Company
OpenAI interview questions
342 practice questions in the style of OpenAI's interviews, covering Behavioral & Leadership, Coding & Algorithms, Analytics & Experimentation, Software Engineering Fundamentals, Machine Learning, Data Manipulation (SQL/Python), Statistics & Math, System Design, ML System Design, Product Design & Strategy.
7 easy181 medium154 hard
OpenAI interview questions by the numbers
Last updated
Katkat has 342 OpenAI interview questions. The largest topics are System Design (32%), Coding & Algorithms (23%) and Software Engineering Fundamentals (18%). By difficulty: 2% easy, 53% medium and 45% hard. The most common round is Technical Screen (57%). Frequent concepts include System Design, Distributed Systems, Scalability and Data Structures.
Topics
- System Design32% · 108
- Coding & Algorithms23% · 79
- Machine Learning9% · 32
- ML System Design7% · 24
- Behavioral & Leadership5% · 17
Difficulty
- Easy2% · 7
- Medium53% · 181
- Hard45% · 154
Interview rounds
- Technical Screen57% · 196
- Onsite37% · 127
- HR Screen4% · 12
- Online Assessment2% · 7
Roles
- Software Engineer71% · 242
- Machine Learning Engineer21% · 73
- Data Scientist5% · 18
- Android Engineer1% · 3
- Product Manager1% · 2
Frequent concepts
- System Design15% · 53
- Distributed Systems13% · 44
- Scalability5% · 18
- Data Structures4% · 14
- Concurrency3% · 11
- system-design3% · 11
Most mentioned in interview experiences
- 1.Plant Infection Grid Simulation: Days to Stabilize, Immune Plants, Expiring Immunity5 reports
- 2.Simulate Plant Infection With Controlled Burning4 reports
- 3.Implement a memory allocator with malloc/free3 reports
- 4.Debug a Concurrent Job Scheduler2 reports
- 5.Design a Payment System That Charges Customers Through an External Payment Provider2 reports
- 6.Design a Sora-Style Video Generation Service with Fair Queueing and Cancellation2 reports
- 7.Design an Online Devbox Service for On-Demand Cloud Development Environments2 reports
- 8.Expiring GPU Credit Ledger with Out-of-Order Events and Point-in-Time Balance2 reports
- 9.Fault-Tolerant Task Queue with Retries, a Dead-Letter Queue and Task Dependencies2 reports
- 10.Fault-Tolerant Task Queue with Retry Cooldowns, a Dead-Letter Queue and Dependencies2 reports
Counted from 46 candidate interview experiences on Katkat. How we collect and count
Showing 271–300 of 342 results
This question evaluates understanding of data structures and algorithmic complexity in the context of designing a key-value in-memory database, and it falls under the Coding & Algorithms domain for a Machine Learning Engineer role while focusing on practical implementation skills.
OpenAIMachine Learning EngineerCoding & AlgorithmsOnsiteImplement malloc and free for a fixed range of memory in Python, first with a simple list of blocks and then with logarithmic-time operations backed by a third-party sorted container. It tests block splitting and merging, choosing ordered indexes for allocation and neighbor lookup, and keeping parallel structures consistent.
OpenAISoftware EngineerSoftware Engineering FundamentalsTechnical ScreenThis question evaluates skills in distributed systems and algorithms, including reliable message-passing between adjacent nodes, graph traversal and path discovery, fault-tolerant protocol design, and message/time complexity analysis.
OpenAISoftware EngineerCoding & AlgorithmsTechnical ScreenThis question evaluates competency in implementing an in-memory key-value store with persistence, covering concepts such as serialization, durability, data structure management, and basic I/O handling.
OpenAISoftware EngineerCoding & AlgorithmsTechnical ScreenThis problem tests your ability to design a recursive data structure for an abstract syntax tree and implement a unification-based type inference engine for a simple functional language.
OpenAISoftware EngineerCoding & AlgorithmsTechnical ScreenThis question evaluates proficiency in vectorized numerical computing with NumPy, understanding of broadcasting semantics, and awareness of numerical stability and algorithmic time/space complexity when manipulating high-dimensional arrays.
OpenAIMachine Learning EngineerData Manipulation (SQL/Python)OnsiteThis question evaluates a candidate's ability to handle label noise by estimating annotator reliability and applying data-cleaning, relabeling, or reweighting methods while measuring model performance and understanding classification metrics.
