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ByteDance interview notes, page 23 of 29

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

ByteDance·Software Engineer·Technical Phone Screen

Jun 2026
Bytedance coding screen, one question on parentheses generation. Pretty standard stuff but the implementation details trip you up if you haven't drilled backtracking recently.
  • 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.”

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ByteDance·Software Engineer·Technical Phone Screen

Jun 2026
Bytedance SWE coding round, one problem, and it did not go great. Needed hints to get through it and left feeling like I'd underprepped the tree stuff.
  • Given a binary tree where each node has a pointer to its parent, find the lowest common ancestor of two given nodes.

“I knew the general LCA problem but had not worked through the version with parent pointers.”

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ByteDance·Software Engineer·Technical Phone Screen

Jun 2026
Bytedance software engineering interview with a classic bracket validation problem. Pretty standard algorithmic screen, nothing too wild, but the kind of question where you either know the pattern cold or you start second-guessing yourself mid-solution.
  • Given a string containing only bracket characters, write a function to determine whether the brackets are all properly matched and closed in the correct order.

“Stack problem, pretty textbook.”

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ByteDance·Machine Learning Engineer·Onsite - Behavioral / Leadership

Jun 2026
Second behavioral round at Bytedance for an MLE role, and this one went deeper than the first. Same project, but they wanted the granular stuff: what you personally built, what you threw out and why, where things broke. Felt like a consistency check more than anything.
  • Walk me through the specific technical decisions you made on this project, including options you considered but ultimately rejected.
  • Describe a specific failure or setback during this project and how you recovered from it.
  • What was your individual contribution versus what your teammates handled? Be specific.
  • What was the quantified impact of this project, and how did you measure it?

“This is where repeating your earlier round answers backfires.”

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ByteDance·Machine Learning Engineer·Technical Phone Screen

Jun 2026
Bytedance ML engineer interview that came down to a classic n-queens backtracking problem. I tried to get clever with an iterative stack-based approach instead of the standard recursion and paid for it.
  • Implement a solution to the n-queens problem that returns all distinct board configurations, where no two queens share a row, column, or diagonal.

“I went iterative with an explicit stack instead of just doing the clean recursive backtracking everyone knows.”

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ByteDance·Software Engineer·Technical Phone Screen

Jun 2026
Second round at Bytedance for a Data Engineer role, met with the actual team. They went through past experience first, then squeezed in a SQL window function problem with whatever time was left.
  • Walk us through your relevant past experience.
  • Write a SQL query using a window function to solve a given problem.

“Pretty standard opener, just talked through what I'd done before.”

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ByteDance·Software Engineer·Technical Phone Screen

Jun 2026
Bytedance SWE interview with a classic array problem that sounds easy until you actually have to justify your approach under pressure.
  • Given an integer array and an integer k, find the kth largest element in the array.

“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.”

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ByteDance·Software Engineer·Technical Phone Screen

Jun 2026
One coding round at Bytedance for a software engineer role. The problem was a mashup of two classic graph problems and required finding the point with the maximum distance sum. Pretty standard algorithmic stuff but the hybrid nature kept it from being a straight copy-paste solution.
  • Given a grid, find the point that maximizes the sum of distances to all other points. The problem blends island-connectivity logic with a water-rising traversal concept.

“The hybrid framing threw me a bit.”

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ByteDance·Machine Learning Engineer·Technical Phone Screen

Jun 2026
Phone screen for an ML Engineer role at Bytedance. Pretty standard opener, just walk them through your background and projects, but it's easy to underestimate how much prep that actually takes.
  • Walk me through the projects and work you've done. Pick one or two you're proud of and tell me about them.

“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.”

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ByteDance·Software Engineer·Technical Phone Screen

Jun 2026
Did a technical phone screen for a software engineer role at Bytedance. The coding problems weren't too bad but the 2D follow-up added a bit of pressure. Heard back about four days later that I passed.
  • Find the longest subarray consisting of consecutive 1s in a 1D array.
  • Extend the previous problem to a 2D array: find the largest subregion of consecutive 1s.

“Sliding window, pretty much immediately.”

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