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Worldline Backend Developer Interview Questions and Answers
Worldline Backend Developer Interview Experiences
1 interview found
Anonymous
It was 2 coding ques and computer basics ques
Similar to first with difficulty level high
(4 Questions)
- Q1. Introduction about yourself
- Ans.
I am a backend developer with 5 years of experience in building scalable and efficient web applications.
Experienced in programming languages like Java, Python, and Node.js
Proficient in database management with SQL and NoSQL databases
Familiar with cloud services like AWS and Azure
Strong problem-solving skills and ability to work in a team environment
- Q2. DBMS,ops and SQL ques
- Q3. One simple SQL query
- Q4. Oops implementation
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Interview questions from similar companies
Aditya Kumar
I applied via Company Website and was interviewed before May 2023. There was 1 interview round.
(1 Question)
- Q1. Five advantages of spring boot Which java version you currently use? Features of the java version you use Output from the code Difference between this and super In order to update the string, which will be...
- Ans.
Spring Boot offers advantages like rapid development, easy configuration, embedded servers, production-ready features, and more.
Rapid development: Spring Boot simplifies the setup and configuration of Spring applications, allowing developers to focus on writing business logic.
Easy configuration: Spring Boot provides auto-configuration, reducing the need for manual setup and boilerplate code.
Embedded servers: Spring Boo...
Interview Preparation Tips
- Core Java
- Spring Boot
- Aspect oriented programming
- Design Patterns
- Exception handling
Skills evaluated in this interview
I applied via Instahyre and was interviewed in Jan 2021. There were 5 interview rounds.
Interview Questionnaire
4 Questions
- Q1. Find loop in linked list
- Ans.
To find a loop in a linked list, we use Floyd's cycle-finding algorithm.
Floyd's cycle-finding algorithm uses two pointers, one moving at a rate of one node per iteration and the other moving at a rate of two nodes per iteration.
If there is a loop in the linked list, the two pointers will eventually meet at some node.
To find the starting point of the loop, we reset one of the pointers to the head of the linked list and ...
- Q2. What challenging task you have done
- Q3. System design related question
- Q4. Explain your current project
Interview Preparation Tips
Skills evaluated in this interview
I applied via LinkedIn and was interviewed in Apr 2021. There were 4 interview rounds.
Interview Questionnaire
4 Questions
- Q1. 1. Mininum cost to reach the last cell of a 2D matrix. Required moves are only downward or to the right direction
- Ans.
Minimum cost to reach last cell of 2D matrix with only downward or right moves.
Use dynamic programming approach to solve the problem.
Calculate minimum cost for each cell by considering minimum cost of its adjacent cells.
Final answer will be the minimum cost to reach the last cell.
- Q2. Design a Stack that can support getMin functionality. Whenever it calls getMin on stack it should return the min element in the stack.
- Ans.
Design a stack that supports getMin functionality to return the minimum element in the stack.
Create two stacks, one for storing the actual elements and another for storing the minimum elements.
Push elements onto both stacks simultaneously.
When popping an element, pop from both stacks.
To get the minimum element, peek at the top of the minimum stack.
- Q3. Design a TreeSet functionality
- Ans.
TreeSet is a data structure that stores unique elements in sorted order.
TreeSet is implemented using a Red-Black tree
It provides O(log n) time complexity for basic operations like add, remove, and contains
It also provides methods like first(), last(), headSet(), tailSet(), and subSet()
TreeSet can be used to implement priority queues and sorting algorithms
- Q4. Design a ArrayList that supprorts all the existing funtions of a list plus getMax functionality also.
- Ans.
Design an ArrayList with getMax functionality.
Create a custom ArrayList class that extends the existing ArrayList class.
Add a getMax() method that returns the maximum value in the list.
Override the add() method to keep track of the maximum value in the list.
Update the maximum value whenever an element is added or removed from the list.
Interview Preparation Tips
Skills evaluated in this interview
(2 Questions)
- Q1. Java threads concepts and its usage
- Q2. Data structures problems and design quentions
I applied via Naukri.com and was interviewed in Mar 2024. There was 1 interview round.
-----.geeksforgeeks.org/replace-every-element-with-the-greatest-on-right-side/amp/
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Interview Preparation Tips
- DSA
- Core java
- Design Patterns
- Spring Boot
It was a machine coding round which revolves around designing a simple application primarily on OOPS
(2 Questions)
- Q1. Best time to sell stocks
- Ans.
The best time to sell stocks is when the market is high and the stock has reached its peak value.
Sell when the stock has reached its peak value to maximize profits
Consider selling if the company's fundamentals have changed negatively
Sell if you need to rebalance your portfolio or have reached your financial goals
- Q2. Best time to sell stocks 2
- Ans.
The best time to sell stocks is when the market is at a peak and the stock price is high.
Monitor market trends and stock performance regularly.
Consider selling when the stock reaches a new high or when you have achieved your profit goals.
Sell if there are negative news or events that could impact the stock price negatively.
I applied via Instahyre and was interviewed in Nov 2024. There was 1 interview round.
Machine Coding round on codesignal
Selected
I applied via Recruitment Consulltant and was interviewed in Apr 2024. There were 2 interview rounds.
You should be familiar with core java features. Collections, converting one collection Array / Vector to other. Removing duplicates. Lambda chaining / Functional programming. Basic SQL - Joins, Aggregates etc.
(1 Question)
- Q1. Explain Architecture of applications you worked on. Justify use of components. System Design questions.
Interview Preparation Tips
(1 Question)
- Q1. Diff between react and jQuery
- Ans.
React is a modern JavaScript library for building user interfaces, while jQuery is a fast and concise JavaScript library for DOM manipulation.
React is component-based, promoting reusability and modularity.
React uses a virtual DOM for efficient updates, while jQuery directly manipulates the DOM.
React is declarative, making it easier to reason about the UI, while jQuery is imperative.
React is typically used for single-pa...
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