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Design a very simple URL shortener in Java: in-memory storage is fine, up to 100 URLs, only two methods (shorten and get/unshortnen), thread-safe (preferably in TDD style, but I was not following it strictly, and there was nothing on it in the feedback afterwards). Afterwards there as a small discussion on how to improve the design, whether it's thread-safe, about the test cases and so on.
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Backend Engineer

Interviewed at Revolut

4★
Dec 4, 2024

Design a very simple URL shortener in Java: in-memory storage is fine, up to 100 URLs, only two methods (shorten and get/unshortnen), thread-safe (preferably in TDD style, but I was not following it strictly, and there was nothing on it in the feedback afterwards). Afterwards there as a small discussion on how to improve the design, whether it's thread-safe, about the test cases and so on.

Coding question: I was given a sorted (by date) list L1 of Tuple2. Each Tuple2 contains Role and Date this Role is activated. Also I was given a list L2 of Dates. The task is to print Role from L1 by Date in L2. SQL question: Do that role finding but through an SQL query on a database were the lists are tables (and are not necessarily sorted) feature design: Design the feature of surveys with 2 different types of questions. (Focused on structuring the data in the code and in the DB)
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Backend Engineer

Interviewed at HiBob

4.4★
Jan 13, 2025

Coding question: I was given a sorted (by date) list L1 of Tuple2. Each Tuple2 contains Role and Date this Role is activated. Also I was given a list L2 of Dates. The task is to print Role from L1 by Date in L2. SQL question: Do that role finding but through an SQL query on a database were the lists are tables (and are not necessarily sorted) feature design: Design the feature of surveys with 2 different types of questions. (Focused on structuring the data in the code and in the DB)

They asked me to write a function that checks if a meeting room is occupied. There is a class and a function that receives a list of rooms and the number of people each room can accommodate and returns the smallest available room for the given date.
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Backend Developer

Interviewed at HiBob

4.4★
Mar 2, 2025

They asked me to write a function that checks if a meeting room is occupied. There is a class and a function that receives a list of rooms and the number of people each room can accommodate and returns the smallest available room for the given date.

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