Subex Software Developer Interview Questions and Answers

OOPS , DBMS , OS , and DSA concepts

Q1. DBMS related concepts
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Q2. Networking and Network Security
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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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Q1. Project related
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Q2. How you solve questions
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As a recent college graduate, I am actively seeking employment opportunities where I can effectively apply my
skills. Currently pursuing a Bachelor of Engineering in Artificial Intelligence and Machine Learning, I strive to push
my limits to explore new possibilities and acquire additional skills. Aspiring to work in a growth-oriented
environment where I can achieve excellence under existing working conditions, and contribute to the goals of the
organization.

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Core Java , DS and Algo

Q1. LLD Spotify only structure
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Q2. Shortest path algorithm
Ans. 
Shortest path algorithm finds the shortest path between two nodes in a graph.
• Dijkstra's algorithm is a popular shortest path algorithm that uses a priority queue to find the shortest path in a weighted graph.

• A* algorithm is another popular shortest path algorithm that uses heuristics to guide the search towards the goal node.

• Bellman-Ford algorithm is used for finding the shortest path in a graph with negative edge weig
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Q1. Reason for the change
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Q2. What you bring to the table
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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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