Backend Developer Interview Questions

15,489 backend developer interview questions shared by candidates

90 mins. A spring boot hackerrank question. As soon as you log into the hackerrank test. You will get a GitHub URL. You can copy the URL and clone the repository in your local. You have to work on your local machine and keep pushing your commits to the repository. All the necessary POJOs, service implementation, and databases are in place I was asked to implement the following questions: 1. Implement a GET /hotel/{id} to retrieve a hotel by Id 2. Implement a DELETE /hotel/{id} to delete a hotel by Id. (It should not be actually deleted from the system but should be marked as 'deleted') 3. Search all the hotels closest to the city center. /search/{cityId}. The city object has latitude and longitude and the hotel object also has latitude and longitude. The distance between two can be calculated using the haversine formula, (The question says we can use the internet to calculate the haversine formula)
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Software Engineer, Backend

Interviewed at Booking.com

4.1
Jul 23, 2021

90 mins. A spring boot hackerrank question. As soon as you log into the hackerrank test. You will get a GitHub URL. You can copy the URL and clone the repository in your local. You have to work on your local machine and keep pushing your commits to the repository. All the necessary POJOs, service implementation, and databases are in place I was asked to implement the following questions: 1. Implement a GET /hotel/{id} to retrieve a hotel by Id 2. Implement a DELETE /hotel/{id} to delete a hotel by Id. (It should not be actually deleted from the system but should be marked as 'deleted') 3. Search all the hotels closest to the city center. /search/{cityId}. The city object has latitude and longitude and the hotel object also has latitude and longitude. The distance between two can be calculated using the haversine formula, (The question says we can use the internet to calculate the haversine formula)

The values interview questions were all provided beforehand by the internal recruiter, to allow the candidate to prepare answers in advance for each point. The technical interview tasks were also provided beforehand, for the candidate to prepare for, and to allow the candidate to practice both parts if they so desired. The first technical interview task was to domain model for a situation. The second technical interview task was to write the backend ruby code for a different requirement.
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Software Engineer - Backend (Ruby)

Interviewed at Cleo (United Kingdom)

3.4
Nov 2, 2023

The values interview questions were all provided beforehand by the internal recruiter, to allow the candidate to prepare answers in advance for each point. The technical interview tasks were also provided beforehand, for the candidate to prepare for, and to allow the candidate to practice both parts if they so desired. The first technical interview task was to domain model for a situation. The second technical interview task was to write the backend ruby code for a different requirement.

Round2 (Technical 2): This interview supposed to be tougher than the previous one. The interviewer asked me about java fundamental questions. Notes: Look into topics like thread, garbage collection, collections framework. After that, he asked me to design LRU Cache. Was able to do that. Then asked me to implement Priority Queue. Also did that. And that was all for this round.
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Backend Engineer

Interviewed at CleverTap

4.3
Nov 13, 2024

Round2 (Technical 2): This interview supposed to be tougher than the previous one. The interviewer asked me about java fundamental questions. Notes: Look into topics like thread, garbage collection, collections framework. After that, he asked me to design LRU Cache. Was able to do that. Then asked me to implement Priority Queue. Also did that. And that was all for this round.

1. Print all the interleavings between given two strings of length m,n without changing the relative of order of each string. Eg: if str1 = 'AB', m=n, str2 = 'CD', n=2 Then output should be all the interleavings. output: abcd acbd acdb cabd cadb cdab i.e 6 possibilities
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Backend Engineer

Interviewed at Directi

4
Jul 1, 2016

1. Print all the interleavings between given two strings of length m,n without changing the relative of order of each string. Eg: if str1 = 'AB', m=n, str2 = 'CD', n=2 Then output should be all the interleavings. output: abcd acbd acdb cabd cadb cdab i.e 6 possibilities

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