Hire MERN Stack Developers

There are innumerable MERN developers for hire in the market available at various costs. But then how to choose the best and the most relevant one for your specific project? Along with simplifying the hiring process, we also attempt to make the selection process easy for you. For that, we have listed some significant questions that you can ask the candidates as you hire MERN developers. Proper answers from them will give you clear insight into their understanding of the technology and their overall expertise.

1. What does "Virtual DOM" mean? How does it work?

   A virtual DOM is a compact JavaScript object that is merely a duplicate of the actual DOM at first. Here, the elements, their attributes, and the content are listed as objects with properties in a node tree format. Similarly, the React render method arranges the React components into a node tree. In the end, the system then updates this tree following data model mutations brought on by various user or system actions.

2. What distinguishes a functional component from a class component?

   Functional components and Class components are elements of React that enable it to enhance the development process. However, both have different functions majorly,

   Class Components

   • Class components are extensions of React components.
   • ES6 class syntax is used by class-based components. It may employ lifecycle methodologies.
   • To access the properties and functions that declare inside the class components in a section, we must use the keyword.

   Functional Components

   • Comparatively, class-based functions are more complex than functional components.
   • Functional Components primarily concentrate on the application’s user interface (UI), rather than its functionality.
   • To make it more accurate, the class component’s rendered functions are what these are.
   • Utilizing Reach Hooks, Functional Components can simulate lifecycle events and have a state.

3. What are Node.js's main characteristics?

   Node.js is a feature-packed technology enriching the project with various functions. An experienced MERN stack developer for hire will know all of them to be able to use them in your web app. Some of the main characteristics you can expect are,

   • All APIs in Node.js is asynchronous, which assists with simultaneous request handling. With the help of this functionality, a Node will conduct an Input/Output action when it is requested in the background while still executing other tasks. As a result, it won’t wait for the previous requests’ responses.
   • Node.js employs the same JavaScript runtime engine as Google Chrome, which makes code execution quick. The JavaScript engine in Node features a wrapper that speeds up the runtime engine, which in turn speeds up how quickly Node.js processes requests.
   • It uses a single-thread architecture for event looping, making it very scalable. Hence, the server might or might not immediately receive a response from such events. Other operations are not hindered by this, though. Node.js becomes very scalable as a result. Node.js creates a single thread that serves a significantly higher volume of requests than traditional servers, which create a finite number of threads to fulfill requests.
   • JavaScript support in the Node.js library would be another significant element from the developer’s perspective. Most programmers are already proficient in JavaScript. As a result, a developer who is familiar with JavaScript finds Node.js development to be simpler.

4. Describe the benefits of BSON over JSON in MongoDB.

   Hire MERN stack programmer who has a clear understanding of BSON and JSON and their usage. A knowledgeable developer will be aware of these benefits of BSON over JSON,

   • The encoding and decoding of BSON are intended to be quick. Integers, for instance, don’t require parsing to and from the text because they are kept as 32 (or 64) bit integers. Small integers take up more space in this than in JSON, but parsing takes significantly less time.
   • BSON includes new data types that JSON does not include. Most notably the BinData and Date data types, in addition to being more compact.
   • Although BSON is intended to be space-efficient, it sometimes isn’t all that much more efficient than JSON.
   • BSON occasionally takes up even more storage than JSON. This is due to traversability, one of the BSON design objectives.
   • The length of strings and sub-objects are only a couple of the “additional” details that BSON contributes to documents. This expedites traversal.

5. How would Node.js manage concurrency if it is single-threaded?

   As a full stack MERN developer, this forms the base of their expertise and, thus must be able to answer in detail. Like,
   Node offers programmers a single thread so that code may be created quickly and efficiently. For various I/O activities including file, DNS, network calls, etc., Node internally uses numerous POSIX threads.

   When Node receives an I/O request, it either creates or utilizes a thread to carry out the I/O operation and after it is complete, it pushes the outcome to the event queue. Whenever one of these events occurs, the event loop examines the queue and, if the execution stack of the Node is empty, adds the queue result to the execution stack. Concurrency is handled in this way by Node.

6. What does JSX in ReactJS mean?

   Knowing in-depth about React adds to the advantage of your project when you hire MERN developer. Hence, they must know that React elements are created by JSX. The complete functionality of JavaScript is available through JSX, which is a syntax extension to JavaScript. Any JavaScript expression can be included in JSX by being enclosed in curly braces. After compilation, JSX expressions are changed into normal JavaScript objects. As a result, one may assign JSX to variables, take it as arguments, return it from functions, and use it inside of if statements and for loops.

7. How can you prevent prop drilling and what is it?

   When developing a React application, it’s common for a component that is extensively nested to need to access data from a component that is significantly above in the hierarchy. Simply passing a prop from one component in the hierarchy to the next, from the source component to the deeply nested component, is the easiest method. Proper drilling is used for this. Hire remote MERN stack developer who is well aware of this. Because the biggest drawback of prop drilling is that it makes maintenance more difficult and makes components that shouldn’t normally be aware of the data more problematic.

8. What is MongoDB used for?

   A document-oriented database manager called MongoDB is made for large data sets. It incorporates the concepts of collecting and documentation and saves data in binary JSON format. With its excellent performance, great scalability, and adaptability, MongoDB is a cross-platform NoSQL database that enables easy querying and indexing. Hire MERN developer who can make the best use of these to give data-driven functions to your project.

9. What does ExpressJS help to perform?

   A web application framework called ExpressJS is made specifically to host and support Node.js projects. It is a free framework that is distributed with the MIT license. Also, ExpressJS controls the data transmission process and ensures a secure connection between the front end and the database. And provides top-notch error handling and web design features to speed up site development. An efficient developer must be able to exploit this to the fullest in his MERN stack development services.

10. Explain data modeling.

    Hire MERN stack programmer who can do this without any glitches.

    • The terms “data modeling” and “MongoDB” are used with one another. Data modeling, as the name implies, is the process of developing a data model for the current data so that it may be stored in a database.
    • A data model is a visual representation of the relationships between various data elements, along with the rules that govern those relationships.
    • In addition to enforcing business standards, regulatory compliances, and governmental policies on the data, it aids in the visual representation of the data.
    • It is used to guarantee consistency in the data’s semantics, security, default values, and naming conventions.