ByteDance·Software Engineer·Technical Phone Screen
- Given an integer n, generate all valid combinations of n pairs of parentheses.
“I knew it was backtracking pretty fast but fumbled explaining the pruning conditions out loud.”
FAANG / Big Tech
Most of these ByteDance write-ups come from Software Engineers (194), then Machine Learning Engineers (45) and Data Scientists (17). The most reported rounds are the technical phone screen (227), the system design round (28), the behavioral / leadership round (16) and the onsite coding round (9).
289 interview notes · updated Sep 2026
“I knew it was backtracking pretty fast but fumbled explaining the pruning conditions out loud.”
“I knew the general LCA problem but had not worked through the version with parent pointers.”
“Stack problem, pretty textbook.”
“This is where repeating your earlier round answers backfires.”
“I went iterative with an explicit stack instead of just doing the clean recursive backtracking everyone knows.”
“Pretty standard opener, just talked through what I'd done before.”
“I went with the min-heap approach first because it felt safer to explain, but they pushed back and asked if I could do better on average time complexity.”
“The hybrid framing threw me a bit.”
“Sounds easy until you're actually on the call and realize you haven't thought about how to summarize two years of work in two minutes.”
“Sliding window, pretty much immediately.”