Paytm Payments Bank Interview Questions and Answers

Coding round consisted of three problems with easy to moderate level difficulty.

Q1. Variation of Minimum number of platforms required for railway station.
Ans. 
Minimum number of platforms required for a railway station depends on the maximum number of trains arriving and departing at the same time.
• Calculate the maximum number of trains arriving and departing at the same time.

• Determine the time intervals for each train's arrival and departure.

• Add extra platforms for buffer and unexpected delays.

• Consider factors like train length, frequency, and scheduling conflicts.

• Example: If...read more
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Q2. Rearrange the array such that the negative numbers are shifted to the beginning.
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Q1. Implement a simple program using multithreading.
Ans. 
A simple program using multithreading can be implemented to demonstrate parallel execution of tasks.
• Create a class that implements the Runnable interface in Java.

• Override the run() method to define the task that will run in a separate thread.

• Create instances of the class and start them using the Thread class.

• Use synchronization mechanisms like locks or semaphores to manage shared resources in a thread-safe manner.
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Q2. Explain in details about the Java Collections API.
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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...read more
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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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Q1. What makes you a suitable candidate for this position?
Ans. 
I possess strong sales skills, a proven track record, and a passion for building relationships, making me an ideal candidate for this role.
• Proven track record of exceeding sales targets by 20% in my previous role, demonstrating my ability to drive results.

• Strong communication skills, allowing me to effectively engage with clients and understand their needs, leading to tailored solutions.

• Experience in building long-term...read more
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Q2. What qualifications do you possess that can contribute to the growth of our company?
Ans. 
I possess strong sales skills, industry knowledge, and a customer-centric approach that can drive growth for your company.
• Proven track record in sales: I consistently exceeded sales targets by 20% in my previous role, demonstrating my ability to drive revenue.

• Strong communication skills: I excel in building relationships with clients, which has led to a 30% increase in customer retention for my previous employer.

• Indust...read more
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Q3. Can you provide an overview of your background and experiences?
Ans. 
Dynamic sales professional with 5 years of experience in driving revenue growth and building client relationships.
• 5 years of experience in sales, focusing on B2B and B2C markets.

• Successfully increased sales by 30% in my previous role through targeted marketing strategies.

• Developed strong relationships with clients, resulting in a 90% customer retention rate.

• Skilled in using CRM software to track sales performance and c...read more
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Q1. My sales experience
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Q2. My business experience
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