Hudson River Trading interview notes, page 1 of 4

“The square part clicked fast.” The rest of the author's notes on Software Engineer interview at Hudson River Trading, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“The reversal timestamps being unsorted was the first thing that tripped me up.” The rest of the author's notes on Software Engineer interview at Hudson River Trading, 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 idea clicked pretty fast: partition the timeline at each direction-change timestamp so you get segments where the watcher's direction is constant, then solve each segment analytically.” The rest of the author's notes on Machine Learning Engineer interview at Hudson River Trading, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“Not what I was bracing for in a quant interview.” The rest of the author's notes on Software Engineer interview at Hudson River Trading, Technical Phone Screen round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.

“The problem was entirely verbal, no written spec, so the first few minutes were just me scribbling and asking clarifying questions to make sure I understood the blocking mechanic.” The rest of the author's notes on Machine Learning Engineer interview at Hudson River Trading, 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 the kind of question where the core idea clicks fast but the edge cases eat you alive.” The rest of the author's notes on Software Engineer interview at Hudson River Trading, 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 started talking about the allocation failing and they just waited.” The rest of the author's notes on Software Engineer interview at Hudson River Trading, 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 deceptively wide.” The rest of the author's notes on Software Engineer interview at Hudson River Trading, 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 the naive all-pairs approach and they immediately asked about input size, which was their way of telling me to think harder.” The rest of the author's notes on Software Engineer interview at Hudson River Trading, 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 to just check each length-3 window and see if any character is a vowel.” The rest of the author's notes on Software Engineer interview at Hudson River Trading, Online Assessment (OA) round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.