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.
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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
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Q1. Project discussion
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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.
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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
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Q1. Project discussion
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Q2. Behavioural questions
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Basic questions were aksed and feedback about their product

Q1. Coding questions were asked
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Q2. Project related questions were asked
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Q1. Scenerio based questions
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Q1. Problem solving
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Q2. Basic js question
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System design - ecommers website and project related

Js + react js questions

Q1. Explain about spring boot
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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
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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
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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
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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
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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
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Q1. Asked data structures and algorithms in 1st round
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Q1. Spring boot core Java microservices algo lld hld
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Q1. Hld for ticket management ..like ticket management in Zomato
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Q1. Sal negotiation + basic communication skills
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Q1. System Design Questions, Situation based problems of system design
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Q2. Data Structure Coding question of HashMap
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Q1. Again System design, Question from your project and architecture of your project
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