Paytm Payments Bank Senior Software Engineer Interview Questions, Process, and Tips

2 leetcode problem
1. house robbers
2. Reverse linkedlist

Q1. Difference between qualifier and auto wired?
Ans. 
Qualifier is used to specify which bean to autowire, while Autowired is used to automatically wire the bean.
• Qualifier is used to resolve ambiguity when multiple beans of the same type are present in the context.

• Autowired is used to automatically inject the dependency by type.

• Qualifier is used in conjunction with Autowired to specify the bean to be injected.
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Q2. Abstract vs interface?
Ans. 
Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.
• Abstract classes can have constructors, fields, and non-abstract methods.

• Interfaces can only have abstract methods and constants.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Example: Abstract class - Animal with abstract method 'eat', Interface - Flyable with method
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Q3. Exception handling in polymorphism
Ans. 
Exception handling in polymorphism involves handling exceptions that may occur in overridden methods.
• In polymorphism, a subclass method can override a superclass method, including exception handling.

• Subclass methods can throw exceptions that are subclasses of the exceptions thrown by the superclass method.

• When calling a method on a superclass reference that points to a subclass object, the subclass method's exception h...read more
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Q1. WhatsApp notification system design
Ans. 
Design a notification system for WhatsApp
• Use push notifications for real-time updates

• Implement message queue for reliable delivery

• Allow users to customize notification settings

• Utilize web sockets for instant messaging

• Consider implementing read receipts for messages
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Basic to Medium level questions on DSA

Q1. Java Design Patterns
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Q2. Backend Development and Scalability
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Basic to Medium Coding Questions based on Array, LinkedList and HashMap

Q1. Java Design Patterns
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Q2. Backend and Scalability
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It was a DSA round. Meduim level leetcode problems

Q1. It was leetcode medium level problem
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