DoorDash interview notes, page 25 of 42

“Bigger scope than I expected.” 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.

“This wasn't a soft opener.” 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 started with users and campaigns and then kind of free-associated from there: pledges, payments, receipts.” 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.

“Recognized it as combination sum pretty fast, which helped.” 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.

“My first instinct was plain BFS flood-fill on U, which is the right skeleton, but I initially forgot to cross-check D during traversal and just checked at the end per cluster.” 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 core pairing logic wasn't too bad once I decided to group events by orderId and sort within each group.” 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 thing sprawled fast.” The rest of the author's notes on Machine Learning 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 on the discovery phase and ran out of steam before getting to concrete solutions.” 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 jumped straight into supply-side causes (vendor inventory lag, picker errors) and almost forgot to consider demand-side spikes like promotions driving unexpected volume.” The rest of the author's notes on Data Scientist 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 started with users and workouts and thought I was on the right track, but then realized I had no clean way to model exercises within a workout without creating a mess of junction tables.” 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.