Meta interview notes, page 235 of 238

“This one tripped me up for a second because the answer feels like it should be zero (lazy reviewers never go negative), and it basically is.” The rest of the author's notes on Data Scientist interview at Meta, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“This was basically a full product strategy case and I kept waiting for it to pivot into something more analytical.” The rest of the author's notes on Data Scientist interview at Meta, Onsite - Product Sense / Strategy round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“I went straight to engagement metrics and the interviewer kind of waited for me to say more.” The rest of the author's notes on Data Scientist interview at Meta, 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 candidate generation and worked forward, which felt logical but in hindsight I think they wanted me to anchor on scale constraints first.” The rest of the author's notes on Machine Learning Engineer interview at Meta, 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 is basically a full ML system design in one question.” The rest of the author's notes on Machine Learning Engineer interview at Meta, 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 jumped straight to a max-heap of size k and walked through it, which was the right call.” The rest of the author's notes on Machine Learning Engineer interview at Meta, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“I went straight to engagement stuff: click-through rate, sessions driven by the notification, maybe bookings if the app had that.” The rest of the author's notes on Data Scientist interview at Meta, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“This was the centerpiece question and I spent way too long on S2 before realizing I needed to account for what the classifier actually does to the composition of shown impressions.” The rest of the author's notes on Data Scientist interview at Meta, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“I got the stack approach pretty quickly: track each character alongside a count, and whenever a count hits 2 (or k in the follow-up), collapse it.” The rest of the author's notes on Software Engineer interview at Meta, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“This question is basically three separate interviews stapled together.” The rest of the author's notes on Data Scientist interview at Meta, Onsite - Product Sense / Strategy round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.