Sequretek It Solutions Software Developer Interview Questions and Answers

Q1. What are React Queries?
Ans. 
React Queries are a library for managing server state in React applications.
• React Queries provide a way to fetch and cache data from an API in React components.

• They offer features like caching, background fetching, and automatic refetching.

• React Queries can handle complex data fetching requirements, such as pagination and infinite scrolling.
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Q2. Can useEffect() hook run twice?
Ans. 
Yes, useEffect() hook can run twice under certain conditions.
• useEffect() hook can run twice if the dependencies array changes between renders.

• This can happen if the dependencies array contains values that change frequently.

• For example, if a state variable is included in the dependencies array and it is updated in the component, useEffect() will run again.
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Building small UI screen application in 1 hr for frontend developer

Q1. Graph traversal question
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Q2. React js questions
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Q3. Javascript output guessing question
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Personal information, qualification,working or not

Q1. Job related questions
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Q2. Salary discussion and job description
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Q3. Role of the working and project discussion
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Q1. You have a hotel and how will you create a complete schema for hotel
Ans. 
To create a complete schema for a hotel, you need to consider various entities like rooms, guests, reservations, staff, amenities, etc.
• Entities to include: rooms, guests, reservations, staff, amenities, invoices, payments

• Relationships between entities: guest stays in a room, staff manages reservations, amenities are available in rooms

• Attributes for each entity: room number, guest name, reservation date, staff ID, ameni
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Array duplicates and burn binary tree

Q1. Project specific
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Q1. Explain joins in SQL
Ans. 
Joins in SQL are used to combine rows from two or more tables based on a related column between them.
• Joins are used to retrieve data from multiple 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

• ...read more
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Q2. What are object and class in OOPs?
Ans. 
Objects are instances of classes in OOPs. Classes are blueprints for creating objects with attributes and methods.
• Objects are instances of classes

• Classes are blueprints for creating objects

• Classes define attributes and methods for objects

• Example: Class 'Car' with attributes like 'color' and methods like 'drive'
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Round duration - 25 minutes
Round difficulty - Easy

This was face to face interview round. All questions asked by the interviewer were based on data structures.

Q1. How do you detect a loop in a linked list?
Ans. 
• I told the interviewer about two pointers approach that is using the concept of the slow and fast pointer. Then he asked me to write its code which I wrote very neatly with comments in the code.
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Q2. Check whether two given strings are anagrams of each other.
Ans. 
• I firstly gave sorting and comparing solution, but he asked me to optimize it so I gave him a hashing based solution and he was satisfied by my approach.
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