OpenAI
Leading AI research laboratory developing state-of-the-art foundation models like GPT-4.
5 Rounds
~21 Days
Very Hard
The Interview Loop
Recruiter Screen (30 min)
Standard fit check, behavioral questions, and resume overview.
Technical Loop (3-4 Rounds)
Deep dive into domain knowledge, coding, and system design.
Interview Question Bank
Full Stack Engineer
•
Coding
•
medium
Implement an LRU cache with a time-to-live (TTL) feature. If an item expires, it should not be returned, and it should be evicted.
#Data Structures
#Hash Map
#Linked List
Full Stack Engineer
•
Coding
•
medium
Design a function to merge overlapping text highlights in a document. Given an array of intervals [start, end], return an array of non-overlapping intervals.
#Arrays
#Sorting
#Intervals
Full Stack Engineer
•
Coding
•
easy
Given a raw text string representing a conversation, parse it into a structured JSON format of roles (system, user, assistant) and content blocks.
#String Manipulation
#Parsing
#Regex
Full Stack Engineer
•
Coding
•
hard
Implement a simplified Byte Pair Encoding (BPE) token counting algorithm that calculates the number of tokens in a given string based on a provided vocabulary dictionary.
#Strings
#Greedy Algorithms
#NLP
Full Stack Engineer
•
Coding
•
medium
Implement a concurrent task runner in TypeScript that processes an array of async tasks but limits the maximum number of active promises to a given concurrency limit.
#TypeScript
#Promises
#Concurrency
Difficulty Radar
Based on recent AI-sourced data.
Meet Your Interviewers
The "Standard" Interviewer
Senior EngineerFocuses on core competencies, system constraints, and clear communication.
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Think Out Loud
Always explain your thought process before writing code or drawing architecture.