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ThoughtWorks Application Developer Interview Questions and Answers

Updated 30 Apr 2025

19 Interview questions

An Application Developer was asked 1mo ago
Q. Given the head of a singly linked list, reverse the list, and return the reversed list.
Ans. 

Reversing a linked list involves changing the direction of its pointers to reverse the order of nodes.

  • Iterative approach: Use three pointers (prev, current, next) to reverse links.

  • Example: For list 1 -> 2 -> 3, after reversal it becomes 3 -> 2 -> 1.

  • Recursive approach: Reverse the rest of the list and adjust pointers.

  • Example: Recursively reverse 1 -> 2 -> 3, then link 2 to 1 and 3 to 2.

An Application Developer was asked 4mo ago
Q. What is the internal working of a HashMap in Java?
Ans. 

HashMap in Java is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.

  • HashMap uses hashing to store and retrieve key-value pairs

  • It uses an array of linked lists to handle collisions

  • The key's hash code is used to determine the index in the array where the key-value pair is stored

  • HashMap allows one null key and multiple null values

  • Example: HashMap<String, Integer> map ...

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An Application Developer was asked 4mo ago
Q. Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may assume that each input would have exactly one solution, and you may not use ...
Ans. 

The Two Sum problem involves finding two numbers in an array that add up to a specific target sum.

  • Given an array of integers and a target sum, identify two numbers that sum to the target.

  • Example: For array [2, 7, 11, 15] and target 9, the answer is indices 0 and 1 (2 + 7 = 9).

  • Use a hash map to store numbers and their indices for efficient lookup.

  • Time complexity can be O(n) with a hash map, compared to O(n^2) with ...

An Application Developer was asked 8mo ago
Q. How does multithreading work?
Ans. 

Multithreading allows multiple threads to execute concurrently within a single process.

  • Multithreading allows for parallel execution of tasks within a single process.

  • Each thread has its own stack and runs independently of other threads.

  • Threads share the same memory space, allowing for communication and data sharing.

  • Multithreading can improve performance by utilizing multiple CPU cores efficiently.

  • Examples of multit...

An Application Developer was asked 11mo ago
Q. Design a HashMap.
Ans. 

A HashMap is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.

  • Use an array of linked lists to handle collisions

  • Implement methods for adding, removing, and retrieving key-value pairs

  • Use a hash function to determine the index of the array where each key-value pair should be stored

An Application Developer was asked
Q. Why is Python used for data science?
Ans. 

Python is used for data science due to its simplicity, readability, extensive libraries, and community support.

  • Python is easy to learn and read, making it accessible for beginners and experts alike

  • Python has a wide range of libraries like NumPy, Pandas, and Scikit-learn for data manipulation and analysis

  • Python has a strong community support with active forums and resources for data science enthusiasts

  • Python's vers...

An Application Developer was asked
Q. How does a HashMap work on the backend?
Ans. 

HashMap is a data structure commonly used in backend development for efficient key-value storage and retrieval.

  • HashMap is a collection that stores key-value pairs and allows for fast retrieval of values based on keys.

  • It is commonly used in backend development for caching, session management, and data storage.

  • Example: HashMap<String, Integer> employeeSalaries = new HashMap<>(); employeeSalaries.put("Ali...

Are these interview questions helpful?
An Application Developer was asked
Q. Describe a problem you solved using OOP principles and clean code practices.
Ans. 

Utilize OOP principles to design a clean, maintainable solution for the given problem.

  • Encapsulation: Use classes to bundle data and methods, e.g., a 'Patient' class with attributes like 'name' and 'age'.

  • Inheritance: Create a base class 'Employee' and derive 'Doctor' and 'Nurse' classes to share common properties.

  • Polymorphism: Implement a method 'calculateSalary()' in both 'Doctor' and 'Nurse' classes to handle dif...

An Application Developer was asked
Q. Tell me about a project you worked on, including the technologies used and the reasons for choosing them.
Ans. 

Choosing the right technology stack is crucial for project success, impacting performance, scalability, and maintainability.

  • Technology selection should align with project requirements and team expertise.

  • For web applications, using React for the frontend and Node.js for the backend can enhance performance and developer productivity.

  • In mobile app development, Flutter allows for cross-platform development, reducing t...

An Application Developer was asked
Q. Design a list to show songs in the year in which they were published.
Ans. 

