Box8 Software Developer Intern Interview Questions and Answers

Q1. Use of model in laravel
Ans. 
Models in Laravel are used to interact with the database and represent data.
• Models in Laravel are used to perform database operations such as retrieving, inserting, updating, and deleting data.

• Models help in organizing and structuring the data in the application.

• Models in Laravel follow the MVC (Model-View-Controller) pattern.

• Example: Creating a User model in Laravel to interact with the users table in the database.
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Q2. SQL get highest salary for employee
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Q1. SQL joins and types of joins
Ans. 
SQL joins are used to combine rows from two or more tables based on a related column between them.
• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• INNER JOIN returns rows when there is at least one match in both tables.

• LEFT JOIN returns all rows from the left table and the matched rows from the right table.

• RIGHT JOIN returns all rows from the right table and the matched rows from the left table.

• F...read more
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Q2. What is self join and realted question
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Q1. Previous projects and contributions
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Coding question based on Linked List Arrays

Q1. DSA and DBMS were asked
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Q1. Software development lifecycle
Ans. 
Software development lifecycle is a process of planning, designing, developing, testing, deploying, and maintaining software.
• It involves various stages such as planning, analysis, design, implementation, testing, deployment, and maintenance.

• Each stage has its own set of activities and deliverables.

• It helps in ensuring that the software is developed efficiently and meets the requirements of the stakeholders.

• It also help...read more
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Q2. App security & deployment in play store
Ans. 
App security is crucial for deployment in Play Store. Follow best practices to ensure secure deployment.
• Use HTTPS for all network communication

• Implement secure authentication and authorization mechanisms

• Regularly update and patch the app to fix security vulnerabilities

• Use code obfuscation and encryption to protect against reverse engineering

• Conduct regular security audits and penetration testing

• Follow Google Play Store
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Math Reasoning, Probability, Graph and pie charts, Indices, Trignometry, Geometry

Verbal communication and english speaking, grammer,

Round duration - 90 minutes
Round difficulty - Easy

Q1. 
Cycle Detection in a Directed Graph
Given a directed graph, you need to determine whether or not the graph contains a cycle.
Your function should return true if there is at least one cycle in the graph; ...read more
Ans. 
I used DFS from every unvisited node. There is a cycle in a graph only if there is a back edge present in the graph.
To find the back edge to any of its ancestor keep a visited array and if there is a back edge to any visited node then there is a loop and return true.
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Q2. 
Next Permutation Problem Statement
Given a permutation of ‘N’ integers, rearrange them to generate the lexicographically next greater permutation. A sequence is a permutation if it contains all integers f...read more
Ans. 
Traverse from right and find the first item that is not following the descending order.
Swap the found character with closest greater (or smallest greater) element on right side of it.
After swapping, sort the string after the position of character found.
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Round duration - 60 minutes
Round difficulty - Easy

Q1. 
Validate BST Problem Statement
Given a binary tree with N nodes, determine whether the tree is a Binary Search Tree (BST). If it is a BST, return true; otherwise, return false.
A binary search tree (BST)...read more
Ans. 
I gave him two three approaches.
Brute force
using utility class
using in-order traversal:
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Q1. Basic Php ,Oops
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Q1. Security questions
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Hard difficulty level DSA test, main emphasis on trees and graphs

Q1. Project related questions
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Q2. Questions on Javascript
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Q3. Questions on Core subjects
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