DoorDash Software Engineer System Design Interview Questions
Practice 37 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"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"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."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"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 consistent hashing with a sorted map
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...
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: ...
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 Real-Time Monitoring System
This question evaluates a candidate's system design and distributed-systems competencies, focusing on scalable time-series ingestion, storage, query, ...
Design a scalable Instagram-like platform
Design a scalable Instagram-like platform Design: Instagram-like Photo/Video Sharing Platform (Technical Screen) Context Design a photo/video sharing ...
Build an API aggregator with concurrency and retries
Build an API aggregator with concurrency and retries Build an Aggregation Service with Parallel Calls, Timeouts, Retries, and Observability Context Yo...
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 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...
Design a donation service for a 3‑day charity
This question evaluates a candidate's system design skills around building a reliable, scalable online donation service, emphasizing competencies in p...
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 limited-time donation platform
Design limited-time donation platform System Design: Donations Platform for a Three-Day Global Fundraising Campaign Context You are to design an inter...
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 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 3-day online donation system
This question evaluates a candidate's ability in large-scale web system design, focusing on reliable payment integration, idempotency and consistency ...
Design notification and project architecture
Design notification and project architecture System Design: Multi-Channel Notification Platform Design a scalable Notification System that supports re...
Design a service aggregator with robust error handling
Design a service aggregator with robust error handling System Design: HTTP Aggregator With Deadlines, Resilience, and Observability Context Build an H...
Design donation database and failure handling
System Design: Donations Platform with One-Time and Recurring Payments Context Design a backend for a donations platform that supports campaigns, one-...
Design an async donation payment platform
System Design: Online Donation Platform for a 3-Day Campaign Context You are designing a donation platform for a time-bounded, high-traffic, three-day...