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 Engineer
•
Technical
•
medium
Describe how you would ensure idempotency in a data pipeline that processes billing events for OpenAI API usage, ensuring no user is double-charged in case of pipeline retries.
#Idempotency
#Data Pipelines
#Transactional Systems
Data Engineer
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Technical
•
hard
How would you design a system to automatically detect and filter out PII (Personally Identifiable Information) from a continuous stream of training data before it hits our secure storage?
#Data Privacy
#PII
#Stream Processing
#Machine Learning
Data Engineer
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Technical
•
medium
Describe your strategy for partitioning a massive Delta Lake table containing daily chat logs to optimize for both point-in-time and user-specific queries.
#Delta Lake
#Partitioning
#Z-Ordering
#Storage Optimization
Data Engineer
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Technical
•
medium
What are the trade-offs between Parquet and JSONL formats for storing LLM training data?
#File Formats
#Parquet
#JSONL
#Compression
Data Engineer
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Technical
•
medium
How would you implement a backfill strategy for a data pipeline that calculates daily active users, if the logic changed and needs to be applied to the last 2 years of data?
#Backfilling
#Airflow
#Idempotency
#ETL
Data Engineer
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Technical
•
hard
How do you handle schema evolution in a streaming data pipeline without breaking downstream consumers?
#Schema Evolution
#Streaming
#Avro
#Protobuf
Data Engineer
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Technical
•
medium
Design an idempotency mechanism for a data pipeline that occasionally fails and retries midway through processing.
#Idempotency
#ETL
#Fault Tolerance
Machine Learning Engineer
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System Design
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medium
Design a distributed data pipeline to ingest, filter, and deduplicate 10 Petabytes of raw web scrape data for LLM pre-training.
#Big Data
#MinHash
#Deduplication
#Distributed Computing
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.