Jio Payments Bank Junior Software Developer Interview Questions and Answers

Q1. Sql basic question and answer
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Q2. Sql all answers
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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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Prepare Ds algo - array, link list, stack, queue. And advance things of your domain

DS apti questions oral

Q1. Ds algo plus your domain discussion. Previous projects
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Finding possible options of moving horse in chess board

Write the polyfill of bind (custom bind)

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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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?
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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
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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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It was a hacker earth test. The questions i had got was weird and the answer was something along the lines of if(num==2) return "y" else return "N"

Q1. Usual leetcode questions
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Q1. Twitter system design
Ans. 
Twitter is a social media platform that allows users to share short messages called tweets.
• Twitter uses a distributed system architecture to handle high traffic and ensure scalability.

• The system consists of multiple servers for different functions such as user authentication, tweet storage, and search indexing.

• Twitter also uses caching and load balancing techniques to improve performance.

• To handle real-time updates, Tw...read more
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Q2. Api design with filters
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API design with filters allows users to retrieve specific data by applying filters to the API request.
• Filters can be applied to different fields in the API request, such as date range, location, or category.

• API design should include clear documentation on available filters and their syntax.

• Filters can be combined to create more complex queries.

• Examples of filter syntax include using operators such as '>', '<', '>=', '<...read more
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There was a Hackerearth test with two questions

Q1. Some standard data structures question on array
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Q2. Standard question on trees
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