OpenAIMachine Learning EngineerMachine LearningOnsiteThis question evaluates a candidate's ability to analyze noisy multi-annotator labels, design label-aggregation and dataset-splitting strategies, and choose modeling and evaluation approaches for binary text classification.
OpenAIMachine Learning EngineerMachine LearningTechnical ScreenImplement an in-memory key-value store, make it recover from a log file after a crash, including a half-written final record, and make it correct and fast under many concurrent threads. It tests write-ahead logging, crash consistency, compaction, and lock design with group commit.
OpenAISoftware EngineerSoftware Engineering FundamentalsOnsiteImplement an indexed dynamic sequence of strings, in the sense of an array list, that supports inserting at a position and reading by position. Starting from a plain singly linked list, build a linked list with a checkpoint every k nodes so reads cost O(k), and keep the checkpoints correct as insertions shift positions.
OpenAISoftware EngineerSoftware Engineering FundamentalsOnsiteImplement a cellular automaton simulating epidemic spread on a 2D grid with simultaneous infection and mortality transitions until convergence.
OpenAISoftware EngineerCoding & AlgorithmsTechnical ScreenImplement a toy type-inference engine that unifies generic parameter types with concrete argument types and substitutes resolved type variables to determine the return type.
OpenAIMachine Learning EngineerCoding & AlgorithmsOnsiteA three-part key-value store exercise: serialize keys, values and their lengths into bytes and persist them on shutdown, split the saved data into chunks of a given maximum size, and discuss making the existing code safe for multithreaded use. It tests byte-level encoding, correct restore and concurrency reasoning.
OpenAISoftware EngineerSoftware Engineering FundamentalsTechnical ScreenImplement an in-memory job dispatcher where failed jobs wait out a per-job backoff, keep their original queue position, and get quarantined after repeated failures, then add prerequisite jobs with cascading quarantine. Tests state modeling, dual-heap scheduling, and online topological ordering.
OpenAISoftware EngineerSoftware Engineering FundamentalsTechnical ScreenThis question evaluates your ability to provide engineering leadership through severe technical uncertainty, resolve architectural or project disagreements constructively, and deliver measurable impact under high expectations.
OpenAISoftware EngineerBehavioral & LeadershipHR ScreenBuild an in-process job queue that hands out time-limited leases. A job is never lost when a worker crashes, hangs or fails, and jobs that always fail are dead-lettered after a retry limit. Tests state machines, fencing tokens, thread safety and clock-injected tests.
OpenAISoftware EngineerSoftware Engineering FundamentalsTechnical ScreenSimulate a memory allocator over n units: each allocation takes the leftmost run of consecutive free units for an owner, and each free releases all of that owner's units. Return the result of every operation. It tests interval bookkeeping and logarithmic-time search for free runs at up to 100,000 operations.
OpenAISoftware EngineerCoding & AlgorithmsOnsiteSimulate booking a single theater row of n seats, where each booking takes the leftmost block of consecutive free seats for a group and a cancellation releases every seat that group currently holds anywhere in the row. Tests augmented-interval bookkeeping and logarithmic-time search for the best free run.
OpenAISoftware EngineerCoding & AlgorithmsOnsiteMaintain empirical Shannon entropy after every categorical observation without rescanning all categories. The discussion should cover arbitrary identifiers, first-item behavior, exact counts, floating-point drift, concurrency, deletions, sliding windows, and merging summaries from separate stream partitions.
OpenAIMachine Learning EngineerStatistics & MathOnsiteThis question evaluates data-structure design and algorithmic reasoning for time-based resource accounting, including handling expiring credits and out-of-order operations while maintaining efficient (logarithmic) performance constraints.
OpenAISoftware EngineerCoding & AlgorithmsTechnical ScreenThis question tests the ability to design an experiment for a subscription product, focusing on causal inference, handling right-censoring in cohort data, and calculating the Return on Investment (ROI) for a promotional offer.
OpenAIData ScientistAnalytics & ExperimentationTechnical ScreenThis question evaluates algorithmic problem-solving skills focused on interval manipulation, sorting and merging logic, and time/space complexity analysis within the Coding & Algorithms domain, emphasizing practical application.
