ThoughtWorks Software Engineer Interview Questions and Answers

Q1. Tell me about OOPS - Explain modular code
Ans. 
OOPS is a programming paradigm that uses objects to represent real-world entities. Modular code is code that is divided into separate, independent parts.
• OOPS stands for Object-Oriented Programming System

• It focuses on creating reusable code and reducing complexity

• Modular code is easier to maintain, test, and debug

• It involves breaking down code into smaller, self-contained modules

• Each module performs a specific task and ...read more
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It was 2 medium Leetcode questions. I did 1 well and the other one with an okayish approach.

Q1. Tell me about a challenging project
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Q2. A simple stacks based question
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Q1. Tell which tech stack you’d use for which case
Ans. 
For web development, I'd use MERN stack. For mobile development, I'd use React Native. For data analysis, I'd use Python stack.
• MERN stack (MongoDB, Express.js, React.js, Node.js) for web development

• React Native for mobile development

• Python stack (NumPy, Pandas, Matplotlib) for data analysis

• Consider the project requirements and scalability before choosing a tech stack
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Q1. What do you think about affirmative action
Ans. 
Affirmative action is a complex issue with both pros and cons.
• Affirmative action can help promote diversity and equal opportunities for underrepresented groups.

• However, it can also lead to reverse discrimination and undermine merit-based hiring practices.

• Ultimately, the effectiveness of affirmative action depends on how it is implemented and monitored.

• For example, some companies may set quotas for hiring certain groups...read more
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Round duration - 180 Minutes
Round difficulty - Easy

it was an coding round. i was not able to solve questions

Q1. 
Anagram Pairs Verification Problem
Your task is to determine if two given strings are anagrams of each other. Two strings are considered anagrams if you can rearrange the letters of one string to form the...read more
Ans. 
Determine if two strings are anagrams of each other by checking if they contain the same characters.
• Create character frequency maps for both strings and compare them.

• Sort both strings and compare if they are equal.

• Use a hash table to store character counts and check if they are the same for both strings.
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Q2. 
Remove Character from String Problem Statement
Given a string str and a character 'X', develop a function to eliminate all instances of 'X' from str and return the resulting string.
Input:
The first lin...read more
Ans. 
Develop a function to remove all instances of a given character from a string.
• Iterate through the string and build a new string excluding the specified character.

• Use a StringBuilder or similar data structure for efficient string manipulation.

• Handle edge cases such as empty string or character not found in the input string.
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Q3. 
Complete String Problem Statement
Given an array of strings A of size N, determine the longest complete string. A string is deemed complete if every prefix of the string also appears in the array. If mult...read more
Ans. 
Find the longest complete string in an array of strings, where every prefix of the string also appears in the array.
• Iterate through each string in the array and check if all its prefixes exist in the array.

• Keep track of the longest complete string found so far, and return the lexicographically smallest one if multiple exist.

• If no complete string is found, return 'None'.
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Q4. 
Segregate Odd-Even Problem Statement
In a wedding ceremony at NinjaLand, attendees are divided into two groups: bride’s side and groom’s side. Attendees from the bride’s side hold odd numbers, while those...read more
Ans. 
Rearrange attendees from bride's side and groom's side while maintaining original order within each group.
• Iterate through the linked list and separate odd and even numbers into two separate lists.

• Merge the two lists while maintaining the original order within each group.

• Output the rearranged linked list with bride's side attendees followed by groom's side attendees.
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Q5. 
Boundary Sum Problem Statement
Given a Binary Tree with 'N' nodes, compute and return the sum of all its boundary nodes. The boundary nodes include the root node, leftmost external nodes, rightmost extern...read more
Ans. 
The Boundary Sum Problem involves calculating the sum of boundary nodes in a binary tree.
• Traverse the tree in a specific order to identify the boundary nodes (root, leftmost, rightmost, and leaves)

• Keep track of the sum of these boundary nodes as you traverse the tree

• Handle cases where nodes have no children (-1)
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Quantitative ability and logical ability

Q1. In which programming language you are good at?
Ans. 
I am proficient in Java and Python.
• Strong understanding of object-oriented programming concepts

• Experience with Java frameworks such as Spring and Hibernate

• Proficient in Python libraries such as NumPy and Pandas
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Q2. Write a program to print HCF of numbers as output
Ans. 
Program to print HCF of numbers as output
• Take input of two numbers from user

• Find the smaller number between the two

• Run a loop from 1 to the smaller number

• Check if both numbers are divisible by the current loop variable

• If yes, update the HCF variable

• Print the HCF as output
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Q1. Why should we hire you?
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