Bluestream Software Solution Software Developer Interview Questions and Answers

Test will be in hacker rank there would be a difficulty level between easy to medium

Q1. Question will be from data structure and easy to medium level of the programming laanguage question
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Q1. This is just to check your english ability
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Q1. Basic Java Question
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Q2. Spring Boot related questions
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Q1. Design a rest API and code it.
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Design and code a REST API for a software developer interview.
• Define the endpoints and HTTP methods for the API (e.g. GET /users, POST /users)

• Implement authentication and authorization mechanisms (e.g. JWT tokens)

• Use proper status codes for responses (e.g. 200 OK, 401 Unauthorized)

• Include error handling and validation for input data

• Document the API using tools like Swagger or OpenAPI
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Q2. Questions related to JPA HIBERNATE SQL
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Q1. Discussion related to Last company Project and architecture level questions
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Q2. Write code to calculate frequency of a word using Stream API and lambda expressions
Ans. 
Calculate word frequency using Stream API and lambda expressions
• Use Stream API to convert array of strings to stream

• Use Collectors.groupingBy to group words by their frequency

• Use Collectors.counting to count the occurrences of each word
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DSA questions and programming concepts

Q1. Reverse string and optimize it
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Reverse array of strings efficiently
• Use two pointers approach to swap characters from start and end of each string

• Optimize by using in-place reversal instead of creating new strings

• Consider edge cases like empty strings or strings with only one character
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Q2. Reverse binary tree
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Q1. Salary expectations
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Q2. Joining location
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Q1. WRITE A java program to find the shortest distance between 2 nodes in an array
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Java program to find shortest distance between 2 nodes in an array of strings
• Create a method that takes in the array of strings and the two nodes as parameters

• Use a map to store the index of each node in the array

• Calculate the distance between the two nodes using their indices in the array
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Q2. Explain oops concept
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OOPs concept is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.
• OOPs stands for Object-Oriented Programming

• Key concepts include classes, objects, inheritance, polymorphism, and encapsulation

• Classes are blueprints for creating objects, which are instances of classes

• Inheritance allows a class to inherit properties and behavior from an...read more
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Q1. Salary discussion
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Q2. Location process
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Q1. What is Concrete class ?
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Q1. OS questions,graph dfs question, geeks for geeks chocolate factory question
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Q1. Children sum property trees,height of BT
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The question is about implementing a children sum property in trees and finding the height of a binary tree.
• Children sum property in trees means that the value of a node must be equal to the sum of the values of its children nodes.

• To find the height of a binary tree, you can recursively calculate the height of the left and right subtrees and return the maximum height plus one.

• Example: For a binary tree with nodes 1, 2,
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Q1. Internal working of Hash Map
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Hash Map is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.
• Hash Map uses a hash function to determine the index of the key-value pair in the underlying array.

• Collisions can occur when multiple keys hash to the same index, which can be resolved using techniques like chaining or open addressing.

• Hash Map typically has a load factor threshold to determine whe...read more
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Q1. Project amd Advanced C++ concepts
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C++ coding questions and logical questions