DoorDash Software Engineer System Design Interview Questions
Practice 32 real System Design interview questions for Software Engineer roles at DoorDash.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
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"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
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"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Design a Food Rating System
Design a rating and review system for a food delivery marketplace (e.g. DoorDash). Users of the system should be able to: - Rate a food item on a fixe...
Design a resilient bootstrap API
Design a Resilient Bootstrap API When a client app loads, it needs to fetch everything required to render the first screen in a single call. That data...
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 (Dasher's) daily pay. Th...
Design Food Ratings and Driver Payouts
Design the backend for a food-delivery product (think DoorDash-style marketplace). The system has two distinct surfaces that you must address together...
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 resilient dasher payment system
Question Design an end-to-end payment system for DoorDash delivery drivers (Dashers) that computes payouts from order/delivery lifecycle events. The e...
Design a 3-day donation platform
Design: Online Donation Platform for 3-Day Campaigns Context Design an online donation platform optimized for short, 3-day fundraising campaigns. Each...
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 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 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 Real-Time Monitoring System
Design a real-time monitoring system for a large production environment. The system should: - collect time-series metrics such as CPU, memory, request...
Design review system with voting and rewards
Design a Scalable Product Review System with Voting and Rewards 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...
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...
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...
Deep-dive a project architecture
Question Pick one of your recent, non-trivial projects and conduct a deep, end-to-end technical review. This is an open-ended architecture deep-dive: ...
Design a distributed cron job scheduler
Design a distributed cron job scheduler System Design: Distributed Cron Job Scheduler Context You are designing a multi-tenant, internet-scale cron jo...
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...
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 scalable food news feed
Question Design a news-feed feature for a food discovery app (DoorDash-style). The feed lists items showing title, author, short summary, and engageme...