nference Full Stack Developer Interview Questions and Answers

Q1. What are Callbacks ?
Ans. 
Callbacks are functions passed as arguments to other functions, to be executed later.
• Callbacks are commonly used in asynchronous programming to handle events or responses.

• They allow for functions to be executed after another function has finished.

• Callbacks can be used to achieve better modularity and reusability in code.

• Example: setTimeout function in JavaScript takes a callback function as an argument to be executed a
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Q2. Some backend questions
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Q1. Explain primary key in dbms
Ans. 
Primary key is a unique identifier for each record in a database table.
• Primary key ensures data integrity and helps in faster data retrieval.

• It cannot have null values and must be unique for each record.

• It can be a single column or a combination of columns.

• Examples of primary keys are social security number, email address, etc.
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Q2. Memory management concept names in os
Ans. 
Memory management concepts in OS
• Virtual memory

• Page replacement algorithms

• Memory allocation

• Memory protection

• Swapping

• Fragmentation
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Round duration - 50 Minutes
Round difficulty - Medium

Round 2 was a technical interview conducted on Google meet. The interviewer was so much friendly.

Introduce yourself.
Explain your project (as it was mentioned in my resume).
Asked a few questions about my projects, I answered all of them, and he appreciated that.
Questions on os cn dbms and oops followed by 2 data structures problem
Also questions about javascript, typescript, css and html.

Q1. 
Find Indices for Local Minima and Maxima
Given an integer array arr of size N, your task is to determine all indices of local minima and local maxima within the array. Return these indices in a 2-D list, ...read more
Ans. 
The task is to find and return the indices of local minima and local maxima in the given array.
• Iterate through the array and compare each element with its neighbors to determine if it is a local minima or maxima.

• Consider corner elements separately by comparing them with only one neighbor.

• Store the indices of local minima and maxima in separate lists.

• If there are no local minima or maxima, return -1 as the only row elem
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Q2. 
Rotational Equivalence of Strings Problem Statement
Given two strings 'P' and 'Q' of equal length, determine if string 'P' can be transformed into string 'Q' by cyclically rotating it to the right any num...read more
Ans. 
The task is to check if one string can be converted into another string by cyclically rotating it to the right any number of times.
• Check if the lengths of the two strings are equal. If not, return 0.

• Concatenate the first string with itself and check if the second string is a substring of the concatenated string.

• If the second string is a substring, return 1. Otherwise, return 0.
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Round duration - 50 Minutes
Round difficulty - Medium

I was asked to explain my project and the difficulties I faced while implementing it followed by 2 coding questions.
Interviewer was very senior this time but helped me a lot during the process. Asked some sql queries like to find count of the books by their category had to use group by.

Q1. 
Minimum Jumps Problem Statement
Bob and his wife are in the famous 'Arcade' mall in the city of Berland. This mall has a unique way of moving between shops using trampolines. Each shop is laid out in a st...read more
Ans. 
This question asks for the minimum number of trampoline jumps a person needs to make in order to reach the last shop in a mall.
• The shops in the mall are laid out in a straight line and each shop has a constant value representing the maximum distance it can be jumped to.

• The person starts at shop 0 and wants to reach the last shop, shop N-1.

• If it is impossible to reach the last shop, the function should return -1.

• The fun...read more
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Round duration - 20 Minutes
Round difficulty - Easy

Asked me Tell me something about myself. She also described the way ZopSmart does business.

Basic Logical programs

Q1. Explain laravel Structure
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Q2. Database migration
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Q3. What is indexing in database
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Q4. What is controller ,What is Route
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Q1. Why you leave your previous Company
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Q2. What is your role in previous company
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Java, spring,springboot

Logical reasoning, problem solving

Q1. Tell me about your self
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Q2. Family background
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2 Query question and 3 coding questions

Q1. Basic oops , Java script and Networking questions.
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Q2. What is object orienteered programming.
Ans. 
Object oriented programming is a programming paradigm based on the concept of objects, which can contain data and code.
• Objects are instances of classes, which define the structure and behavior of the objects.

• Encapsulation, inheritance, and polymorphism are key principles of object oriented programming.

• Example: Java, C++, Python are popular languages that support object oriented programming.
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Q3. Different Events in java script
Ans. 
Events in JavaScript are actions or occurrences that happen in the browser that the code can respond to.
• Events can be triggered by user actions (like clicking a button), browser actions (like page load), or system events (like a timer expiring)

• Event listeners are used to listen for and respond to events

• Common events include click, mouseover, keydown, submit, etc.
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Q4. Event listeners
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Project , coding question, DBMS

Q1. Basic personal details
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2 DSA questions Both are from DP

Q1. 2 Questions , 1 is DSA
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Q2. Second question is Puzzle
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