Backend Engineer Interview Questions

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Circuit breaker implementation in Java: The service A calls service B and service C every time. If one service fails 3-times in 10 minutes ( or 20 seconds in the implementation) the next call will be blocked for 5 minutes (10 seconds in the implementation). There was given a simulation of remote method calls, I needed to implement only the execute() which calls the remote service if possible.
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Senior Backend Java Engineer

Interviewed at Wise

3.7
Feb 19, 2026

Circuit breaker implementation in Java: The service A calls service B and service C every time. If one service fails 3-times in 10 minutes ( or 20 seconds in the implementation) the next call will be blocked for 5 minutes (10 seconds in the implementation). There was given a simulation of remote method calls, I needed to implement only the execute() which calls the remote service if possible.

Online assessment: 5 problems - 2 leetcode hards, 1 relatively easy SQL query, 1 refactor-a-class problem and 1 design problem Technical interview: How do you create a bean? No, I don't mean that. How do you create the bean? What type of bean is it? That's not what scope means (it actually is). Ok, and how does Spring do that in the back? Tell me the implementation.
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Backend Developer

Interviewed at ING

4.1
Oct 12, 2022

Online assessment: 5 problems - 2 leetcode hards, 1 relatively easy SQL query, 1 refactor-a-class problem and 1 design problem Technical interview: How do you create a bean? No, I don't mean that. How do you create the bean? What type of bean is it? That's not what scope means (it actually is). Ok, and how does Spring do that in the back? Tell me the implementation.

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