OpenAI Interview Questions
Master your tech interview with our curated database of real questions from top companies.
Implement in-memory DB querying
Question Implement an in-memory database that supports: 1. Querying the whole table and returning only selected columns (projection). 2. Adding WHERE ...
Analyze A/B Test Results for Subscription Conversion Rates
A/B Test: Free-Trial Offer Impact on Paid Subscriptions and Churn Context You are analyzing an A/B test where free users in the Treatment arm are offe...
Design Schema for Accurate Subscription State Tracking
subscription_events +----------+---------------------+-----------+-----------+ | user_id | event_ts | event_type| plan_type | +----------+...
Design Schema and Logic for Subscription Event Tracking
user_subscription_events +----------+-------------+---------------------+-----------+---------+ | user_id | event_type | event_time | plan_...
Determine Metrics to Measure Free-Trial Impact on Subscriptions
A/B Test: Free Trial Offer Impact on Subscription Behavior Scenario You are analyzing a randomized A/B test in which free users are offered a free tri...
Identify Bugs in Python Script for User Assignment
Scenario A simple Python script assigns users to experiment groups and triggers the free-trial offer. Question Inspect the script and list any bugs or...
Design GPU credit allocator
System Design: GPU Credits Allocation and Fair Usage Context You are designing a multi-tenant platform that provides access to GPU compute across many...
Design in-memory database API
In-Memory Database: Insert, Query, and Indexing Context You are to design a minimal, single-process, in-memory database to be embedded in a service. T...
Find earliest supporting version under constraints
You are given version strings formatted as {major}.{minor}.{patch}, e.g., "103.003.03". Each version either supports a feature or not. You may call is...
Design a Retrieval-Augmented Generation (RAG) system
Prompt Design a Retrieval-Augmented Generation (RAG) system that answers user questions using an organization’s internal documents (PDFs, wiki pages, ...
Implement an in-memory SQL-like table
Problem Implement a simple in-memory database for one table. All values are strings. Each row is identified by a rowKey (string). Each row contains co...
Design a chatbot fallback for unknown questions
Scenario You run a ChatGPT-like assistant. Users sometimes ask questions the model cannot answer reliably (unknown/uncertain/needs up-to-date facts). ...
Design a search query autocomplete system
Question Design a search autocomplete system that suggests completions as the user types. Requirements - Sub-100ms latency per keystroke. - Suggestion...
Design a regional surge pricing strategy
Scenario You operate a ride-hailing platform. You need to design a system that sets surge multipliers (dynamic pricing) for a given region. Task Desig...
Design a CI/CD system with stuck-job handling
Scenario Design a CI/CD platform similar to GitHub Actions/Jenkins that: - Triggers pipelines on events (e.g., push/PR/merge). - Runs pipelines as a D...
Explain what torch.distributed.barrier does
Question In PyTorch distributed training, what does torch.distributed.barrier() do? Follow-ups - Give an example of when you would use it. - What are ...
Select high-quality math documents from crawls
Scenario You have a web crawler that collects raw HTML/PDF documents. You want to build a pipeline that identifies high-quality math documents suitabl...
Design a payment processing system
Scenario Design a backend payment system for an online product that supports: - One-time charges and refunds. - Idempotent payment APIs (clients may r...
Implement credit ledger with out-of-order timestamps
Problem You are implementing a GPU credit ledger that supports adding credits, charging credits, and querying balances. Requests can arrive in any tim...
Design a CI/CD system with live log streaming
System Design Prompt: CI/CD Platform (shell-script jobs) Design a CI/CD system that can: 1. Allow users to define pipelines consisting of multiple job...