OpenAISoftware EngineerCoding & AlgorithmsTechnical ScreenSimulate a row of microorganisms in which each one may eat a strictly smaller neighbor from a different family, with rounds resolved from left to right, and report the family and size of the largest survivor at equilibrium. It tests precise rule-following, list mutation during iteration, and careful per-round bookkeeping.
OpenAISoftware EngineerCoding & AlgorithmsOnline AssessmentThis problem tests your ability to simulate a state-based grid propagation and optimize intervention timing using either greedy or dynamic programming approaches.
OpenAISoftware EngineerCoding & AlgorithmsTechnical ScreenDesign and implement a discrete grid simulation modeling a five-stage disease progression with state countdowns, immunity, delayed mortality, and external burn interventions.
OpenAIMachine Learning EngineerSoftware Engineering FundamentalsTechnical ScreenThis question evaluates geometric reasoning and probability theory skills, specifically transformation of random variables and derivation of CDF/PDF from angular sampling, together with practical competence in Monte Carlo simulation and interpretation of numerical and visualization artifacts; domain: Software Engineering Fundamentals.
OpenAISoftware EngineerSoftware Engineering FundamentalsOnsiteDesign an edge-to-cloud device monitoring system that accurately tracks device health and liveness across flaky, high-latency networks without falsely reporting absolute state.
OpenAISoftware EngineerSystem DesignOnsiteThis question evaluates a developer's skills in C++ performance engineering and concurrent systems, covering profiling, bottleneck identification (e.g., cache locality and lock contention), and code-level performance reasoning to improve throughput and latency.
OpenAISoftware EngineerCoding & AlgorithmsTechnical ScreenReturn a deterministic, lexicographically smallest valid ordering of named prep steps with dependency constraints, correctly including steps with no prerequisites and steps unconnected to any dependency.
OpenAISoftware EngineerCoding & AlgorithmsTechnical ScreenTests deterministic topological sorting of a directed acyclic graph using Kahn's algorithm and a priority queue to guarantee lexicographical tie-breaking.
OpenAISoftware EngineerCoding & AlgorithmsTechnical Screen
OpenAI interview experiences
All 49 →- Failed the Phone Screen on a Malloc ImplementationOpenAI · Software Engineer · Technical Screen · Oct 2026Rejected
A recruiter reached out to me. I think my background was a good fit, because they only screened me a little before scheduling the phone interview. I got one question, malloc, with some tests provided. Part 1 was malloc/free. I wrote it by hand, using a list to simulate a linked list, and I couldn't get it to pass in one go. I debugged for a while, then the interviewer gave me a hint, I rewrote a…
- Fault-Tolerant Queue Coding and Online Devbox Design Phone ScreensOpenAI · Software Engineer · Technical Screen · Oct 2026In progress
I interviewed last week. After work I prepared on and off for over a month, and I went through basically all the questions on the forum. The phone screen was two rounds, one coding and one design. The coding question was a fault tolerant queue. I had to implement enqueue, reserve, fail and a DLQ, and they gave unit tests that all had to pass. The first part went fairly smoothly and all the tests…
- Fault-Tolerant Work Queue Coding Plus a Metrics Monitoring Design RoundOpenAI · Software Engineer · Technical Screen · Oct 2026In progress
Coding Fault-Tolerant Work Queue I solved the first part but got stuck on one silly bug which took a long time, but I got it to green eventually. I coded up the second part quickly but couldn't run the code due to time. The interviewer said it should be okay, that I was very close, and that I am good. System Design Metrics monitoring variation I did okay in this round. The interviewer didn't seem…
- Phone Screen Failed on a Fault Tolerant Queue and a Typing Race DesignOpenAI · Software Engineer · Technical Screen · Oct 2026Rejected
I had two phone screen rounds, one coding and one design. The coding round was a fault tolerant queue. I had to implement enqueue, reserve, fail, and a DLQ, and there were 7 unit tests that all had to pass. Part 2 added task dependencies. Each task comes with a cooldown after it gets preempted, and you have to use the preempt timestamp to work out yourself when the cooldown ends. Also, when a tas…
- System Design for a Real-Time Trivia Battle Royale PlatformOpenAI · Software Engineer · Onsite · Oct 2026
Sharing the system design question from one round of my OpenAI technical interview. The question was given on the spot, and the design below is my solution. Happy to discuss. Question Design a real-time trivia battle royale platform: dozens to a hundred or so players join a room, questions are released round by round, and each round eliminates the players who answer wrong and the slowest player.…
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