Google·Software Engineer·Technical Phone Screen
- What are the common pitfalls of A/B testing?
“I went in thinking I'd just list a few things like peeking at results early and calling it a day.”
FAANG / Big Tech
Most of these Google write-ups come from Software Engineers (1,167), then Product Managers (686) and Data Scientists (125). The most reported rounds are the product sense round (667), the technical phone screen (660), the behavioral / leadership round (252) and the onsite coding round (214).
2146 interview notes · updated Oct 2026
“I went in thinking I'd just list a few things like peeking at results early and calling it a day.”
“My first instinct was a sorted list and binary search for neighbors, which is the right direction, but I fumbled on the 'keep removing until none left' loop.”
“This is a deceptively wide question.”
“The one-input constraint is what makes this interesting and also where I got a bit turned around.”
“Took me longer than it should have to recognize this as a binary search on the answer problem.”
“I spent the first few minutes trying to figure out whether they wanted a PM-style answer or an actual architecture breakdown.”
“Nailed the first half, talked about traffic filtering and blocking unauthorized access, felt good.”
“This is the kind of question where you can spiral fast if you don't anchor on what you're actually optimizing for.”
“This is a beast of a question and I did not treat it like one at first.”
“This one has a lot of surface area and I think I spread myself too thin.”