Juspay Technologies Associate Software Engineer Interview Questions and Answers

3 dsa questions medium level

Q1. 2 medium level dp questions based on string and stocks
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Q2. One hard question based on graph
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Q1. Hr questions and java , springboot questions etc
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Coding and aptitude round

Q1. Tree dsa questions
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Q1. Horse race question
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Q1. Location specific question
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Q1. Internal Implementation of HashMap
Ans. 
HashMap is implemented using an array of linked lists to handle collisions.
• HashMap stores key-value pairs in an array of linked lists

• Hash function is used to determine the index of the array where the key-value pair will be stored

• Collision handling is done by chaining, where multiple key-value pairs with the same hash value are stored in the same linked list

• HashMap allows null keys and values

• HashMap is not synchronized...read more
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3 medium leetcode questions

Q1. Questions of SQL and DBMS 2 DSA questions
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Q2. Valid parentheses in o(1) space
Ans. 
Check if parentheses are valid in constant space
• Use a counter to keep track of open parentheses

• Increment counter for '(' and decrement for ')'

• If counter goes negative or not zero at end, return false
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Q1. Projects and brain stroming
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Q2. Projects were asked in depth
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Q3. Interviewer had good technical knowledge
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Q1. Basic Python Questions Work Exp related discussions
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Q2. Snake and Ladder Problem
Ans. 
Snake and Ladder Problem is a classic board game where players move their tokens based on the roll of a dice.
• The game involves a board with numbered squares, where players move their tokens based on the roll of a dice.

• Snakes and ladders on the board can either help a player advance or set them back.

• The game continues until a player reaches the final square, usually 100, to win.
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Normal array question

Basic android question and Kotlin question

Q1. Asked some puzzles
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Q1. Does Java support pass by reference?
Ans. 
Yes
• Java uses pass by value for all variables, including object references.

• When an object reference is passed as an argument, a copy of the reference is passed, not the actual object.

• Modifying the reference inside the method will not affect the original reference outside the method.

• However, modifications to the object's state inside the method will be visible outside the method.
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Q2. Explain Singleton Pattern
Ans. 
Singleton pattern restricts the instantiation of a class to a single object.
• Singleton pattern ensures that only one instance of a class exists throughout the application.

• It provides a global point of access to the instance.

• Commonly used in scenarios where a single instance needs to coordinate actions across the system.

• Example: Database connection manager, logger, configuration manager.
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