OpenAI Software Engineering Fundamentals Interview Questions
Practice the exact questions companies are asking right now.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Design First-Fit and Best-Fit Memory Allocation
Design the core of a heap allocator over one contiguous managed region. Blocks have an address, size, and free/allocated state. Allocation requests sp...
Implement a Set with Readable Snapshots
Implement a set that supports add(value), remove(value), contains(value), snapshot(), and containsAt(snapshot_id, value). Creating a snapshot returns ...
Clarify and Design Social-Graph Milestones
Clarify and Design Social-Graph Milestones An interview exercise progresses through a social graph with snapshots, a milestone for retrieving follower...
Count Machines and Recover a Distributed Tree Topology
Count Machines and Recover a Distributed Tree Topology A cluster's machines form a rooted tree. Design a protocol that returns the number of machines ...
Implement a Recoverable In-Memory Key-Value Store
Implement a Recoverable In-Memory Key-Value Store Design and implement a single-process key-value store whose working set is held in memory and whose ...
Implement a Simple Memory Allocator
Design and implement a simplified memory allocator exposing malloc(size) and free(ptr) over a single fixed-size heap (a contiguous byte array). The al...
Refactor a Chatbot into Clean Object-Oriented Components
Prepare for a OpenAI software engineering interview question about refactor a chatbot into clean object-oriented components. The prompt highlights pra...
Debug a Concurrent Job Scheduler
You are handed a buggy Python job scheduler that runs many independent jobs concurrently. Each job has an ID, a callable to execute, a maximum retry c...
Implement A Mobile Chat Interface In An Existing Codebase
You are given an existing mobile codebase and asked to implement a ChatGPT-style chat screen in about 40 minutes. Describe how you would read the proj...
Explain KV cache in Transformer inference
Question In Transformer-based large-language-model inference, what is a key-value (KV) cache? Give a complete, systems-level explanation that covers: ...
Design First-Fit and Best-Fit Memory Allocation
Design First-Fit and Best-Fit Memory Allocation Design a simplified allocator over one contiguous arena of N bytes. It supports: - allocate(size, stra...
Analyze matrix multiplication complexity
In an ML coding interview, you're handed a PyTorch file and asked a series of complexity questions about the operations in it. One of them: Given two ...
Design an Extensible Simulation Engine
This question evaluates object-oriented design, state modeling, API design, modularity, testability, and the ability to architect an extensible simula...
Build a Reliable Streaming Chat UI
You are building a React-based chat interface where assistant responses stream into the UI token by token in real time (the same UX as a typical LLM c...
Model particle hits on a screen
A point source at (0, 0) emits particles toward an infinite vertical screen located at x = 1. For each particle, sample an angle theta uniformly from ...
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 ...
Implement an Extensible Chatbot App
Implement a ChatApp class that processes user messages and routes them to bot responders. The system must support multiple bot types, and the design m...
Design a social network with snapshots
This question evaluates understanding of data structures, graph representations, immutability and snapshot/versioning strategies for in-memory systems...
Explain JS threading and useState vs useRef
Answer the following conceptual questions about JavaScript and React: 1. JavaScript and multithreading - How does JavaScript's execution model wo...