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Happiest Minds Technologies Interview Questions and Answers
66 Interview questions
To handle high traffic in Node.js, use clustering, load balancing, caching, optimizing code, and scaling horizontally.
Implement clustering to utilize multiple CPU cores efficiently.
Use load balancing to distribute incoming requests across multiple servers.
Implement caching to store frequently accessed data and reduce database load.
Optimize code for performance by identifying and fixing bottlenecks.
Scale horizontal...
Closures are functions that have access to variables from their containing scope even after the scope has closed.
Closures allow for data encapsulation and privacy in JavaScript.
They are commonly used in event handlers, callbacks, and modules.
Example: A counter function using closures to maintain its state.
Event Loop is a mechanism in Node.js that allows non-blocking I/O operations to be performed asynchronously.
Event Loop is responsible for handling asynchronous operations in Node.js.
It allows Node.js to perform I/O operations without blocking the execution of other code.
Event Loop continuously checks the event queue for new events and executes them in a loop.
It helps in achieving high performance and scalability i...
ArrayList is a resizable array implementation of the List interface in Java, allowing dynamic storage of elements.
Dynamic Size: Unlike arrays, ArrayLists can grow and shrink in size as needed.
Type Safety: Can store objects of a specific type when using generics, e.g., ArrayList<String>.
Performance: Provides fast random access to elements but slower for insertions/removals compared to linked lists.
Methods: Co...
API testing is a type of software testing that involves testing APIs directly to ensure they meet functionality, reliability, performance, and security requirements.
API testing involves testing the functionality, reliability, performance, and security of APIs.
It focuses on verifying the communication and data exchange between different software systems.
API testing can be done using tools like Postman, SoapUI, or c...
Overview of OWASP Top 10 vulnerabilities with mitigation strategies and prerequisites.
1. XSS (Cross-Site Scripting): Injecting malicious scripts into web pages. Mitigation: Use Content Security Policy (CSP) and sanitize user inputs.
2. CSRF (Cross-Site Request Forgery): Forcing users to execute unwanted actions. Mitigation: Use anti-CSRF tokens and SameSite cookie attribute.
3. SQL Injection: Inserting malicious SQL...
Function to reverse a given string.
Create an empty string to store the reversed string.
Iterate through the input string in reverse order and append each character to the new string.
Return the reversed string.
Function to find duplicates in an array of integers and return a list of unique duplicates.
Iterate through the array and keep track of elements seen before using a hash set.
If an element is already in the hash set, add it to the result list.
Return the list of unique duplicates found.
Reverse an array of integers in place
Create two pointers, one at the start and one at the end of the array
Swap the elements at the two pointers and move them towards the center until they meet
Time complexity: O(n), Space complexity: O(1)
React code for a simple counter
Create a functional component for the counter
Use useState hook to manage the count state
Render the count value and buttons to increment and decrement the count
Happiest Minds Technologies Interview Experiences
139 interviews found
Anonymous
Selected
(2 Questions)
- Q1. Time Series Forecasting, ACF and PACF Curves, ARIMA model
- Q2. Questions on classical machine learning
(2 Questions)
- Q1. Bias Variance tradeoff, decision trees, sigmoid function
- Q2. Bagging boosting linear regression any many more
Interview Preparation Tips
I appeared for an interview in Jan 2025.
(6 Questions)
- Q1. Explain about Event Loop?
- Ans.
Event Loop is a mechanism in Node.js that allows non-blocking I/O operations to be performed asynchronously.
Event Loop is responsible for handling asynchronous operations in Node.js.
It allows Node.js to perform I/O operations without blocking the execution of other code.
Event Loop continuously checks the event queue for new events and executes them in a loop.
It helps in achieving high performance and scalability in Nod...
- Q2. AWS related services questions based on your work experience.
- Q3. Which is favorite sorting mechanism and write code?
- Ans.
My favorite sorting mechanism is Quick Sort.
Quick Sort is a divide-and-conquer algorithm that recursively divides the array into smaller subarrays.
It has an average time complexity of O(n log n) and is efficient for large datasets.
Example code snippet: function quickSort(arr) { if (arr.length <= 1) { return arr; } const pivot = arr[arr.length - 1]; const left = []; const right = []; for (let i = 0; i < arr.length...
- Q4. How to handle load or High traffic in node.js?
- Ans.
To handle high traffic in Node.js, use clustering, load balancing, caching, optimizing code, and scaling horizontally.
Implement clustering to utilize multiple CPU cores efficiently.
Use load balancing to distribute incoming requests across multiple servers.
Implement caching to store frequently accessed data and reduce database load.
Optimize code for performance by identifying and fixing bottlenecks.
Scale horizontally by...
- Q5. What is Closures and write a simple code along with its real time use case?
- Ans.
Closures are functions that have access to variables from their containing scope even after the scope has closed.
Closures allow for data encapsulation and privacy in JavaScript.
They are commonly used in event handlers, callbacks, and modules.
Example: A counter function using closures to maintain its state.
- Q6. Threading concept
Selected
I appeared for an interview in Dec 2024.
(2 Questions)
- Q1. Basic Owasp top 10 vulnerabilities(i.e. XSS, CSRF, SSL pinning, SQL injection, IDOR, etc) with mitigate and prerequisites.
