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15,496 lead backend developer interview questions shared by candidates

Question: Can you explain how a relational database differs from a NoSQL database? How did you answer (optional): I explained that relational databases use structured tables and enforce schemas with SQL, while NoSQL databases are schema-less, support flexible document/column storage, and scale horizontally. Question: Write a function to reverse a string without using built-in methods. How did you answer: I wrote a simple loop to swap characters from both ends until the middle of the string. Question: What are the main differences between GET and POST in HTTP? How did you answer: GET is idempotent, used for retrieving data, and parameters are visible in the URL. POST is used for sending data securely in the request body.
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Backend Developer

Interviewed at Vijaya Diagnostic Centre

3.6★
Sep 2, 2025

Question: Can you explain how a relational database differs from a NoSQL database? How did you answer (optional): I explained that relational databases use structured tables and enforce schemas with SQL, while NoSQL databases are schema-less, support flexible document/column storage, and scale horizontally. Question: Write a function to reverse a string without using built-in methods. How did you answer: I wrote a simple loop to swap characters from both ends until the middle of the string. Question: What are the main differences between GET and POST in HTTP? How did you answer: GET is idempotent, used for retrieving data, and parameters are visible in the URL. POST is used for sending data securely in the request body.

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