Amazon·Data Scientist·Online Assessment (OA)
- Write a function that takes a string and returns the length of the longest substring with no repeated characters.
“Knew sliding window was the move but fumbled the hash map part a bit.”
FAANG / Big Tech
Most of these Amazon write-ups come from Software Engineers (1,092), then Data Scientists (182) and Product Managers (165). The most reported rounds are the technical phone screen (618), the behavioral / leadership round (309), the online assessment (228) and the system design round (159).
1581 interview notes · updated Oct 2026
“Knew sliding window was the move but fumbled the hash map part a bit.”
“More involved than I expected for a phone screen.”
“This question is basically five questions stapled together and I did not pace myself well.”
“Straightforward filter and aggregate.”
“This is one of those questions where you nod confidently and then immediately realize you have no idea where to start.”
“I blanked for a second longer than I should have.”
“My first instinct was backtracking through permutations and counting conflicts for each ordering.”
“I had a decent story ready but rambled way too long on the context and barely got to what I actually did.”
“I started with /proc and talked through checking the process's file descriptors, open network connections via /proc/net, and cross-referencing with lsof and netstat.”
“The examples help a lot here.”