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
Data Scientist
•
Coding
•
hard
Given a stream of incoming API requests represented as tuples of (timestamp, user_id, token_count), write a Python algorithm to identify users who are consistently hitting the 99th percentile of token usage within any rolling 5-minute window.
#Streaming Data
#Sliding Window
#Heaps/Queues
Data Scientist
•
Coding
•
medium
Given a list of user sessions containing timestamps and generated token counts, write an algorithm in Python to classify sessions as 'bot/scraper' vs. 'human' based on generation cadence and prompt frequency.
#Anomaly Detection
#Time Series
#Python
Data Scientist
•
Coding
•
medium
Write a Python function to parse a massive JSONL file of ChatGPT conversation logs (too large to fit in memory) and compute the rolling 7-day average of messages per session.
#Data Generators
#Memory Management
#Time Series
Data Scientist
•
Coding
•
hard
Implement a stratified sampling algorithm in Python to select prompt-response pairs for human evaluation (RLHF), ensuring proportional representation across 50 languages and 20 topic categories.
#Sampling
#Probability
#Data Structures
Difficulty Radar
Based on recent AI-sourced data.
Meet Your Interviewers
The "Standard" Interviewer
Senior EngineerFocuses on core competencies, system constraints, and clear communication.
SimulateUnwritten Rules
Think Out Loud
Always explain your thought process before writing code or drawing architecture.