Regions Bank Interview Questions and Answers

Q1. Group id in kafka consumer configuration
Ans. 
Group id is a unique identifier for a group of consumers in Kafka consumer configuration.
• Group id helps in coordinating the consumption of messages among multiple consumers in a consumer group.

• Each consumer group should have a unique group id to ensure proper message distribution.

• Changing the group id will result in the consumer group starting consumption from the beginning of the topic.

• Group id is specified in the con...read more
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Q2. Recursive algorithm for multiplying 2 numbers
Ans. 
Recursive algorithm for multiplying 2 numbers
• Define a base case for when one of the numbers is 0

• Use recursion to repeatedly add the second number to the result until the first number reaches 0

• Consider handling negative numbers and optimizing for efficiency
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Q3. Spring filters implementation
Ans. 
Spring filters are used to intercept HTTP requests and responses in a Spring application.
• Spring filters can be used for logging, authentication, authorization, etc.

• They are implemented using the javax.servlet.Filter interface.

• Filters can be configured in the web.xml file or using annotations like @WebFilter.

• Example: Implementing a logging filter to log incoming requests and outgoing responses.
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Q4. SQL query for first 5 biggest salaries
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SQL query to retrieve the first 5 biggest salaries from a table
• Use the ORDER BY clause to sort salaries in descending order

• Use the LIMIT clause to limit the results to the first 5 rows
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Q1. How would you build a high performing REST service, that calls a downstream API meant for "Notification" service? [Hint: Async service calls]
Ans. 
To build a high performing REST service for Notification API calls, use asynchronous service calls.
• Use asynchronous programming techniques like CompletableFuture or reactive programming to make non-blocking service calls.

• Implement circuit breakers and timeouts to handle potential failures and prevent cascading failures.

• Optimize the service by tuning thread pools, connection pools, and caching mechanisms.

• Consider using ...read more
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Q2. How would you test your REST API, while the downstream API that you are calling is not ready for test yet? [Hint: Mocks in Mockito]
Ans. 
Use Mockito to create mock objects for downstream API testing.
• Create a mock object using Mockito for the downstream API

• Define the behavior of the mock object to simulate responses

• Inject the mock object into the test environment to simulate the downstream API calls

• Write test cases to verify the functionality of the REST API using the mock object
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Q1. What design pattern you usually used?
Ans. 
I usually use the MVC (Model-View-Controller) design pattern in my projects.
• Separates the application into three main components: Model (data), View (UI), and Controller (logic)

• Promotes code reusability, modularity, and maintainability

• Examples: Laravel framework in PHP, Spring framework in Java
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Q2. What is the difference between array and arraylist
Ans. 
Array is a fixed-size data structure while ArrayList is a dynamic-size data structure in Java.
• Array is a fixed-size collection of elements of the same data type, while ArrayList is a dynamic-size collection that can grow or shrink.

• Arrays can store primitive data types and objects, while ArrayList can only store objects.

• Arrays require a specified size during initialization, while ArrayList can dynamically resize itself.

• ...read more
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Q1. Architecture info
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Q2. Regulatory requirements
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Q1. Projects done so far
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Arthritic and reasoning problems

Q1. Core and relevant tech questions
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Q2. What is push notification and how implemented in android
Ans. 
Push notification is a message that pops up on a mobile device. It can be implemented in Android using Firebase Cloud Messaging (FCM) or Google Cloud Messaging (GCM).
• Push notifications are messages sent from a server to a client app that wakes up the app to inform the user of new messages or events.

• In Android, push notifications can be implemented using Firebase Cloud Messaging (FCM) or Google Cloud Messaging (GCM) API...read more
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Fish and fired fish problems related to DSA

String reverse and count specific character

Q1. Discussion with Manager
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Q2. Core and project env
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