OpenAI Interview Questions
Practice 274 real OpenAI interview questions for 2026 — real interview questions drawn from actual interviews with detailed solutions. OpenAI interview questions on this page span Coding & Algorithms, System Design, ML System Design, Machine Learning, and Data Manipulation (SQL/Python) and cover roles like Software Engineer, Machine Learning Engineer, Data Scientist, Android Engineer, and Frontend Engineer. For interview preparation expect a focus on production ML systems, scalable services, numerical correctness, experimental design, and communication: interviewers evaluate architecture decisions, tradeoffs, measurable impact, and the ability to ship robust systems under uncertainty. The loop runs stage-by-stage: a recruiter screen, a technical phone screen (coding or design), a virtual onsite with focused rounds (practical coding, system and ML design, model/debug deep dives, and behavioral/mission-fit), then team match and offer; typical timeline is about 4–8 weeks and difficulty is high. Practical coding leans toward real-world engineering problems rather than pure LeetCode puzzles. Software-engineer themes include consistent-hashing sharding, GPU job scheduling for text-to-video, payment systems with exactly-once semantics, and video orchestration. ML tracks emphasize resumable iterators and checkpoint/restore, streaming-entropy numerical stability, 1-NN implementations and debugging model backprop; data science focuses on churn, free-trial A/B tests, and SQL retention analysis. Use project deep-dives and worked examples when you prep.
"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 Real-Time Chess Service
Design an online chess service that supports real-time, two-player games. Users should be able to create or join a game, make legal moves, and see the...
Explain Your Engineering Ownership
You are on an initial technical screening call for a Software Engineer role. Despite being an early-stage "recruiter" screen, it is unusually technica...
Build a Reliable Streaming Chat UI
You are building a React-based chat interface where assistant responses stream into the UI token by token in real time (the same UX as a typical LLM c...
Design a Payment Processing Service (Merchant to Payment Provider)
This system design question evaluates a candidate's ability to model a distributed payment processing service that coordinates authorization, capture,...
Diagnose Transformer training and inference bugs
Debugging a Transformer That Intermittently Throws Shape/Dtype Errors and Fails to Converge You inherit a Transformer-based sequence model (decoder-on...
Debug and harden trial-assignment Python code
You are given the following simplified Python snippet used to assign users and trigger a 1‑month free trial: """ import random, datetime, requests def...
Assess free-month promotion impact
This question evaluates a data scientist's competency in experimental design, causal inference, metric definition and prioritization, bias identificat...
Infection Spread Simulation with Death Threshold
This question evaluates a candidate's ability to implement grid-based simulation with multi-state cellular automaton logic, testing practical applicat...
Design a Real-Time Online Chess Platform
Design the backend for a globally distributed real-time chess platform supporting moves, spectators, clocks, reconnects, and failover. Define authorit...
Implement Prefix Products and Their Backward Pass
Let x[0..n-1] be a sequence and define inclusive prefix products by y[i] = x[0] x[1] ... * x[i]. Work through the following variants. State how zero...
Debug a transformer training pipeline
Debug a Transformer training pipeline You are handed a PyTorch Transformer encoder–decoder training pipeline that misbehaves. The pipeline includes to...
Implement an Extensible Chatbot App
Implement a ChatApp class that processes user messages and routes them to bot responders. The system must support multiple bot types, and the design m...
Debug a failing ML classifier
Debugging a Churn Prediction Pipeline With Poor Generalization Context You have inherited a binary churn prediction system. The goal is to predict whe...
Design and optimize a RAG system
Scenario You are building a Retrieval-Augmented Generation (RAG) system for question answering over an internal document corpus (engineering wikis, de...
Count Connected Friend Groups
Count Connected Friend Groups You are given an n x n symmetric adjacency matrix. is_connected[i][j] == 1 means person i and person j are directly conn...
Design a multi-tenant CI/CD platform
Question Design a multi-tenant CI/CD system that runs pipelines triggered by Git activity, isolates tenants from one another, and scales to thousands ...
Design IDE Sandbox and Payments
You are asked to discuss two system design prompts. For each one, define the users, functional requirements, non-functional requirements, APIs, core w...
How would you build an image classifier with dirty data?
This question evaluates a candidate's ability to design end-to-end image classification systems and manage noisy image datasets, testing competencies ...
Design a recommendation system end-to-end
Design a Recommendation System End-to-End You are asked to design a large-scale recommendation system that powers a personalized feed — for example, a...
Design an OOD detection system
This question evaluates a candidate's competency in ML system design, specifically out-of-distribution detection, production monitoring, interpretabil...