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Hire Remote MERN Full Stack Developers in 24 hrs

Your web application should be developed correctly! And only the right choice of technology and experts can help you achieve that. Today, innovation reigns supreme, and the success of your project depends on the development team. 

UltraGenius is a fast-growing platform that’ll connect your business to an expert chosen after rigorous screening and holds a chair in the top 1% of developers. You can seamlessly hire a MERN stack developer for your project and make your web application robust and unique.

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Hire only the top 1% among the 20K+ engineers who have applied to UltraGenius


MERN developer

Rishabh is a software engineer having 7+ years of experience in designing Single Page Applications and mobile applications using MERN stack

Expert in






10 Years


Full Time


MERN developer

Mahesh is a software engineer having 3+ years of experience in developing dynamic single page web applications and mobile apps using MERN stack.

Expert in






10 Years


Full Time


Part-time MERN developer

John is a software engineer having 10+ years of experience developing websites and applications using MongoDB, Express, Node, and React.js as the front-end library framework.

Expert in






10 Years


Full Time

MERN Stack

Hire dedicated MERN stack developers with UltraGenius

Whether you are looking to hire experts for short-term or long-term projects, we at UltraGenius do not compromise with the talent. After a rigorous screening process, we handpick the top 1% of talent from the pool of 50K engineers who have applied on our platform.

What UltraGenius offers?

Fast Hiring

ultraGenius ensures that top quality developers with the most talent are hired in less than 72 hours.

Intelligent Matching

The matches are specifically curated as per your needs. We dim fit 3 skills - Tech, Culture, and Context Fit.

Rigorous Vetting

ultraGenius conducts tests and ensures that only the most suitable developer with the best skills is hired.

Hire MERN developers through UltraGenius in 4 easy steps

Tell us the skills you need

We’ll schedule a call and understand your requirements.

We find the best talent for you

Get the list of pre-vetted candidates in days.

Schedule the interviews

We will arrange a call after understanding your requirements.

Begin your trial

Start working with UltraGenius with a 1-week trial period.

Our Happy Clients

UltraGenius is the best remote talent network to meet with brilliant developers who are most talented and skilled in the technical field. UltraGenius provides the most fit developers who not only match our job requirements but also our company's culture and working environment.
Once you are part of UltraGenius, you don't have to look for another platform which can find the top skilled developers with same effort as UltraGenius. UltraGenius's vetting tests and assessments are unmatchable and provides the perfect match for the job role.
Our company is thankful to UltraGenius wholeheartedly. UltraGenius's pace of finding the top 1% developers is unmatchable. Not only UltraGenius developers are the ones who match our job requirements but also the best fit to our company's working culture .
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Join 200+ Fast-scaling Start ups
and Fortune 500 Companies that have hired MERN developers

Want to hire Remote MERN developers on your own? Here are the some tips you must look for while hiring a MERN engineer

Unveiling the Skills of a MERN Stack Expert: Boosting Web Development Excellence

In the evolving world of web development, where trends and technologies change at lightning speed, the MERN stack has bloomed as a potent combination for building robust and versatile web applications. If you choose a pre-screened, full-time, part-time, or freelance MERN stack developer from UltraGenius, they will possess a unique set of talents that’ll enable them to harness the full potential of this stack. 

1. Command in JavaScript

At the heart of the MERN stack lies JavaScript, the ubiquitous language of the web. A professional MERN stack architect has a profound knowledge of JavaScript and its different concepts, such as object-oriented programming, closures, and asynchronous programming. They are trained at leveraging JavaScript to create interactive and responsive web interfaces.

2. Expertise in React

React, the renowned JavaScript library for building user interfaces is a critical part of the MERN stack. An experienced MERN stack professional exhibits a powerful command over React, utilizing its component-based architecture, state management techniques, and virtual DOM manipulation to make seamless and attractive user experiences.

3. In-Depth Knowledge of MongoDB

As a NoSQL database, MongoDB is a root component of the MERN stack. A professional MERN stack designer knows MongoDB’s document-based data model, indexing, querying, and aggregation capabilities. They are adept at melding MongoDB into web applications and optimizing data storage and retrieval processes.

