Doordash Software Engineer System Design Interview Questions
Practice the exact questions companies are asking right now.
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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... ...
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...
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...
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.,...
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...
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 ...
Design review system with voting and rewards
Design: Scalable Product Reviews with Voting and Rewards Context You are designing a reviews feature for a large e-commerce marketplace. Customers can...
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...
Design a 3-day online donation system
System Design: 3-day donation campaign Design an online donation system for a 3-day fundraising campaign. Requirements - Users can donate money to a c...
Debug round-robin request router
Round-Robin Request Router with Health and Dynamic Membership You are given a list of backend servers and an incoming stream of requests. Implement a ...
Deep-dive a project architecture
Deep Technical Review of a Recent System Context: You are interviewing for a system design/engineering role. Select one substantial project you worked...
Design a notification system
System Design: Multi-Channel Notification Platform Context Design a multi-tenant notification platform that delivers messages across email, SMS, and m...
Design cron scheduler and reward/review system
System Design: Company-Wide Scheduler Platform and Employee Review & Rewards System You are designing two platforms for a fast-growing, multi-tenant t...
Design payment and delivery services for dasher payouts
System Design: Delivery and Payment Services for Dasher Earnings Context You are designing two services: - Delivery service emits delivery lifecycle e...
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 ...
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...
Design consistent hashing for sharding
Design a Consistent-Hashing Router with Replication You are building a stateless router that maps arbitrary keys (for example, request IDs or cache ke...
Scale the cache to a distributed system
Design: Scale a Single-Node LRU Cache to a Distributed Cache Assume you are upgrading a single-node, in-memory LRU cache to a distributed cache to sup...
Design consistent hashing with a sorted map
Consistent Hashing with a Sorted Map (Virtual Nodes) Context You are building a client-side library to map arbitrary keys to backend nodes (cache/stor...