Mindfire Solutions Full Stack Developer Interview Questions and Answers

Round duration - 90 minutes
Round difficulty - Medium

It was a mcq+coding round. There were 2 coding questions of medium difficulty. It was around 3 P.M.

Q1. 
Count Substrings with K Distinct Characters
Given a lowercase string 'STR' and an integer K, the task is to count all possible substrings that consist of exactly K distinct characters. These substrings ar...read more
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Q2. 
Collect Maximum Coins from Matrix
You are provided with a matrix consisting of 'M' rows and 'N' columns. Each cell in this matrix either contains a coin or is empty.
Your task is to collect the maximum n...read more
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Round duration - 90 minutes
Round difficulty - Hard

It was held after the debugging round at around 1 PM. The interviewer briefed me about the problem and then asked me to code in visual studio code.

Q1. 
Optimize Memory Usage Problem Statement
Alex wants to maximize the use of 'K' memory spaces on his computer. He has 'N' different document downloads, each with unique memory usage, and 'M' computer games,...read more
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Round duration - 45 minutes
Round difficulty - Hard

It was immediately after the second interview round. Total 6 students were shortlisted from various colleges for this round. It was at around 4 PM. There were 2 interviewers and asked questions from OS, DBMS, DS and project related questions from resume.

Directions: Each of the following question has a question and two statements labelled as (i) and (ii). Use the data/information given in (i) and (ii) to decide whether the data are sufficient to answer the question record your answer as

A) If you can get the answer from (1)alone but not from (2)
B) If you can get the answer from (2)alone but not from (1)
C) If can get the answer from (1)and (2)together ,although neither statement by itself suffice
D) If statement (1)alone suffices and statement (2) alone also suffice.
E) If can\'t get the answer from statements (1) and (2) together and you need more data.

Copyright protection is given for a work having originality,i.e. it should be from the author and must have minimum degree of creativity. So it is the author who is the real creator of the work thereby first owner of the copyright and Indian law recognizes author as the firstowner of the copyright .But by the term ‘ownership it means it includes not only theauthor ,but also assignee and can even a legal entity even though not defined in the !ct. InBern convention the term !uthor is not defined, instead it says that the person under whose name the work is disclosed, which implies that it is not necessary that always theauthor should be the owner. "owever Indian copyright !ct defines the tern ‘!uthor withrespect to various works, but still leaves some problems. It becomes more comple# in theconte#t of changing technologies, i.e. cinematographic works, sound recording, broadcasting etc which is a combination of different works, also when author does thework in the course of employment. $hen new technologies emerge, different mode of communication simultaneously arise and the e#ploitation of the copyright by wayof assignment %licensing will add economic benefits to the copyright owner and the provisions of assignment and licensing becomes crucial. By amendments Indian Copyright!ct has taken care of such provisions, but still leaving lacunae % the role of &udiciary becomes crucial in interpreting such provisions for effectively protecting the rights of the authors.

What are the constraints and give example that's include all constraints? 2. Basic SQL queries were asked but I don't remember 3. Then asked questions from my college projects

Q1. Why we use public, private and protect
Ans. 
Public, private, and protected are access modifiers used in object-oriented programming to control the visibility of class members.
• Public: allows access to the member from outside the class

• Private: restricts access to the member only within the class

• Protected: allows access to the member within the class and its subclasses
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Q2. Difference between various SQL joins?
Ans. 
SQL joins are used to combine rows from two or more tables based on a related column between them.
• 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.

• FULL JOIN: Returns rows when there is a match in one of the tables.

• C...read more
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Java internals, coding questions 2sum

Q1. Hld of your previous project
Ans. 
Developed a web-based project management tool for tracking tasks and deadlines.
• Used React.js for front-end development

• Implemented RESTful APIs for backend using Node.js and Express

• Utilized MongoDB for database storage

• Incorporated authentication and authorization features for user security
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Q2. Question related to self build projects
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Q1. Salary negotiation
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Q2. Location constrain if any
Ans. 
Open to relocation for the right opportunity
• Willing to relocate for the right job opportunity

• Flexible with location for the right role

• Open to considering different locations for the right position
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Q1. You have worked on which technology
Ans. 
I have worked on technologies such as Java, Python, SQL, and JavaScript.
• Java

• Python

• SQL

• JavaScript
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Q2. What you had implemented
Ans. 
I have implemented various web applications using technologies like HTML, CSS, JavaScript, and React.
• Developed a responsive website for a local business using HTML, CSS, and JavaScript

• Created a single-page application using React for a personal project

• Integrated APIs to fetch and display data dynamically on web pages
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Question on sql , question on maths and logical and technical questions

Q1. Family background
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Q2. Internship done
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Q1. Technical test was easy
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Q2. Encapsulation, Basic questions about c and c++ Software development process
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Q3. Agile methodologies
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General Aptitude Test

Q1. OOPS , Database Questions
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Q1. This round was also same as round 2
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