Robinhood interview notes, page 5 of 9

“This sounds broad until you realize how many moving parts there are.” The rest of the author's notes on Software Engineer interview at Robinhood, Onsite - System Design / Architecture round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“My first instinct was just to filter user_info on state = 'CA' and call it a day.” The rest of the author's notes on Software Engineer interview at Robinhood, 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 with two separate state objects: a 2D grid and an events list, then derived one from the other.” The rest of the author's notes on Frontend Engineer interview at Robinhood, 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 with the usual suspects: NPS, app store ratings, support ticket volume, churn rate.” The rest of the author's notes on Product Manager interview at Robinhood, Hiring Manager Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“The join on customer_id is obvious, but I almost forgot to filter membership_type to 'Gold' before worrying about the date range.” The rest of the author's notes on Data Scientist interview at Robinhood, 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 groupby-apply because it felt natural, sort by event_time within each user group, compute time diffs, label session breaks with cumsum.” The rest of the author's notes on Software Engineer interview at Robinhood, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“This one is more involved than it looks.” The rest of the author's notes on Software Engineer interview at Robinhood, 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 by splitting the metric into numerator and denominator, which felt right, but then I kind of rambled through possible causes without a real structure.” The rest of the author's notes on Data Scientist interview at Robinhood, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“This is where I probably spent too long on context-setting.” The rest of the author's notes on Software Engineer interview at Robinhood, Onsite - Behavioral / Leadership round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“This is a massive question and I did not scope it fast enough.” The rest of the author's notes on Software Engineer interview at Robinhood, Onsite - System Design / Architecture round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.