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Praeclarum Tech Interview Questions and Answers
18 Interview questions
To handle high traffic in a Node.js backend, implement strategies like clustering, load balancing, and caching.
Use Node.js clustering to utilize multiple CPU cores, e.g., 'cluster' module to fork worker processes.
Implement load balancing with tools like Nginx or HAProxy to distribute traffic evenly across servers.
Utilize caching mechanisms such as Redis or Memcached to store frequently accessed data and reduce dat...
Implement authentication using JWT and authorization with role-based access control in a Node.js application.
Use libraries like 'jsonwebtoken' for creating and verifying JWTs.
Implement user registration and login endpoints to handle credentials.
Store user passwords securely using hashing algorithms like bcrypt.
Create middleware functions to check for valid tokens and user roles.
Use environment variables to manage ...
Node.js is a JavaScript runtime built on Chrome's V8 engine, enabling server-side scripting and building scalable network applications.
Asynchronous and event-driven: Node.js uses non-blocking I/O, allowing multiple operations to be handled simultaneously.
Single-threaded model: It operates on a single thread, using event looping to manage concurrent requests efficiently.
Rich ecosystem: Node.js has a vast library of...
MongoDB is a NoSQL database that stores data in flexible, JSON-like documents, allowing for dynamic schemas and scalability.
Document-oriented: Data is stored in documents (BSON format), e.g., { 'name': 'John', 'age': 30 }.
Scalability: Supports horizontal scaling through sharding, distributing data across multiple servers.
Flexible schema: Allows for dynamic schemas, meaning fields can vary from document to document...
The event loop in JavaScript manages asynchronous operations, allowing non-blocking execution of code.
JavaScript is single-threaded, meaning it can execute one task at a time.
The call stack keeps track of function execution; when a function is called, it's pushed onto the stack.
Web APIs (like setTimeout) handle asynchronous tasks and push their callbacks to the callback queue once completed.
The event loop continuo...
Async/await simplifies asynchronous programming in JavaScript, making it easier to read and write code that handles promises.
Async functions return a promise, allowing the use of 'await' inside them.
The 'await' keyword pauses execution until the promise is resolved.
Example: async function fetchData() { const data = await fetch(url); }
Error handling can be done using try/catch blocks with async/await.
Example: try {...
I tend to be overly critical of my work, which can slow down my progress but helps me maintain high standards.
I often spend too much time perfecting details, like formatting a report, which can delay deadlines.
I struggle with delegation; for instance, I sometimes take on too many tasks in group projects, fearing others won't meet my standards.
I can be hesitant to speak up in meetings, as I worry my ideas may not b...
Dotnet Core is a free, open-source, cross-platform framework for building modern, cloud-based, and internet-connected applications.
Cross-platform framework for building applications
Open-source and free to use
Supports modern, cloud-based, and internet-connected applications
let, var, and const are used to declare variables in JavaScript with different scoping rules.
let: block-scoped variable, can be reassigned
var: function-scoped variable, can be reassigned
const: block-scoped variable, cannot be reassigned, but its properties can be modified
Closure is the combination of a function bundled together with references to its surrounding state.
Closure allows a function to access variables from its outer scope even after the outer function has finished executing.
It is created whenever a function is defined within another function, and the inner function has access to the outer function's variables.
Closure helps in maintaining the state of a function and all...
Praeclarum Tech Interview Experiences
17 interviews found
Gupta Love
Selected
I applied via Referral and was interviewed in Nov 2024. There were 3 interview rounds.
(2 Questions)
- Q1. Tell me difference between Let, Var, Cost and
- Ans.
Let, var, and const are used to declare variables in JavaScript, with differences in scope and mutability.
let: block-scoped, can be reassigned
var: function-scoped, can be reassigned
const: block-scoped, cannot be reassigned
- Q2. What is closure
- Ans.
Closure is the combination of a function bundled together with references to its surrounding state.
Closure allows a function to access variables from its outer scope even after the outer function has finished executing.
It is created whenever a function is defined within another function, and the inner function has access to the outer function's variables.
Closure helps in maintaining the state of a function and allows f...
(2 Questions)
- Q1. Define let var const
- Ans.
let, var, and const are used to declare variables in JavaScript with different scoping rules.
let: block-scoped variable, can be reassigned
var: function-scoped variable, can be reassigned
const: block-scoped variable, cannot be reassigned, but its properties can be modified
- Q2. Define Closure
- Ans.
Closure is a function that has access to its own scope, as well as the scope in which it was defined.
A closure allows a function to access variables from an outer function even after the outer function has finished executing.
Closures are commonly used in event handlers, callbacks, and in functional programming.
Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log...
(2 Questions)
- Q1. What is your hobbies
- Q2. What is your Strength
Ritu Limbasiya
Selected
I appeared for an interview in Mar 2025, where I was asked the following questions.
- Q1. What are your Strengths?
- Ans.
I possess strong analytical skills, adaptability, and effective communication, which help me excel in collaborative environments.
Analytical Skills: I excel at breaking down complex problems, as demonstrated in my project where I analyzed data trends to improve efficiency.
Adaptability: I quickly adjust to new situations, like when I learned a new software tool in a week to meet project deadlines.
Effective Communication:...
- Q2. What are your weeknesses?
- Ans.
I tend to be overly critical of my work, which can slow down my progress but helps me maintain high standards.
I often spend too much time perfecting details, like formatting a report, which can delay deadlines.
I struggle with delegation; for instance, I sometimes take on too many tasks in group projects, fearing others won't meet my standards.
I can be hesitant to speak up in meetings, as I worry my ideas may not be wel...
Anonymous
Selected
I applied via Referral and was interviewed in Jun 2024. There were 2 interview rounds.
