ByteDance Senior QA Engineer Interview Questions and Answers

Round duration - 60 minutes
Round difficulty - Medium

It started with an informal talk after he gave his introduction. We talked about the cyclone that was going to be there and what I did in my internship and my previous projects. Then we moved to questions. After solving both questions he asked if I had questions.

Q1. 
Kth Largest Element Problem Statement
Given an array of distinct positive integers and a number 'K', your task is to find the K'th largest element in the array.
Example:
Input:
Array: [2,1,5,6,3,8], K ...read more
Ans. 
Find the Kth largest element in an array of distinct positive integers.
• Sort the array in non-increasing order

• Return the Kth element from the sorted array

• Handle multiple test cases
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Q2. 
Orange Rotting Problem Statement
Consider a grid containing oranges. Each cell in this grid can hold one of three integer values:
• Value 0: Represents an empty cell.
• Value 1: Represents a fresh orang...read more
Ans. 
The task is to determine the minimum time required for all fresh oranges to become rotten in a grid.
• Create a queue to store the rotten oranges and their time of rotting.

• Iterate through the grid to find the initial rotten oranges and add them to the queue.

• Perform BFS by popping each rotten orange from the queue, rot adjacent fresh oranges, and add them to the queue with updated time.

• Continue until the queue is empty, ke...read more
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Round duration - 45 minutes
Round difficulty - Easy

This was a design round.

Round duration - 60 Minutes
Round difficulty - Easy

Q1. 
Find the k-th Node from the End of a Linked List
Given the head node of a singly linked list and an integer 'k', this problem requires you to determine the value at the k-th node from the end of the linke...read more
Ans. 
To find the k-th node from the end of a linked list, iterate through the list to determine the size, then traverse again to reach the k-th node from the end.
• Iterate through the linked list to determine its size.

• Calculate the position of the k-th node from the end based on the size of the list.

• Traverse the list again to reach the k-th node from the end.

• Return a pointer to the k-th node from the end.
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Round duration - 60 Minutes
Round difficulty - Easy

High level System Design

Q1. Can you design a system like Uber, explaining the various components and architecture involved?
Ans. 
Designing a system like Uber involves components like user app, driver app, server, database, and algorithms for matching and routing.
• User app for booking rides and tracking

• Driver app for accepting rides and navigation

• Server for handling requests and communication between apps

• Database for storing user, driver, and ride information

• Algorithms for matching riders with drivers and routing
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Round duration - 45 minutes
Round difficulty - Easy

Basic HR questions

Over the questions asked were difficult

Q1. Technical roud was about Maps and how to represent maps in Python using 2D Array
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Round duration - 90 Minutes
Round difficulty - Medium

it was time bound coding test round. The questions were from array and string. There were 2 questions.

Q1. 
K-Palindrome Problem Statement
Determine whether a given string str can be considered a K-Palindrome.
A string is considered a K-Palindrome if it can be transformed into a palindrome after removing up to...read more
Ans. 
The problem is to determine whether a given string can be considered a K-Palindrome by removing up to 'k' characters.
• Iterate through the string from both ends and check if characters match, if not increment removal count

• If removal count is less than or equal to k, return True, else return False

• Use dynamic programming to optimize the solution by storing subproblem results
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Round duration - 30 Minutes
Round difficulty - Easy

in this round manager spoke to me and explained about project and joining date later hr spoke to me regarding on boarding process

Round duration - 120 minutes
Round difficulty - Easy

It was a mix of mathematical aptitude, logical ability, and puzzles along with 2 programming questions of easy and medium levels. Time was enough and no sectional time was present. 1-2 MCQs on SQL was also present.

Q1. 
Boolean Matrix Transformation Challenge
Given a 2-dimensional boolean matrix mat of size N x M, your task is to modify the matrix such that if any element is 1, set its entire row and column to 1. Specifi...read more
Ans. 
Modify a boolean matrix such that if any element is 1, set its entire row and column to 1.
• Iterate through the matrix to find elements with value 1

• Store the row and column indices of these elements

• Update the entire row and column for each element found to be 1
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Round duration - 60 minutes
Round difficulty - Easy

It was an online video interview round on HackerEarth with a simultaneous code option. It was mostly justifying your resume in the first 15 minutes. After that OOPS was majorly asked. Basics of programming including questions on STL were asked. A class that required inheritance was asked by the interviewer to write. I was helped by the interviewer if I got stuck somewhere, Some questions on the implementation of hashmaps and priority queues were also asked. A puzzle was asked which luckily struct to me at that moment.

Q1. Personal information,
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Q2. Work experience
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Q1. Personal discussion
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Q2. Discuss about package
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Q1. Design Splitwise Application (LLD)
Ans. 
Design a Splitwise application for managing shared expenses among friends.
• Implement user authentication and authorization for secure access.

• Create a user-friendly interface for adding expenses and splitting them among friends.

• Develop algorithms for calculating balances and settling debts between users.

• Include features for adding comments, attaching receipts, and generating reports.

• Consider scalability and performance o...read more
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1 hr coding round required me to solve 2 leetcode medium questions

Q1. Design an online grocery store basically zepto.
Ans. 
Design an online grocery store similar to zepto.
• Implement user-friendly interface for easy navigation

• Include search functionality for quick product discovery

• Offer secure payment options for customer convenience

• Provide delivery options with tracking feature

• Include customer reviews and ratings for products

• Implement inventory management system for real-time updates
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