Mobilution It Systems Senior Software Engineer Interview Questions and Answers

Q1. Rate yourself in js, node js, react, MongoDB (separately)
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Q2. Typeof null, typeof undefined, typeof {}, typeof NaN
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Q3. What changes came in es6
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ES6 introduced several new features and improvements to JavaScript, making it more powerful and efficient.
• Arrow functions for more concise syntax

• Let and const for block-scoped variables

• Classes for easier object-oriented programming

• Template literals for easier string interpolation

• Default parameters and rest parameters for function arguments

• Destructuring assignment for easier data extraction

• Promises for asynchronous prog
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Q4. This keyword, closures, hoisting
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Q5. Are let and cont variables hoisted?
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Yes, let and const variables are hoisted but not initialized.
• let and const variables are hoisted to the top of their block scope, but they are not initialized until the actual line of code is executed.

• This means that you cannot access a let or const variable before it is declared in the code.

• For example, trying to access a let variable before it is declared will result in a ReferenceError.
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Q6. What is global context
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Global context refers to the overall environment or setting in which something exists or operates.
• Global context encompasses all variables, functions, and objects that are accessible throughout an entire program.

• It can be thought of as the 'big picture' view of a program's execution.

• In web development, global context includes the window object in JavaScript.
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Q7. What is temporal deadzone
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Temporal dead zone is a period during the variable creation process where accessing the variable results in a ReferenceError.
• Occurs when trying to access a variable before it has been declared with let or const

• Happens due to the variable being in the temporal dead zone until it is declared

• Example: accessing a variable before its declaration will result in a ReferenceError
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Q8. What is modules? types of modules in nodejs
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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.
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Q9. Index in mongodb, why we need index, is index good or bad?
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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
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Q10. What are hooks , use of useRef
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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
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Q11. Fs module, http module, worker thread?
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Q12. Why we use mongoose not mongodb driver?
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Mongoose is an Object Data Modeling (ODM) library for MongoDB that provides a higher level of abstraction and simplifies interactions with the database.
• Mongoose provides schema validation which helps maintain data integrity.

• Mongoose simplifies querying and data manipulation with built-in functions.

• Mongoose supports middleware functions for pre and post processing of data operations.
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Aptitude questions with some basic coding questions

They have given 3 coding questions and some pseudo codings

Q1. Tell about your self
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Q2. Some coding questions
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Based on JavaScript and Java.

A task based on JavaScript.

Take home assessment to build an OTP generating service

URL parser for websites

Q1. Interview with Product owner
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Q1. Interview with hiring manager
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Q1. Why You want to join us?
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I am passionate about software development and believe your company offers a great learning opportunity.
• Excited about the innovative projects your company is working on

• Impressed by the positive reviews from current and former employees

• Eager to work with experienced developers and learn from them
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Q2. How much experience you have in the skillset section provided in the JD
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I have experience working with the skillset mentioned in the job description for over a year.
• I have completed multiple projects using the skillset mentioned

• I have taken relevant courses or certifications in the skillset

• I have received positive feedback on my proficiency in the skillset from previous employers or colleagues
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Q1. Tell me about your certifications on Cloud
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I am certified in AWS Certified Solutions Architect - Associate and Google Cloud Certified - Professional Cloud Architect.
• Certified in AWS Certified Solutions Architect - Associate

• Certified in Google Cloud Certified - Professional Cloud Architect
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Q1. Desing API endpoints
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Q2. SQL queries test
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Q3. Basic and intermediate level questions on C#
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Questions about projects, DI in ASP.NET Core, React Element Tree

Section 1. 10 questions aptitude
section 2. 10 oops questions based on c++
section 3. comprehension
section 4. 10 questions English grammar

One coding question. it's like two lines of question, understand the question and write the code using any programming language.

Q1. General technical questions
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Q1. General resume based questions.
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Basic Maths related questions which are moderate