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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.

1. Tell about a project you did and how was implemented. 2. Given a String comprised out of all the chars possible (the string isn't necessarily long, but can contain all char types), return the number of removeLetter actions that would result in the input string to be valid. I'll explain: A "Valid String" is a string that each unique char in it has a count (number of appearances) which is a unique number. For example: given "abcaba", it's valid because 'a' appears 3 times, 'b' appears 2 times and 'c' appears once. In the contrary, "aabb" isn't valid because both 'a' & 'b' appears 2 times in the string. So the question is: implement a method in your lang, that would return the number of remove-letter actions that would convert an invalid string to a valid string. Given "aabb", the function will return 1 (because we can remove 'a' or 'b' and by that making the string valid).

Senior Backend Engineer

Interviewed at Cornix 10

May 30, 2023

1. Tell about a project you did and how was implemented. 2. Given a String comprised out of all the chars possible (the string isn't necessarily long, but can contain all char types), return the number of removeLetter actions that would result in the input string to be valid. I'll explain: A "Valid String" is a string that each unique char in it has a count (number of appearances) which is a unique number. For example: given "abcaba", it's valid because 'a' appears 3 times, 'b' appears 2 times and 'c' appears once. In the contrary, "aabb" isn't valid because both 'a' & 'b' appears 2 times in the string. So the question is: implement a method in your lang, that would return the number of remove-letter actions that would convert an invalid string to a valid string. Given "aabb", the function will return 1 (because we can remove 'a' or 'b' and by that making the string valid).

- What is clean code for you (They dont accept non-repeated code as an answer, they said it can happen sometimes due to business requirements, yes team leader said this exactly :) ) - What is transactional annotation in Spring, and what are the details of it - Just some other details about the annotations of Spring, I dont know why :)
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Senior Backend Engineer

Interviewed at Getir

3.2★
Mar 12, 2022

- What is clean code for you (They dont accept non-repeated code as an answer, they said it can happen sometimes due to business requirements, yes team leader said this exactly :) ) - What is transactional annotation in Spring, and what are the details of it - Just some other details about the annotations of Spring, I dont know why :)

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