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9,176 backend developer interview questions shared by candidates

Technical screening questions 1) Check if two strings are anagrams 2) resume walk through ( Like diff between hibernate and jpa) 3) questions on log4j 4) Was given a sample code for finiding prime numbers between 1 to n . IT was technically right but was asked to follow best coding practices and improve it like java docs, comments, variable naming etc Virtual onsite Interview Round 1 question 1) What is singleton design pattern. 2) Have you used microservices before ? Please explain from you work experience. Coding question : I was given some boiler plate code. I was asked to design Object oriented design of twitter. Like 1) Posting tweets 2) Following users 3) Unfollowing users. 4) Generating timeline. These were the 4 methods they asked me to write code for. I have used Maps to do this. You do not need to use any databases or tables. You can use any inmemory data structures and get this done. Round -2 1) I was asked to construct a binary search tree from a given list of Integers. 2) I was asked how would i implement this for an List of objects and are needed to be sorted based on a field in an object.( This can be done with generics) 3) I was also asked to use compareTo() to achieve this. Third round 1) I was asked to write code to print a pascal triangle in console 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 etc Round 4: Situational and behavioral questions were asked.
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Backend Software Engineer

Interviewed at PayPal

3.6★
Mar 4, 2021

Technical screening questions 1) Check if two strings are anagrams 2) resume walk through ( Like diff between hibernate and jpa) 3) questions on log4j 4) Was given a sample code for finiding prime numbers between 1 to n . IT was technically right but was asked to follow best coding practices and improve it like java docs, comments, variable naming etc Virtual onsite Interview Round 1 question 1) What is singleton design pattern. 2) Have you used microservices before ? Please explain from you work experience. Coding question : I was given some boiler plate code. I was asked to design Object oriented design of twitter. Like 1) Posting tweets 2) Following users 3) Unfollowing users. 4) Generating timeline. These were the 4 methods they asked me to write code for. I have used Maps to do this. You do not need to use any databases or tables. You can use any inmemory data structures and get this done. Round -2 1) I was asked to construct a binary search tree from a given list of Integers. 2) I was asked how would i implement this for an List of objects and are needed to be sorted based on a field in an object.( This can be done with generics) 3) I was also asked to use compareTo() to achieve this. Third round 1) I was asked to write code to print a pascal triangle in console 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 etc Round 4: Situational and behavioral questions were asked.

Alphabetically ordered books fell off the shelf. And some of them from the front got arranged in non alphabetical order. Write an algorithm which will tell how many books would need to be moved to put books back in order. Describe complexity
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Backend Developer

Interviewed at Plooto

3.5★
Oct 1, 2024

Alphabetically ordered books fell off the shelf. And some of them from the front got arranged in non alphabetical order. Write an algorithm which will tell how many books would need to be moved to put books back in order. Describe complexity

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