Doordash Interview Questions
Practice the exact questions companies are asking right now.
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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...
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... ...
Count changed nodes between two menu trees
You maintain a merchant menu as a rooted tree. Each node represents a menu item/category and has: - key (string, unique among siblings) - value (integ...
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...
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...
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...
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...
Compute cart total with best promotion
Assume you are implementing a checkout price calculator for an online shopping cart. You are given: - A list of items in the cart. Each item has: - ...
Design a donations service with 3-day rolling totals
Design a service that ingests donations and serves rolling 3-day donation totals. Requirements Core features 1. Ingest donation events: - Each dona...
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 ...
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 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 ...
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_...
Debug round-robin, DashMap, and simple cache
You are given a service that routes requests to a list of nodes, each marked as either available or unavailable. The pickNode() function is intended t...
Design API that aggregates three downstream APIs
You are given three existing HTTP JSON APIs owned by other backend services: - Service A: GET /service-a?user_id={id} → returns basic user profile dat...
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 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...
Design a resilient dasher payment system
System Design: End-to-End Payouts from Order Lifecycle Events You are designing a system that computes delivery driver (Dasher) payouts from an event ...
How would you test a bike delivery option?
Case: Launch a bike-delivery option You work on a food delivery marketplace (customers place orders; couriers deliver). The team is considering launch...
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...