Create an array of song titles sorted by year of publication.

  • Create an array of song objects with properties for title and year of publication.

  • Sort the array by year of publication.

  • Extract the titles of the songs into a separate array.

  • Return the array of song titles.

ThoughtWorks Application Developer Interview Experiences

26 interviews found

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I appeared for an interview in Aug 2024.

Round 1 - Coding Test 

4 coding question easy level questions based on arrays and strings

Round 2 - Assignment 

Code pairing round need to use oops to solve the problem

Round 3 - Technical 

(3 Questions)

  • Q1. Two sum problem
  • Ans. 

    The Two Sum problem involves finding two numbers in an array that add up to a specific target sum.

    • Given an array of integers and a target sum, identify two numbers that sum to the target.

    • Example: For array [2, 7, 11, 15] and target 9, the answer is indices 0 and 1 (2 + 7 = 9).

    • Use a hash map to store numbers and their indices for efficient lookup.

    • Time complexity can be O(n) with a hash map, compared to O(n^2) with a bru...

  • Answered by AI
  • Q2. Internal working of hashmap
  • Ans. 

    HashMap in Java is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.

    • HashMap uses hashing to store and retrieve key-value pairs

    • It uses an array of linked lists to handle collisions

    • The key's hash code is used to determine the index in the array where the key-value pair is stored

    • HashMap allows one null key and multiple null values

    • Example: HashMap<String, Integer> map = new...

  • Answered by AI
  • Q3. Sql queries on aggregate function
Round 4 - HR 

(2 Questions)

  • Q1. Gender equality
  • Q2. Situation based question

Interview Preparation Tips

Interview preparation tips for other job seekers - be prepared on oops and DSA

Skills evaluated in this interview

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I appeared for an interview in Jan 2025.

Round 1 - Aptitude Test 

Coding plus aptitude

Round 2 - Coding Test 

Code pairing round with one question and an hour to solve

Round 3 - Technical 

(2 Questions)

  • Q1. Oops, dsa, java
  • Q2. Projesct related
Round 4 - Culture 

(1 Question)

  • Q1. Cultural fit round was kinda HR but more topics involved

Interview Preparation Tips

Interview preparation tips for other job seekers - All the best. Connect with ppl from LinkedIn for more guidance
Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

2 leetcode medium level type problems were given. This was a cut-off test were majority will be cut-off.

Round 2 - Coding Test 

Long coding round - Paired with another thoughtworker

Round 3 - Technical 

(2 Questions)

  • Q1. Questions on project
  • Q2. Frameworks related
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
-

I appeared for an interview in Feb 2025, where I was asked the following questions.

  • Q1. I had a recruiter screening round in which I qualified for the cod pairing round. During the interviews, I was asked to identify code smells and then write code to calculate the usage cost for electricity....
  • Q2. Yet to know the results of the round
Interview experience
1
Bad
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Recruitment Consulltant and was interviewed in May 2024. There were 2 interview rounds.

Round 1 - Coding Test 

Coding test contains 4 coding question easy to medium, Topic Array, String but DSA questions are in image formate first you have to decode the image then code.

Round 2 - Code Pairing 

(3 Questions)

  • Q1. Some question from resume project.
  • Q2. How we can improve this project
  • Q3. Add 20% discount code, Implement cashback
  • Ans. 

    To add a 20% discount code and implement cashback in an application.

    • Create a discount code field in the application where users can enter the code to avail 20% off.

    • Calculate the discounted price by applying the 20% discount on the original price.

    • Implement a cashback feature where users receive a certain percentage of the purchase amount back as cashback.

    • Ensure that the cashback amount is credited to the user's account ...

  • Answered by AI

Interview Preparation Tips

Topics to prepare for ThoughtWorks Application Developer interview:
  • DSA
  • OOPS
Interview preparation tips for other job seekers - I had a very negative or wrost experiance with ThoughtWorks during the interview I was able to solve all code pairing programming question without any mistakes or not taking a single hints. It seemed like everything was going well. However after two days i received a rejection mail.

HR said that during the interview my thought process didn't align with the interviewer. Honestly, during the 2 hours of interview. They never mentioned any concerns about my approach or wanting more from me. They simply presented a problems and i solved then they moved on to the next one.

If they weren't happy with my approach, they should have told me to explain further or said that wanted a more optimal soltion something like.