- Ans.
Overview of OWASP Top 10 vulnerabilities with mitigation strategies and prerequisites.
1. XSS (Cross-Site Scripting): Injecting malicious scripts into web pages. Mitigation: Use Content Security Policy (CSP) and sanitize user inputs.
2. CSRF (Cross-Site Request Forgery): Forcing users to execute unwanted actions. Mitigation: Use anti-CSRF tokens and SameSite cookie attribute.
3. SQL Injection: Inserting malicious SQL quer...
- Q2. API security questions, i.e api mass assingment, common vulnerabilities
(1 Question)
- Q1. XXE, insecure deserialization,DOM vs Store xss
Selected
I applied via Naukri.com and was interviewed in Nov 2024. There were 3 interview rounds.
(2 Questions)
- Q1. Cloudfront related questions
- Q2. AWS service like Eks ECS
(2 Questions)
- Q1. DevOps CICD related
- Q2. IAC terraform question
(2 Questions)
- Q1. Salary negotiation
- Q2. Simple discussion about yourself
Interview Preparation Tips
- AWS
- Azure
Tasleem
(2 Questions)
- Q1. Introduction, Process knowledge
- Q2. Naukri portal test
(2 Questions)
- Q1. Long term goal, family background
- Q2. Ctc negotiation
Selected
(3 Questions)
- Q1. What are closures
- Ans.
Closures are functions that have access to variables from their containing scope even after the scope has closed.
Closures allow functions to access variables from their outer function even after the outer function has finished executing.
They are commonly used in event handlers, callbacks, and asynchronous programming.
Closures help in maintaining state in functional programming.
- Q2. What is virtual DOM
- Ans.
Virtual DOM is a lightweight copy of the actual DOM used for efficient updates in web development.
Virtual DOM is a concept used in frameworks like React to improve performance by minimizing actual DOM manipulations.
When changes are made to the virtual DOM, a comparison is done with the actual DOM to determine the minimal updates needed.
This approach reduces the number of costly DOM operations, resulting in faster rende...
- Q3. What are the data types in JS
- Ans.
Data types in JavaScript include number, string, boolean, object, function, undefined, and null.
Number - represents numeric data, e.g. 10, 3.14
String - represents textual data, e.g. 'hello', '123'
Boolean - represents true or false values, e.g. true, false
Object - represents complex data structures, e.g. { key: 'value' }
Function - represents executable code, e.g. function() { }
Undefined - represents a variable that has ...
(1 Question)
- Q1. Write react code for counter
- Ans.
React code for a simple counter
Create a functional component for the counter
Use useState hook to manage the count state
Render the count value and buttons to increment and decrement the count
(1 Question)
- Q1. Salary discussion
Interview Preparation Tips
Skills evaluated in this interview
Darshan roopa
Basic coding along with general aptitude
(3 Questions)
- Q1. What is oops describe with real time example?
- Q2. Describe about data structures with real time examples?
- Ans.
Data structures are ways to organize and store data efficiently in a computer.
Data structures are used to store and organize data in a way that makes it easy to access and manipulate.
Examples of data structures include arrays, linked lists, stacks, queues, trees, and graphs.
For example, an array is a data structure that stores a collection of elements in a contiguous block of memory.
A linked list is a data structure wh...
- Q3. What makes you different from other candidates?
- Ans.
I bring a unique blend of technical skills, problem-solving abilities, and a collaborative mindset that sets me apart from other candidates.
Strong problem-solving skills: I successfully optimized a legacy system, reducing processing time by 30%.
Diverse technical expertise: I have experience in multiple programming languages, including Python, Java, and JavaScript, allowing me to adapt to various projects.
Collaboration ...
(2 Questions)
- Q1. Why do you choose happiest minds ?
- Q2. Why should we hire you?
Interview Preparation Tips
Skills evaluated in this interview
Nagaraj Purohit
(5 Questions)
- Q1. Data warehousing related questions
- Q2. SQL scenario based questions
- Q3. Project experience
- Ans.
I have experience working on projects involving data pipeline development, ETL processes, and data warehousing.
Developed ETL processes to extract, transform, and load data from various sources into a data warehouse
Built data pipelines to automate the flow of data between systems and ensure data quality and consistency
Optimized database performance and implemented data modeling best practices
Worked on real-time data pro...
- Q4. Python Based questions
- Q5. AWS features and questions
(2 Questions)
- Q1. Similar to first round but in depth questions relatively
- Q2. Asked about career goals and stuff
(2 Questions)
- Q1. General work related conversation
- Q2. Salary discussion
Pooja Singh
(2 Questions)
- Q1. Basics Js and react
- Q2. Memoization, useEffect vs useLayoutEffect
Selected
I applied via Naukri.com and was interviewed in Aug 2024. There were 3 interview rounds.
(2 Questions)
- Q1. Asked questions on protocols, memory layout, c programming.
- Q2. C programming tricky questions on structures, string, arm architecture, variable types.
(1 Question)
- Q1. In depth questions on programming
(1 Question)
- Q1. Basic details of experience
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Happiest Minds Technologies Interviews By Designations
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