Xcelore Senior Software Engineer Interview Questions and Answers for Experienced

Q1. What is Go Module?
Ans. 
Go Modules are a dependency management system for Go programming language, enabling versioning and isolation of packages.
• Introduced in Go 1.11 to manage dependencies more effectively.

• Allows developers to define module dependencies in a 'go.mod' file.

• Supports semantic versioning, making it easier to manage package versions.

• Modules can be versioned, allowing for reproducible builds.

• Example: 'module example.com/my/module'...read more
Answered by AI
Add your answer
Q2. What is difference between Goroutine and Thread.
Ans. 
Goroutines are lightweight, managed by Go runtime, while threads are OS-level, heavier, and managed by the OS.
• Goroutines are cheaper in terms of memory and resources compared to threads.

• Goroutines are multiplexed onto a smaller number of OS threads, allowing for efficient concurrency.

• Creating a goroutine is as simple as using the 'go' keyword, e.g., 'go myFunction()'.

• Threads require more overhead for creation and manag...read more
Answered by AI
Add your answer

I had to evaluate a software and let them understand where this software could be implemented and the pros and cons of the software.

Mcqs on javascript,. 1 coding question

Q1. Rate yourself in js, node js, react, MongoDB (separately)
Ans. 
I have a solid understanding of JS, Node.js, React, and MongoDB, with practical experience in building full-stack applications.
• JavaScript: Proficient in ES6+ features, asynchronous programming, and DOM manipulation. Example: Built a dynamic web app using vanilla JS.

• Node.js: Experienced in building RESTful APIs and handling server-side logic. Example: Developed a Node.js API for a task management app.

• React: Skilled in c...read more
Answered by AI
Add your answer
Q2. Typeof null, typeof undefined, typeof {}, typeof NaN
Add your answer
Q3. What changes came in es6
Add your answer
Q4. This keyword, closures, hoisting
Add your answer
Q5. Are let and cont variables hoisted?
Add your answer
Q6. What is global context
Add your answer
Q7. What is temporal deadzone
Add your answer
Q8. What is modules? types of modules in nodejs
Ans. 
Modules in Node.js are reusable blocks of code that encapsulate related functionality.
• Modules in Node.js can be built-in modules like fs (file system) or third-party modules like express.

• Modules help in organizing code into separate files for better maintainability and reusability.

• Modules can be imported using the require() function in Node.js.
Answered by AI
Add your answer
Q9. Index in mongodb, why we need index, is index good or bad?
Ans. 
Indexes in MongoDB improve query performance by allowing the database to quickly locate and retrieve specific documents.
• Indexes help to speed up query performance by allowing the database to quickly locate specific documents based on the indexed fields.

• Without indexes, MongoDB would have to perform a collection scan, which can be slow and resource-intensive.

• Indexes can be created on single fields or compound fields to ...read more
Answered by AI
Add your answer
Q10. What are hooks , use of useRef
Ans. 
Hooks are a feature in React that allow you to use state and other React features in functional components. useRef is a hook that allows you to create a mutable object that persists for the lifetime of the component.
• Hooks are used to add state and lifecycle methods to functional components in React

• useRef is used to create a mutable reference that persists between renders

• useRef can be used to access DOM elements directl...read more
Answered by AI
Add your answer
Q11. Fs module, http module, worker thread?
Add your answer
Q12. Why we use mongoose not mongodb driver?
Add your answer

Q1. What is oops in python
Add your answer
Q2. What is ternary operant in python
Ans. 
Ternary operator in Python is a conditional expression that evaluates to a value based on a condition.
• Ternary operator is written as 'value_if_true if condition else value_if_false'

• It is a shorthand way of writing an if-else statement in a single line

• Example: x = 10 if a > b else 20
Answered by AI
Add your answer