ByteDance Senior QA Engineer Interview Questions and Answers

Q1. Word search II from leetcode
Ans. 
Word search II is a problem where you have to find all words from a given list in a 2D board of characters.
• Use a trie data structure to efficiently search for words in the board.

• Implement a backtracking algorithm to explore all possible paths in the board.

• Optimize the search by pruning branches that cannot lead to a valid word.
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Q1. Tell me about yourself
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45 min round. Similar to Leetcode medium level question.

45 min coding round, 2 question asked

Q1. System design of proximity service
Ans. 
Design a system for proximity service
• Utilize geolocation data to track user locations

• Implement algorithms to calculate proximity between users

• Use real-time updates to notify users of nearby contacts
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Q1. Behavioral questions
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Leetcode question on DFS and BFS. Passed

Develop a ml model to predict pass/no pass decision.

Implement boolean canConstruct(String targetString, String[] dict) which returns true if we can construct the targetString by concatenating the words given in the dictionary

Q1. Implement key value store
Ans. 
Implement a key value store for storing and retrieving data efficiently.
• Use a hash table or a balanced tree data structure to store key-value pairs.

• Implement functions for inserting, updating, deleting, and retrieving key-value pairs.

• Consider implementing features like transactions, concurrency control, and data persistence.

• Example: Implement a simple key value store using a hash table in Python.
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Hacker Rank, 5 questions in total. Topics include operating system, dynamic programming, sql, and so on.

Q1. Chinese Interviewer speaking chinese. One coding questions, a lot of technical questions.
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Q2. What is the underlying database of mysql?
Ans. 
The underlying database of MySQL is InnoDB.
• InnoDB is the default storage engine for MySQL.

• It provides ACID-compliant transactions.

• Supports foreign keys for referential integrity.

• InnoDB is designed for high performance and scalability.
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Q3. How does computer connect with each other IP/TCP?
Ans. 
Computers connect with each other using IP/TCP through a series of protocols and addressing schemes.
• IP (Internet Protocol) assigns a unique address to each device on a network.

• TCP (Transmission Control Protocol) manages the transmission of data between devices.

• Devices communicate by sending packets of data over the network using IP addresses and port numbers.

• Routers and switches help route the packets to their destinat...read more
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Q1. Jump game 1 & 2
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Q2. Design search for top k
Ans. 
Design a search algorithm to find the top k elements in a dataset.
• Use a priority queue to efficiently retrieve the top k elements.

• Implement a max heap to keep track of the top k elements.

• Consider using quickselect algorithm for optimal performance.

• Optimize the search algorithm for time complexity O(n log k).
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Q1. Tiny url design
Ans. 
Tiny URL design involves creating a shorter version of a long URL for easier sharing and tracking.
• Use a hashing algorithm to generate a unique short code for each long URL

• Store the mapping of short code to long URL in a database

• Redirect users from short URL to original URL when accessed
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A coding test in hackrank, 120 min, 5 programming puzzles.

Q1. Introduce myself, and interviewer introduce their team
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Q2. Some question about operating systems, such as process, thread and inter-process commuication
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Q3. Coding session: similar to leetcode 622
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