OpenAI Software Engineer System Design Interview Questions
Practice 56 real System Design interview questions for Software Engineer roles at OpenAI.
"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 a URL shortening service
Design a scalable backend service for shortening URLs (similar to popular URL shortener products). Describe a system that supports at least the follow...
Design a team chat system
Design a team chat system similar to Slack. The system should support: - One-to-one direct messages - One-to-many or group conversations (channels or ...
Design a multi-device calendar application
System design prompt Design a calendar application similar to Apple Calendar. Core features - Users can create, update, and delete events. - The UI mu...
Design a multi-tenant Slack-like messenger
System Design: Multi‑Tenant B2B Team Messaging (Slack‑like) Design a multi‑tenant, enterprise‑grade team messaging platform similar to Slack. Function...
Design an in-memory key-value database
Design an in-memory key-value database Design an In-Memory Key–Value Database (Technical Screen) Context Build an in-memory key–value (KV) database th...
Design a URL Shortener
Design a URL shortening service similar to Bitly. The system should: - Accept a long URL and generate a short, unique alias. - Redirect users from the...
Design credit balance with vector-clock expirations
Credit Balance Service with Vector-Clock Expiries You are designing a backend service that maintains per-user promotional credits. Credits are granted...
Design Slack-like messaging platform
Design a Slack-like team collaboration product. Core features: - Workspaces (tenants), users, and channels (public/private) - Direct messages (1:1 and...
Design an online ads serving system
System Design: Low-Latency Targeted Ad Serving (≤100 ms E2E) You are designing an online advertising serving system for web/app inventory with a stric...
Design reliable high-volume chatbot system
You are designing the backend for a chatbot / AI assistant service (similar to a support bot or meeting assistant). Many users may send messages at th...
Design a Payment System
Design a Payment System Design the backend payment system for an online platform that charges customers for goods and services (for example, a marketp...
Design a distributed crossword solving service
You are asked to design a backend service that can solve crossword puzzles at scale. A single puzzle instance consists of: - A crossword board (grid) ...
Design a minimal ChatGPT with presets
System Design: Minimal ChatGPT-like Service With Reusable Presets Context Design a multi-tenant conversational AI service that supports reusable prese...
Design a GPT chat UI with snapshots and sharing
System Design: End-to-End Web App for Interacting with a GPT-like Model Context You are designing a multi-tenant, browser-based SaaS application that ...
Design a fullstack app with frontend focus
Design a fullstack app with frontend focus Design a Full‑Stack Web Application (Frontend Emphasis) Context You are given a 2–3 page requirements docum...
Design an online real-time chess game
Design an online real-time chess service, similar to chess.com. Users should be able to sign in, use matchmaking, play real-time games, make moves wit...