OpenAI interview notes, page 12 of 67

“This is the whole interview, basically.” The rest of the author's notes on Machine Learning Engineer interview at OpenAI, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“I started with a naive list-of-dicts approach per table and it felt too simple, so I second-guessed myself mid-explanation and started overcomplicating the schema representation.” The rest of the author's notes on Software Engineer interview at OpenAI, Onsite - System Design / Architecture round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“I went with signup rate as primary, defined as unique users who started a trial divided by unique eligible visitors assigned to each variant.” The rest of the author's notes on Data Scientist interview at OpenAI, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“Started fine, passed the first few test cases, then the last two revealed a whole new constraint: deductions had to happen in end-time order.” The rest of the author's notes on Software Engineer interview at OpenAI, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“There's a lot of surface area here and I think I spread myself too thin early on.” The rest of the author's notes on Software Engineer interview at OpenAI, Onsite - System Design / Architecture round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“This was a lot to unpack in one question.” The rest of the author's notes on Software Engineer interview at OpenAI, Onsite - System Design / Architecture round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“I'd actually seen this one before, which made it worse when I fumbled it.” The rest of the author's notes on Software Engineer interview at OpenAI, Onsite - System Design / Architecture round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“The structure was the tricky part.” The rest of the author's notes on Software Engineer interview at OpenAI, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“I started with a basic hash map and they kept pushing on it.” The rest of the author's notes on Machine Learning Engineer interview at OpenAI, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“The first two parts went fine, linear scan to binary search is pretty standard muscle memory at this point.” The rest of the author's notes on Machine Learning Engineer interview at OpenAI, Onsite - Coding / Algorithms round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.