Bytedance Interview Questions
Practice 59 real interview questions from Bytedance. Covers Coding & Algorithms, Behavioral & Leadership, Machine Learning, Software Engineering Fundamentals. For roles including Software Engineer, Data Scientist, Product Manager, Site Reliability Engineer.
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Solve Sliding Window and Grid Search
In a Software Engineer phone screen, the candidate was asked to solve two coding problems. 1. Longest substring with at most k distinct characters ...
Solve String Addition and Expression Evaluation
The interview included two coding problems: 1. Add numbers from character arrays - You are given two non-empty character arrays, where each array r...
Find high-value crypto users and top CTR
You are given three tables. Assume all timestamps are stored in UTC. - users(user_id BIGINT PRIMARY KEY, create_date TIMESTAMP): one row per user acco...
Implement Interval Insert and Dedup
This interview round contained two coding problems: 1. Insert and merge intervals. You are given a list of non-overlapping intervals sorted by start t...
Implement an LRU Cache
Design and implement a fixed-capacity key-value cache that evicts the least recently used item when it becomes full. Support the following operations:...
Find Maximum Chain Activations
You are given n devices, where each device is represented as [x, y, r]. Device i is located at coordinates (x, y) and can directly activate device j i...
Design a High-Frequency Job Scheduler
Design a distributed job scheduler that supports one-time and recurring jobs, including high-frequency tasks that may run every few seconds. The syste...
Reverse Words While Preserving Spaces
Implement a C++ function that reverses the order of words in a string. Assume a word is any maximal sequence of non-space characters, and the input co...
Define Ultra success and detect suspicious transactions
Assume the following relevant columns are available, and all timestamps are stored in UTC: - users(user_id BIGINT PRIMARY KEY, create_date TIMESTAMP, ...
How to triage slow service alerts
A production alert indicates that a web service is experiencing high latency or slow responses. As an SRE, describe how you would triage, investigate,...
Design a Content Moderation Platform
Design a large-scale content moderation system for a social platform that accepts user-generated text, images, and videos. The system should detect po...
Design an Enterprise Tool-Using Agent
Design an enterprise LLM agent that can use external tools to complete multi-step business tasks. Assume the agent may call tools such as document ret...
Explain train-test generalization gap
A model performs very well on the training set but much worse on a held-out test set. Explain why this can happen and how you would diagnose and fix i...
Describe Over-Engineering and UX Wins
After a project deep dive, the interviewer asked two behavioral questions: 1. Describe a time when you designed or implemented something that became m...
Implement several OA simulation problems
Reconstruct and solve the following coding problems from an online assessment. 1. Case-insensitive adjacent differences Given a string s, treat u...
Explain Train-Test Performance Gap
A supervised model for a TikTok-like product problem performs very well on the training set but much worse on a held-out test set. How would you diagn...
How would you troubleshoot Linux services?
You are acting as an SRE responsible for Linux-based services in production. Describe how you would handle the following situations: 1. A server repor...
Find Missing Ranges with Bounds
Given a sorted array of distinct integers nums and two integers lower and upper that define an inclusive interval [lower, upper], return all maximal r...
Solve these string, subset, and date problems
You are asked to solve multiple coding tasks. 1) Reverse word order in a string - Input: a string s containing words separated by spaces (may contain ...
Find Minimum Time Across a Grid
You are given an n x n grid of non-negative integers. Each value represents the earliest time at which that cell becomes traversable. You start at the...