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Software Developer 2 Interview Questions

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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-2

Interviewed at PayPal

3.6★
Mar 4, 2021

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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