Lead Backend Developer Interview Questions

9,386 lead backend developer interview questions shared by candidates

1. can there be 2 objects with the same hash code? 2. explain and implement any design pattern that is not Singelton 3. run time for searching a value in an array, in a hash map. 4. jave code that contains a Pariority Queue and Comperator and asking about the output of the code. 5. java code about 2 threads that one of them adds values to an Arraylist and the other one iterates that same Arraylist using iterator. which runtime errors would there be? how would you fix it?
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Backend Developer

Interviewed at SysAid

3.7
Dec 5, 2018

1. can there be 2 objects with the same hash code? 2. explain and implement any design pattern that is not Singelton 3. run time for searching a value in an array, in a hash map. 4. jave code that contains a Pariority Queue and Comperator and asking about the output of the code. 5. java code about 2 threads that one of them adds values to an Arraylist and the other one iterates that same Arraylist using iterator. which runtime errors would there be? how would you fix it?

Round 1: Coding Questions: Question 1: An easy string problem based on string matching. Question 2: A slightly tricky problem, "Zigzag Conversion" from LeetCode. Conceptual Questions: DBMS: Explain ACID properties. What is the difference between DROP, TRUNCATE, and DELETE commands? OOP: What is polymorphism? Explain static and dynamic binding. General: Difference between CHAR and VARCHAR. Round 2: Project Discussion: A detailed discussion about my projects. Coding Question: "LRU Cache" from LeetCode.

Backend Developer Intern

Interviewed at Tata 1mg

3.1
Dec 21, 2024

Round 1: Coding Questions: Question 1: An easy string problem based on string matching. Question 2: A slightly tricky problem, "Zigzag Conversion" from LeetCode. Conceptual Questions: DBMS: Explain ACID properties. What is the difference between DROP, TRUNCATE, and DELETE commands? OOP: What is polymorphism? Explain static and dynamic binding. General: Difference between CHAR and VARCHAR. Round 2: Project Discussion: A detailed discussion about my projects. Coding Question: "LRU Cache" from LeetCode.

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