Paytm Software Engineer Interview Questions, Process, and Tips

Q1. Search in a sorted matrix
Ans. 
Search for a target value in a sorted matrix efficiently.
• Start from the top right corner and move left or down based on comparison with target value

• Utilize the sorted nature of the matrix to eliminate certain rows or columns

• Implement binary search for more efficient search in each row or column
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Q2. Rotting orange graph
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Q3. Database Indexing and SQL
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Q1. Design Patterns
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Q2. Medium level Binary tree question
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Q3. Previous work discussion
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1st round was online test with 3 easy-medium leetcode questions

Q1. Quick sort was asked to be implemented
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Q2. Some SQL queries were asked involving joins
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Q1. Standard stack based question -> valid parenthesis
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Q2. Only one question was asked
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Javascript, nodejs, react qustions

Q1. Nodejs event loop
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Q2. React lifecycle , hooks and redux
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Q1. Difference between hashmap and hashtable
Ans. 
HashMap is non-synchronized and allows null values, while Hashtable is synchronized and does not allow null keys or values.
• HashMap is non-synchronized, meaning it is not thread-safe, while Hashtable is synchronized and thread-safe.

• HashMap allows null values and one null key, while Hashtable does not allow null keys or values.

• HashMap is generally preferred for non-thread-safe applications, while Hashtable is used in thr
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Q2. Difference between mongodb and sql
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MongoDB is a NoSQL database while SQL is a relational database management system.
• MongoDB is schema-less, allowing for flexible data models.

• SQL databases use structured query language for defining and manipulating data.

• MongoDB is better suited for unstructured or semi-structured data, while SQL is better for structured data.

• SQL databases are ACID compliant, ensuring data integrity, while MongoDB sacrifices some ACID pro...read more
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