OpenAI Software Engineer System Design Interview Questions
Practice 69 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 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 a ChatGPT-like web chat UI
This English summary evaluates a question that assesses front-end–focused system design competencies such as UI architecture, real-time streaming inte...
Design an in-memory database
Design an in-memory database System Design: In-Memory Database Engine (Single-Node Core, Scale-Out Aware) Context Design the core of an in-memory, sin...
Design a Conversational AI Assistant
This question evaluates system design, distributed systems, and real-time inference-serving competencies for building large-scale conversational AI pr...
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 Distributed Crossword Solver
This question evaluates proficiency in constraint-solving algorithms and distributed system architecture, including data representation, efficient sea...
Design a Slack-like real-time messaging system
This question evaluates a candidate's competency in designing scalable, fault-tolerant real-time messaging systems, including message persistence and ...
Design reliable high-volume chatbot system
This question evaluates a candidate's ability to design scalable, highly available, and fault-tolerant backend architectures for stateful chatbot serv...
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 payment system with holds and batching
This question evaluates a candidate's competency in designing reliable, auditable payment workflows, covering authorization holds, batch settlement, i...
Design a payment processing system
This question evaluates system-design competency in building reliable payment workflows, covering distributed transaction handling, idempotent APIs, a...
Design a URL Shortener
This question evaluates system design and distributed systems competencies, including scalability, availability, data modeling, API design, caching, s...
Design a multi-device calendar application
This question evaluates system design competency in scalable backend architecture, data modeling for time-range queries, synchronization and conflict-...
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 a payment system
This question evaluates a candidate's competency in designing secure, reliable payment architectures, covering API design, transaction lifecycle manag...
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 a CI/CD system with stuck-job handling
This question evaluates a candidate's competence in designing fault-tolerant distributed systems, focusing on state management, failure detection, saf...
Design a URL shortening service
This question evaluates a candidate's ability to design scalable, highly available backend services, testing competencies in API design, data modeling...
Design webhook, POI, chat, CI/CD, payments
You are asked to design several large-scale backend systems in a single onsite session. The bar is breadth and judgment under time pressure: for each ...
Design Slack-like multi-tenant global messaging system
This question evaluates a candidate's ability to design large-scale, multi-tenant real-time messaging systems, testing competencies in distributed sys...