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

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.
Ans. 
Rearrange array with negative numbers at the beginning
• Iterate through the array and move negative numbers to the beginning

• Use two pointers approach to swap elements

• Maintain the order of negative numbers while shifting them 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.
Ans. 
Java Collections API provides a set of classes and interfaces to store and manipulate collections of objects.
• Includes interfaces like List, Set, and Map for different types of collections

• Provides classes like ArrayList, HashSet, and HashMap for implementing collections

• Offers utility classes like Collections for common operations on collections

• Introduced in Java 2 and has been expanded in subsequent versions
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Leetcode medium questions using priority queue. I don't remeber exact now

Q1. Interview round was vry simple binary tree mirror question
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Q1. 5 mins round. basics like location
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Q1. Resume based+ DSA + Riddles
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3 Coding problems to be solved in 90 minutes.

Q1. Introduction, Project Discussion, HTML Tags, Reverse a string, Level order traversal in a binary tree, Minimum swap operations to sort an array.
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Q1. N-Queen problem, Coin Change, Number of Islands
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Leetcode medium 2 question in 60 minutes.

Leet code hard 1 question

Q1. Design a hashmap and internal working .. then few questions on linked hashmap
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Q2. Assignment to make a snake and ladder
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