BNY Fullstack Java Developer Interview Questions and Answers for Experienced

Q1. Questions related to backend and AWS.
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Q1. Question related to front end and database.
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Q1. Past Experience
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Q2. About project, Java Concepts, Spring boot concepts, Cloud questions and one coding question
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Q1. What are the various methods to implement pagination using ReactJS, and what are the best practices to enhance performance on the user interface?
Ans. 
Explore methods for implementing pagination in ReactJS and best practices for UI performance enhancement.
• 1. Client-Side Pagination: Load all data at once and paginate on the client side using libraries like 'react-paginate'.

• 2. Server-Side Pagination: Fetch data in chunks from the server based on the current page, reducing initial load time.

• 3. Infinite Scrolling: Load more data as the user scrolls down, using libraries ...read more
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Q2. What are the Java design patterns utilized in your current project?
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Q3. What is the process for deploying a Spring Boot application on AWS S3?
Ans. 
Deploying a Spring Boot application on AWS S3 involves packaging, configuring, and uploading the application to S3.
• Package the Spring Boot application as a JAR or WAR file using Maven or Gradle.

• Create an S3 bucket in the AWS Management Console to store the application.

• Upload the packaged JAR/WAR file to the S3 bucket using the console or AWS CLI.

• Set appropriate permissions for the S3 bucket to allow public access if ne...read more
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Q1. Be well prepared for technical round as this will be a make or break for you
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Round duration - 90 minutes
Round difficulty - Medium

It was a cumulative test

Q1. 
Trapping Rainwater Problem Statement
You are given an array ARR of long type, which represents an elevation map where ARR[i] denotes the elevation of the ith bar. Calculate the total amount of rainwater t...read more
Ans. 
Calculate the total amount of rainwater that can be trapped within given elevation map.
• Iterate through the array to find the maximum height on the left and right of each bar.

• Calculate the amount of water that can be trapped above each bar by taking the minimum of the maximum heights on the left and right.

• Sum up the trapped water above each bar to get the total trapped water for the elevation map.
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Round duration - 90 minutes
Round difficulty - Medium

It was sophisticated in nature and a good brain buster.

Q1. 
Candies Distribution Problem Statement
Prateek is a kindergarten teacher with a mission to distribute candies to students based on their performance. Each student must get at least one candy, and if two s...read more
Ans. 
Determine the minimum number of candies needed to distribute to students based on their performance and ratings.
• Iterate through the array of student ratings and assign 1 candy to each student initially.

• Then iterate from left to right and check if the current student's rating is higher than the previous student, if so, assign candies accordingly.

• Similarly, iterate from right to left to handle cases where the current stu...read more
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Round duration - 1 hour
Round difficulty - Medium

Q1. DBMS
It revolved around basic concepts
Ans. 
DBMS is a software system that manages databases and allows users to interact with data stored in them.
• DBMS stands for Database Management System

• It helps in creating, updating, and managing databases

• Examples of DBMS include MySQL, Oracle, SQL Server

• It ensures data integrity, security, and efficient retrieval
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Round duration - 70 minutes
Round difficulty - Hard

It was a great experience