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.

The exercise of technical interview seemed invented 2 min after interview started. Two interviewers have jumped in without preparing anything. Finally after a wee pause the one of them asked me to provide Scala implementation of a list. When I asked to precise what kind of list he meant, his answer was - immutable linked list.
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Senior Backend Developer

Interviewed at Ledger

3.9
Nov 14, 2018

The exercise of technical interview seemed invented 2 min after interview started. Two interviewers have jumped in without preparing anything. Finally after a wee pause the one of them asked me to provide Scala implementation of a list. When I asked to precise what kind of list he meant, his answer was - immutable linked list.

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