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14,381 backend engineer interview questions shared by candidates

Technical Screening: 1. JVM - Working and Heap 2. Datastructures - Arrays, HashTable, Stack, Queues 3. Time and Space complexity 4. Process and thread - difference and relation 5. Deadlock and concurrency 6. SOLID principles 7. Composition vs Inheritance - Relationship and when to use what 8. CICD - Process 9. Deployment Strategies 10. Minimizing bugs in production 11. Observability and logging - basics like what metrics to check etc. 12. Difference, advantages and disadvantages of Monolith and microservice archs 13. Avoiding cascading failures - Circuit breaker 14. Domain Driven Design 15. Sql vs NoSql - their advantages and disadvantage, when to use what 16. ACID 17. CAP theorem 18. Database scalability - vertical and horizontal scaling
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Backend Developer

Interviewed at Glovo

3.4★
May 13, 2020

Technical Screening: 1. JVM - Working and Heap 2. Datastructures - Arrays, HashTable, Stack, Queues 3. Time and Space complexity 4. Process and thread - difference and relation 5. Deadlock and concurrency 6. SOLID principles 7. Composition vs Inheritance - Relationship and when to use what 8. CICD - Process 9. Deployment Strategies 10. Minimizing bugs in production 11. Observability and logging - basics like what metrics to check etc. 12. Difference, advantages and disadvantages of Monolith and microservice archs 13. Avoiding cascading failures - Circuit breaker 14. Domain Driven Design 15. Sql vs NoSql - their advantages and disadvantage, when to use what 16. ACID 17. CAP theorem 18. Database scalability - vertical and horizontal scaling

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)

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.

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