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ThoughtWorks Application Developer Interview Questions and Answers
20 Interview questions
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.
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 ...
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 ...
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...
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
HTTP is a protocol used for transferring data over the internet.
HTTP stands for Hypertext Transfer Protocol.
It is the foundation of data communication on the World Wide Web.
HTTP works by establishing a connection between a client and a server, where the client sends a request and the server responds with the requested data.
HTTP uses methods like GET, POST, PUT, DELETE to specify the action to be performed on a res...
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...
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...
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...
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...
ThoughtWorks Application Developer Interview Experiences
26 interviews found
Anonymous
Selected
I appeared for an interview in Aug 2024.
4 coding question easy level questions based on arrays and strings
Code pairing round need to use oops to solve the problem
(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...
- 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...
- Q3. Sql queries on aggregate function
(2 Questions)
- Q1. Gender equality
- Q2. Situation based question
Interview Preparation Tips
Skills evaluated in this interview
Selected
I appeared for an interview in Jan 2025.
Coding plus aptitude
Code pairing round with one question and an hour to solve
(2 Questions)
- Q1. Oops, dsa, java
- Q2. Projesct related
(1 Question)
- Q1. Cultural fit round was kinda HR but more topics involved
Interview Preparation Tips
2 leetcode medium level type problems were given. This was a cut-off test were majority will be cut-off.
Long coding round - Paired with another thoughtworker
(2 Questions)
- Q1. Questions on project
- Q2. Frameworks related
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
Ayush Raj
I applied via Recruitment Consulltant and was interviewed in May 2024. There were 2 interview rounds.
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.
(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 ...
Interview Preparation Tips
- DSA
- OOPS
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
Online hackerrank test
(2 Questions)
- Q1. Code pairing round
- Q2. Solving a problem and improving it
(1 Question)
- Q1. Question on previous experience
(1 Question)
- Q1. Basic HR questions
Interview Preparation Tips
Domain modeling, oops, clean code
(3 Questions)
- Q1. General technical dicussions in resume
- Q2. About project we worked on?
- Q3. LLD system design question
(1 Question)
- Q1. Basic dsa questions would be asked
(1 Question)
- Q1. OOP questions , clean coding
Selected
I applied via Campus Placement and was interviewed before Apr 2023. There was 1 interview round.
(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...
- 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", ...
Skills evaluated in this interview
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ThoughtWorks Interview FAQs
Some of the top questions asked at the ThoughtWorks Application Developer interview -
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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ThoughtWorks Application Developer Reviews and Ratings
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