As a fresher, handling such pressure is challenging, especially since we face more struggles than experienced candidates. If a company is not inclined to hire freshers, they should avoid accepting our applications and avoid playing with our emotions.

Interviewers Name: Deepti Sharma, Ajay Kumar
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

Online hackerrank test

Round 2 - Technical 

(2 Questions)

  • Q1. Code pairing round
  • Q2. Solving a problem and improving it
Round 3 - Technical 

(1 Question)

  • Q1. Question on previous experience
Round 4 - HR 

(1 Question)

  • Q1. Basic HR questions

Interview Preparation Tips

Interview preparation tips for other job seekers - Must have good problem solving skills and a cool temper
Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

Domain modeling, oops, clean code

Round 2 - Technical 

(3 Questions)

  • Q1. General technical dicussions in resume
  • Q2. About project we worked on?
  • Q3. LLD system design question
Interview experience
4
Good
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(1 Question)

  • Q1. Basic dsa questions would be asked
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Technical 

(1 Question)

  • Q1. OOP questions , clean coding
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Campus Placement and was interviewed before Apr 2023. There was 1 interview round.

Round 1 - Technical 

(4 Questions)

  • Q1. Python basic questions
  • Q2. Why python is used for data science
  • Ans. 

    Python is used for data science due to its simplicity, readability, extensive libraries, and community support.

    • Python is easy to learn and read, making it accessible for beginners and experts alike

    • Python has a wide range of libraries like NumPy, Pandas, and Scikit-learn for data manipulation and analysis

    • Python has a strong community support with active forums and resources for data science enthusiasts

    • Python's versatili...

  • Answered by AI
  • Q3. Questions related to projects
  • Q4. Hasmap working on the backend
  • Ans. 

    HashMap is a data structure commonly used in backend development for efficient key-value storage and retrieval.

    • HashMap is a collection that stores key-value pairs and allows for fast retrieval of values based on keys.

    • It is commonly used in backend development for caching, session management, and data storage.

    • Example: HashMap<String, Integer> employeeSalaries = new HashMap<>(); employeeSalaries.put("Alice", ...

  • Answered by AI

Skills evaluated in this interview

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Interview Tips & Stories
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Can speak English, can’t deliver in interviews
I feel like I can't speak fluently during interviews. I do know english well and use it daily to communicate, but the moment I'm in an interview, I just get stuck. since it's not my first language, I struggle to express what I actually feel. I know the answer in my head, but I just can’t deliver it properly at that moment. Please guide me
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ThoughtWorks Interview FAQs

How many rounds are there in ThoughtWorks Application Developer interview?
ThoughtWorks interview process usually has 2-3 rounds. The most common rounds in the ThoughtWorks interview process are Technical, Coding Test and HR.
How to prepare for ThoughtWorks Application Developer interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at ThoughtWorks. The most common topics and skills that interviewers at ThoughtWorks expect are Javascript, TDD, Agile, Continuous Integration and Java.
What are the top questions asked in ThoughtWorks Application Developer interview?

Some of the top questions asked at the ThoughtWorks Application Developer interview -

  1. add a new feature using SOLID principles and explain your thought proc...read more
  2. A problem was given which was required to be solved using the concepts of OOPS ...read more
  3. explain the HTTP status code for your te...read more
What are the most common questions asked in ThoughtWorks Application Developer HR round?

The most common HR questions asked in ThoughtWorks Application Developer interview are -

  1. What are your salary expectatio...read more
  2. Why are you looking for a chan...read more
  3. What are your strengths and weakness...read more
How long is the ThoughtWorks Application Developer interview process?

The duration of ThoughtWorks Application Developer interview process can vary, but typically it takes about less than 2 weeks to complete.

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Overall Interview Experience Rating

4.2/5

based on 23 interview experiences

Difficulty level

Easy 7%
Moderate 93%

Duration

Less than 2 weeks 80%
2-4 weeks 20%
View more

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ThoughtWorks Application Developer Salary
based on 669 salaries
₹6.8 L/yr - ₹20 L/yr
10% more than the average Application Developer Salary in India
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ThoughtWorks Application Developer Reviews and Ratings

based on 105 reviews

3.9/5

Rating in categories

4.0

Skill development

4.1

Work-life balance

3.2

Salary

3.6

Job security

3.9

Company culture

3.1

Promotions

3.7

Work satisfaction

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