(2 Questions)
- Q1. What is MVC and Explain its life cycle?
- Ans.
MVC stands for Model-View-Controller, a software design pattern used for organizing code in a structured manner.
Model represents the data and business logic of the application.
View is responsible for displaying the data to the user.
Controller acts as an intermediary between Model and View, handling user input and updating the Model accordingly.
MVC life cycle involves user interacting with the View, which triggers the C...
- Q2. What is dotnet core?
(2 Questions)
- Q1. Tell me about yourself
- Q2. What is your notice period?
Selected
I applied via LinkedIn and was interviewed in Jun 2024. There were 3 interview rounds.
Asking javascript algorithms and other technical questions based on response
(2 Questions)
- Q1. What is eventloop
- Ans.
The event loop is a mechanism in programming that allows for asynchronous execution of code by continuously checking for and handling events.
The event loop is commonly used in JavaScript to handle asynchronous operations such as setTimeout, setInterval, and AJAX requests.
It allows for non-blocking I/O operations, meaning that the program can continue to run other tasks while waiting for I/O operations to complete.
The e...
- Q2. What is hoisting?
(2 Questions)
- Q1. What is your strength?
- Ans.
My strengths include problem-solving skills, attention to detail, and strong programming abilities.
Strong problem-solving skills - I enjoy tackling complex issues and finding creative solutions.
Attention to detail - I am meticulous in my work to ensure high-quality results.
Strong programming abilities - I have expertise in multiple programming languages such as Java, Python, and C++.
- Q2. What is your main weakness?
- Ans.
My main weakness is that I tend to get too focused on details, which can sometimes slow down my progress.
I have a tendency to get caught up in the minutiae of a project, which can lead to delays in completing tasks.
I am working on improving my time management skills to ensure that I am able to balance attention to detail with overall project timelines.
An example of this weakness is when I spent too much time perfecting...
Interview Preparation Tips
Skills evaluated in this interview
Selected
I applied via Referral and was interviewed in Jun 2024. There were 2 interview rounds.
(2 Questions)
- Q1. What is react js?
- Ans.
React JS is a JavaScript library for building user interfaces.
React JS is developed and maintained by Facebook.
It allows developers to create reusable UI components.
React uses a virtual DOM for better performance.
It follows a component-based architecture.
React can be used for building single-page applications.
- Q2. What is node?
(2 Questions)
- Q1. Tell me about yourself
- Q2. Tell me about your family
Skills evaluated in this interview
Selected
I applied via Indeed and was interviewed in Nov 2024. There was 1 interview round.
Shoping card api integration
Interview Preparation Tips
Selected
I appeared for an interview in Oct 2024, where I was asked the following questions.
- Q1. How do you handle high traffic in a Node.js backend?
- Ans.
To handle high traffic in a Node.js backend, implement strategies like clustering, load balancing, and caching.
Use Node.js clustering to utilize multiple CPU cores, e.g., 'cluster' module to fork worker processes.
Implement load balancing with tools like Nginx or HAProxy to distribute traffic evenly across servers.
Utilize caching mechanisms such as Redis or Memcached to store frequently accessed data and reduce database...
- Q2. How would you implement authentication and authorization in a Node.js application?
- Ans.
Implement authentication using JWT and authorization with role-based access control in a Node.js application.
Use libraries like 'jsonwebtoken' for creating and verifying JWTs.
Implement user registration and login endpoints to handle credentials.
Store user passwords securely using hashing algorithms like bcrypt.
Create middleware functions to check for valid tokens and user roles.
Use environment variables to manage sensi...
Selected
I appeared for an interview in Oct 2024, where I was asked the following questions.
- Q1. React js and JavaScript Related Questions
- Q2. Practical Task in Backend or Frontend
Selected
I appeared for an interview in Oct 2024, where I was asked the following questions.
- Q1. Explain the concept of async/await.
- Ans.
Async/await simplifies asynchronous programming in JavaScript, making it easier to read and write code that handles promises.
Async functions return a promise, allowing the use of 'await' inside them.
The 'await' keyword pauses execution until the promise is resolved.
Example: async function fetchData() { const data = await fetch(url); }
Error handling can be done using try/catch blocks with async/await.
Example: try { cons...
- Q2. What is the event loop in JavaScript?
- Ans.
The event loop in JavaScript manages asynchronous operations, allowing non-blocking execution of code.
JavaScript is single-threaded, meaning it can execute one task at a time.
The call stack keeps track of function execution; when a function is called, it's pushed onto the stack.
Web APIs (like setTimeout) handle asynchronous tasks and push their callbacks to the callback queue once completed.
The event loop continuously ...
Selected
I appeared for an interview in Oct 2024, where I was asked the following questions.
- Q1. Ask about node.js
- Ans.
Node.js is a JavaScript runtime built on Chrome's V8 engine, enabling server-side scripting and building scalable network applications.
Asynchronous and event-driven: Node.js uses non-blocking I/O, allowing multiple operations to be handled simultaneously.
Single-threaded model: It operates on a single thread, using event looping to manage concurrent requests efficiently.
Rich ecosystem: Node.js has a vast library of modu...
- Q2. Ask about mongoDb
- Ans.
MongoDB is a NoSQL database that stores data in flexible, JSON-like documents, allowing for dynamic schemas and scalability.
Document-oriented: Data is stored in documents (BSON format), e.g., { 'name': 'John', 'age': 30 }.
Scalability: Supports horizontal scaling through sharding, distributing data across multiple servers.
Flexible schema: Allows for dynamic schemas, meaning fields can vary from document to document.
Rich...
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Praeclarum Tech Reviews and Ratings
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Senior Software Engineer
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|  ₹7 L/yr - ₹10.5 L/yr |
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