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Lead Backend Developer Interview Questions

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12,381 lead backend developer interview questions shared by candidates

1. Find the Duplicate Number in O(N) time and O(1) space - https://takeuforward.org/data-structure/find-the-duplicate-in-an-array-of-n1-integers/ 2. You have 8 identical cubes, all looks the same except that one of the cube is heavier than others. You also have a traditional weighing scale. Find the heaviest cube in min. No. of steps possible. 3. Write a function which takes a number as an input and returns all possible strings generated from that number. 4. Write a function which takes a n x m matrix as an input and returns the transpose of that matrix. A transpose means converting rows to columns and columns to rows. 5. Java Rapid Fire 6. DSA Rapid fire 7. Rest API Rapid Fire
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SDE-1 Backend Developer

Interviewed at Primathon

4★
Oct 3, 2022

1. Find the Duplicate Number in O(N) time and O(1) space - https://takeuforward.org/data-structure/find-the-duplicate-in-an-array-of-n1-integers/ 2. You have 8 identical cubes, all looks the same except that one of the cube is heavier than others. You also have a traditional weighing scale. Find the heaviest cube in min. No. of steps possible. 3. Write a function which takes a number as an input and returns all possible strings generated from that number. 4. Write a function which takes a n x m matrix as an input and returns the transpose of that matrix. A transpose means converting rows to columns and columns to rows. 5. Java Rapid Fire 6. DSA Rapid fire 7. Rest API Rapid Fire

1. elk stack 2. kafka who is the consumer and who is the producer 3. a store details are not changing and in order to avoid repeated request to database , how java and redis communicate 4. what type of architecture between database and java , jpa vs jdbc , advanatages and use cases difference 5. api gateway? api architecture ? restful vs soap 6. api security spring , 7. how are you authenticating the apis 8. how and where you are storing the logs 9. If someone is doing a man in the middle attach , how will you avoid it .
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Senior Backend Engineer

Interviewed at Decimal Technologies

3.3★
Sep 4, 2023

1. elk stack 2. kafka who is the consumer and who is the producer 3. a store details are not changing and in order to avoid repeated request to database , how java and redis communicate 4. what type of architecture between database and java , jpa vs jdbc , advanatages and use cases difference 5. api gateway? api architecture ? restful vs soap 6. api security spring , 7. how are you authenticating the apis 8. how and where you are storing the logs 9. If someone is doing a man in the middle attach , how will you avoid it .

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