Nagarro Senior Software Engineer Interview Questions, Process, and Tips

Q1. What is Node.js event loop and how its work?
Ans. 
Node.js event loop is a mechanism that allows Node.js to perform non-blocking I/O operations asynchronously.
• Event loop is responsible for handling asynchronous operations in Node.js.

• It allows Node.js to perform multiple operations simultaneously without blocking the execution.

• Event loop continuously checks the event queue for new events and executes them in a non-blocking manner.

• Callbacks are used to handle the complet
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Q2. DBMS questions like joins
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- Basic data structures questions.
- Node.js specific questions.

Q1. Basic managerial questions
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Q1. Create a todo kind app using react, then optimize by adding custom hooks, optimize performance
Ans. 
Create a todo app using React, optimize with custom hooks for performance.
• Create a basic todo app using React

• Identify areas for optimization such as state management

• Implement custom hooks for optimized performance

• Use useMemo and useCallback hooks to optimize rendering

• Consider lazy loading components for better performance
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Q2. Create debounce function
Ans. 
Debounce function delays the execution of a function until after a specified amount of time has passed since the last time it was invoked.
• Use setTimeout to delay the execution of the function

• Use clearTimeout to reset the timer if the function is invoked again within the specified time period

• Commonly used in scenarios like search bars to prevent excessive API calls
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Q1. JEST and noSQL related questions
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Q2. Some detailed discussion on optimization and accessibility
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Java and Java related tech questions

This was mix of aptitude test with questions related to .Net MVC, CSS, HTML and OOPS

Q1. 1. Explain Middleware in .Net Core
Ans. 
Middleware in .Net Core is a software component that acts as a bridge between an application's request processing pipeline and the server.
• Middleware components are executed in the order they are added to the pipeline.

• They can perform tasks like authentication, logging, error handling, etc.

• Middleware can be added using the 'UseMiddleware' method in the 'Configure' method of Startup class.
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Q2. 2. Entity Framework related questions like different approached of entity framework and what is DBContext file.
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Q3. 3. JavaScript: difference between var and let keyword, closure function
Ans. 
var keyword has function scope, let keyword has block scope. Closure function is a function defined inside another function.
• var keyword has function scope, let keyword has block scope

• Variables declared with var are hoisted to the top of their function, let variables are not hoisted

• Closure function is a function defined inside another function, has access to the outer function's variables
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Q4. 4. React: What is Virtual DOM, useState and different types of Hooks in React
Ans. 
Virtual DOM is a lightweight copy of the actual DOM, useState is a hook for managing state in functional components, and Hooks are functions that let you use state and other React features in functional components.
• Virtual DOM is a lightweight copy of the actual DOM that React uses to improve performance by updating only the necessary parts of the actual DOM.

• useState is a hook in React that allows functional components ...read more
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Q5. 5. SQL: Different Types of triggers, define index and its types
Ans. 
Triggers in SQL are special stored procedures that are automatically executed when certain events occur in a database. Indexes in SQL are used to speed up the retrieval of data from tables.
• Types of triggers: DML triggers (insert, update, delete), DDL triggers (create, alter, drop), and Logon triggers.

• Indexes in SQL are used to quickly retrieve data from tables. Types of indexes include clustered, non-clustered, unique,...read more
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