Meta·Machine Learning Engineer·Technical Phone Screen
- Write a function that returns the binary representation of a given integer.
“Seemed straightforward but I second-guessed myself on edge cases like negative numbers and zero.”
FAANG / Big Tech
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2377 interview notes · updated Jul 2026
“Seemed straightforward but I second-guessed myself on edge cases like negative numbers and zero.”
“I spent too long on the obvious stuff like report volume and resolution rate before getting to the actual crux of the question.”
“The naive approach is obviously too slow for n up to 2*10^5.”
“The weird part isn't writing the prompt, it's that you have to actually disagree with the AI on the spot.”
“I knew binary search was involved but my first instinct was to just scan linearly, which obviously fails the complexity requirement.”
“I went in thinking this was a simple regex or character scan problem.”
“Seems like a warmup but I rambled way too much.”
“I went straight to use cases, which in hindsight was probably too fast.”
“The 'doesn't need to be shortest' part threw me off a little because my brain immediately went to BFS since that's the classic word ladder setup.”
“Linear scan, count as you go, done.”