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Backend Software Engineer Interview Questions

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9,111 backend software engineer interview questions shared by candidates

1. Explain the most technically challenging project that you have worked on. 2. Given a piece of code, with a class having increament and decreament public functions, 2 threads are created which called the respective function, then 2 threads are joined. We need to find the final ouput and make it threadsafe. 3. Multiple reader and single writer problem, reader: multiple reader can read the from the queue/critical section. writer: while writing no other write thread and read thread should be performing the actions. Following 4 functions are given: complete these functions. canRead(){ } readDone(){ } canWrite(){ } writeDone(){ }
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Senior Backend Developer

Interviewed at Hike

3.7★
Nov 4, 2022

1. Explain the most technically challenging project that you have worked on. 2. Given a piece of code, with a class having increament and decreament public functions, 2 threads are created which called the respective function, then 2 threads are joined. We need to find the final ouput and make it threadsafe. 3. Multiple reader and single writer problem, reader: multiple reader can read the from the queue/critical section. writer: while writing no other write thread and read thread should be performing the actions. Following 4 functions are given: complete these functions. canRead(){ } readDone(){ } canWrite(){ } writeDone(){ }

They asked algorithm questions to check my problem solving skills and data structure knowledge. One question was about fill color function. Basically they I asked how can you fill a given grid with the color of the selected pixel. Then they asked me about my favorite data structure and whether I know how it is implemented.
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Backend Developer

Interviewed at Booking.com

4.1★
Dec 15, 2015

They asked algorithm questions to check my problem solving skills and data structure knowledge. One question was about fill color function. Basically they I asked how can you fill a given grid with the color of the selected pixel. Then they asked me about my favorite data structure and whether I know how it is implemented.

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)

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