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Ingeniero Java Senior Interview Questions

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Live coding + some questions about complexity of the solution. Load balancer. Some extra requirements once you implement the previous ones. Money transfer service, then SQL query of money transfer, then theory about DB mostly (ACID, isolation levels).
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Senior Java Developer

Interviewed at Revolut

4★
Aug 28, 2025

Live coding + some questions about complexity of the solution. Load balancer. Some extra requirements once you implement the previous ones. Money transfer service, then SQL query of money transfer, then theory about DB mostly (ACID, isolation levels).

Ways of creating thread. When to use runnable and when to use Thread. Abstract Class Instantiation of Abstract class Singleton classes Where singleton design can break? Custom class object as key in hashmap Identity hashmaps---equality is done using reference (==) Concurrent hashmaps--contains segments--1Sements = 1 Hasmap(Conceptually) Final class
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Senior Java Developer

Interviewed at Capgemini

4.1★
Jul 20, 2025

Ways of creating thread. When to use runnable and when to use Thread. Abstract Class Instantiation of Abstract class Singleton classes Where singleton design can break? Custom class object as key in hashmap Identity hashmaps---equality is done using reference (==) Concurrent hashmaps--contains segments--1Sements = 1 Hasmap(Conceptually) Final class

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