page for a large marketplace or local-services platform. The page should support: - Aggregate ratings, such as average scor...
Investigate High Memory Usage
You are the on-call engineer for a delivery platform. System context - Couriers use a mobile app to accept and complete deliveries. - The mobile app c...
Compute courier pay and implement load balancing
Problem 1: Compute courier (delivery driver) pay You are given a sequence of delivery-related events for a courier during a day. Your task is to compu...
Investigate LA successful orders drop
You are a Product/Data Scientist at DoorDash. A key metric “of successful orders per day” in Los Angeles (LA) has dropped noticeably over the last few...
Design a Homepage Store Recommender
You are designing the homepage store recommendation system for a food-delivery app similar to DoorDash. When a user opens the app, the online request ...
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...
Protect SLA and Choose Storage
You own a service that calculates delivery-order payments from order lifecycle events. Discuss two design questions: 1. If an upstream dependency sudd...
Write SQL for percent and window changes
Use PostgreSQL. Assume today = 2025-09-01. You must use CTEs and multiple window functions. Schema and tiny samples are below. Schema: - exposures(uni...
Investigate LA Completed Orders Decline
You are a data scientist supporting DoorDash's consumer pricing team. Leadership notices that completed orders in Los Angeles have declined materially...
Design and analyze a switchback experiment
Switchback Experiment Design: Reducing Cold-Food Incidents for Bike Couriers You are optimizing a delivery marketplace feature suspected to reduce col...
Design a 3-day donation platform
Design: Online Donation Platform for 3‑Day Campaigns Context You are designing an online donation platform optimized for short, 3‑day fundraising camp...
How do you discuss mistakes and trade-offs?
Be prepared for both of the following prompts: 1. Tell me about a major mistake you made as a software engineer. Explain the situation, the impact,...