Carrefour SDE (Software Development Engineer) Interview Questions and Answers

2 DSA questions and some MCQ on Java and Spring

Q1. Longest palindromic substring
Ans. 
A palindromic substring is a string that reads the same forwards and backwards.
• Use dynamic programming to find the longest palindromic substring.

• Start by considering each character as the center of a potential palindrome.

• Expand outwards from each center to check for palindromes of odd and even lengths.
Answered by AI
Add your answer
Q2. Remove duplicates in place from a 1D array
Ans. 
Remove duplicates from a 1D array of strings in place
• Iterate through the array and use a HashSet to keep track of unique elements

• Replace duplicates with null or an empty string to remove them in place
Answered by AI
Add your answer

Q1. Project discussion
Add your answer
Q2. Search min element in a rotated sorted array with duplicate elements
Ans. 
Search for the minimum element in a rotated sorted array with duplicate elements.
• Use binary search to find the minimum element in the rotated sorted array.

• Handle the case where duplicate elements are present by adjusting the search conditions.

• Consider cases where the array is not rotated or contains only one element.
Answered by AI
Add your answer
Q3. Ways of declaring singleton class
Ans. 
A singleton class is a class that can only have one instance created throughout the application.
• Declare a private static instance variable of the class

• Create a private constructor to prevent external instantiation

• Provide a public static method to access the instance
Answered by AI
Add your answer

Q1. Project discussion
Add your answer
Q2. Behavioural questions
Add your answer

Q1. Scenerio based questions
Add your answer

Q1. Problem solving
Add your answer
Q2. Basic js question
Add your answer

System design - ecommers website and project related

Js + react js questions

Q1. Explain about spring boot
Ans. 
Spring Boot is a framework that simplifies the development of Java applications by providing pre-configured settings and tools.
• Spring Boot eliminates the need for manual configuration by providing defaults for most settings.

• It allows for standalone Spring applications that can be started using a simple 'java -jar' command.

• Spring Boot includes embedded servers like Tomcat, Jetty, or Undertow for deploying applications.

• I...read more
Answered by AI
Add your answer

They asked questions on data structure , programming puzzles and multiple use cases

Q1. C# OOPS related questions, Design Patterns and simple coding questions such as Fizz Buzz and Palindrome for which I had to share my screen code and run the solution and explain the Time & Space complexity ...read more
Add your answer

Q1. Very Easy Technical round with a panel of 3 from US in which easy coding questions on List etc were asked to program and run on an online compiler
Add your answer

Q1. Director Round with an Indian guy sitting in US - How to do central logging in a multi server setup? I answered by saying we can use AWS Cloudwatch to achieve this for monitoring analysis & logging or we c...read more
Add your answer

Q1. Had two HR rounds - They said that they cannot give the salary which I had initially shared with them as my expected salary. If that was the case then why waste someone's time, they could have told me this...read more
Add your answer

Q1. Asked data structures and algorithms in 1st round
Add your answer

Q1. Spring boot core Java microservices algo lld hld
Add your answer

Q1. Hld for ticket management ..like ticket management in Zomato
Add your answer

Q1. Sal negotiation + basic communication skills
Add your answer

Q1. System Design Questions, Situation based problems of system design
Add your answer
Q2. Data Structure Coding question of HashMap
Add your answer

Q1. Again System design, Question from your project and architecture of your project
Add your answer