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Sviluppatore Software Java Interview Questions

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4,317 sviluppatore software java interview questions shared by candidates

OOP & Code Review Round: I was presented with a large, buggy codebase and asked to review it live in an IDE. The focus was on identifying anti-patterns, code smells, and suggesting improvements and bug fixes. No actual coding was required—only live commenting and feedback on the existing implementation.
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Java Software Engineer

Interviewed at Squarespace

3.6★
Apr 10, 2025

OOP & Code Review Round: I was presented with a large, buggy codebase and asked to review it live in an IDE. The focus was on identifying anti-patterns, code smells, and suggesting improvements and bug fixes. No actual coding was required—only live commenting and feedback on the existing implementation.

They asked In-depth java concepts and Micro services . if(null==null){ do }else{ do } this was one of the question and one more how can we use @Transactional in microservices which are inter conntected to each other how will you roll back the changes if exception occurs
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Software Engineer - Java Developer

Interviewed at Inspire Brands

3.1★
Jun 26, 2024

They asked In-depth java concepts and Micro services . if(null==null){ do }else{ do } this was one of the question and one more how can we use @Transactional in microservices which are inter conntected to each other how will you roll back the changes if exception occurs

1. I have a java program in which there are a lot of HashMap/HashTable being used for mapping key-value pairs. Now I want to profile or rather count how many times the get() and put() methods have been called in my program. 2. Given a stream of integers and asked to store N uniques numbers performing insert, search, retrieve in O(1) complexity. If the maximum space reached remove the old data and insert the new data. Perform the above using a data structure. 3. Given a number N. write a program to find the number of prime numbers in the range of 1 to N.
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Java Software Engineer Test

Interviewed at Coupang

3.3★
Aug 26, 2016

1. I have a java program in which there are a lot of HashMap/HashTable being used for mapping key-value pairs. Now I want to profile or rather count how many times the get() and put() methods have been called in my program. 2. Given a stream of integers and asked to store N uniques numbers performing insert, search, retrieve in O(1) complexity. If the maximum space reached remove the old data and insert the new data. Perform the above using a data structure. 3. Given a number N. write a program to find the number of prime numbers in the range of 1 to N.

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