DoorDash interview notes, page 11 of 42

“This one is mostly mechanical once you realize you need two layers: first aggregate per (month, customer) to find who clears the 30-order threshold, then join that back to get their share of total orders.” The rest of the author's notes on Data Scientist interview at DoorDash, 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 basic aggregation down pretty fast but fumbled a bit explaining when DENSE_RANK actually matters versus RANK.” The rest of the author's notes on Software Engineer interview at DoorDash, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“The greedy part clicked pretty fast: start a batch at the leftmost unused item, keep pulling in items that fit within B count and within the W window, then close the batch and repeat.” The rest of the author's notes on Machine Learning Engineer interview at DoorDash, 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 input validation at the API boundary and talked about rejecting early, but the interviewer kept pushing on the tolerate-vs-reject tradeoff.” The rest of the author's notes on Software Engineer interview at DoorDash, 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 straight to user segmentation which felt right in the moment but I spent way too long on it before getting to actual features.” The rest of the author's notes on Product Manager interview at DoorDash, Onsite - Product Sense / Strategy round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“This one caught me because I expected them to give me a prompt.” The rest of the author's notes on Software Engineer interview at DoorDash, 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 spent too long in the problem identification phase and kind of rambled through user segments before landing on anything concrete.” The rest of the author's notes on Product Manager interview at DoorDash, 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 into features and had to backtrack when they asked who exactly I was designing for.” The rest of the author's notes on Product Manager interview at DoorDash, 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 underestimated this.” The rest of the author's notes on Software Engineer interview at DoorDash, 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 a big compound question and I underestimated how much they'd push on the failure handling piece.” The rest of the author's notes on Software Engineer interview at DoorDash, Onsite - System Design / Architecture round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.