4. Proficiency in Node.js and Express.js

Node.js and Express.js enable developers to build scalable and efficient server-side components. A skilled MERN stack expert can manage server-side operations using Node.js and Express.js, create RESTful APIs, and construct reliable back-end structures. However, if you want to leverage the power of another technology, i.e., MEAN stack, then you can hire mean stack developers too.

5.  Problem-Solving and Troubleshooting Abilities

A thriving developer has excellent problem-solving and troubleshooting skills. They can recognize and fix issues correctly, debug code effectively, and optimize application performance.

Interview Questions to Discover the True Mastery of a MERN Stack Developer

In the quest to hire a dedicated developer in India from UltraGenius, asking the right interview questions can unearth hidden depths of knowledge, problem-solving abilities, and true mastery of the stack.  Let’s explore interview questions to help you identify exceptional MERN stack specialists.

1. Suppose you uncover a bug in your code that is bothering you. What will be your approach and solution?

When faced with a tricky bug, I start by retracing my steps and carefully reviewing the code. I would isolate the problem and employ debugging techniques like console logging or development tools like Chrome DevTools. If the issue persists, I consult the documentation and online forums or contact fellow developers for insights. 

2. How do you ensure scalability and performance in a MERN stack application?

I prioritize modularity and extensibility during system design to ensure scalability and performance in a MERN stack application. I incorporate load balancing, caching, and database optimization techniques. Tools like Redis handle session management, while CDN services enhance content delivery.

I optimize code, minimize network requests, and perform server-side rendering. Further, regular profiling and testing aid in identifying bottlenecks and fine-tuning the application for optimal speed and responsiveness.

3. What steps do you take to ensure data security in a MERN stack application?

Data security in a MERN stack application is of utmost importance. To ensure the protection of sensitive data, I follow industry best practices. This involves implementing secure authentication and authorization mechanisms like JWT or OAuth. 

I meticulously sanitize user inputs to prevent SQL injection attacks and utilize encryption techniques for safeguarding sensitive information. Regular security audits, vulnerability scanning, and staying up-to-date with security patches and libraries are essential steps I take to maintain a secure application environment.

Expand Your Business by hiring the leading MERN stack proficients.

Regarding web development, you can hire MERN stack developers in India for game-changing results. The experienced developers are skilled at leveraging the capability of MongoDB, Express.js, React, and Node.js to boost your company to achieve goals.

1. Adequate User Experience

A MERN stack professional has skills in creating interactive and dynamic user interfaces using React. By crafting intuitive and visually appealing interfaces, they make immersive experiences that engage and captivate users. This results in increased customer fulfillment, improved user retention, and enhanced business growth. However, if you think you need another framework for your web application, you can also check out hiring Laravel developers

2. Faster Development Process

MERN stack development allows rapid prototyping and faster iteration cycles. With a unified technology stack, MERN stack innovators can seamlessly manage front-end and back-end development, reducing compatibility problems and facilitating growth. Thus, this accelerated development timeline allows you to bring your web applications to market faster, gaining a competitive edge in the industry.

3. Future-Proofing 

The MERN stack is created on solid and widespread technologies that continue to evolve and gain across-the-board adoption. By hiring a MERN stack expert, you invest in future-proofing your web applications. These developers stay updated with the latest trends, emerging technologies, and best practices, ensuring your applications remain competitive and relevant in the long run.

Explore the beneficial responsibilities of MERN stack engineers.

In the fast-paced web development industry, you can hire a MERN stack developer to harness the strengths of MongoDB, Express.js, React, and Node.js to craft reliable web applications. However, which responsibilities make them unique and the best fit for your development team? Let’s explore.

1. Full-stack Proficiency

MERN stack developers have a unique ability to work seamlessly across the entire web application stack. They excel in front-end and back-end development to create cohesive and efficient applications. From designing captivating user interfaces with React to architecting robust server-side components with Node.js and Express.js, MERN stack architects demonstrate their proficiency in the entire development lifecycle.

2. Efficient Data Management

With MongoDB as a root component, developers take on the responsibility of efficient data management. They design and implement data models, control database operations, and optimize data storage and retrieval processes. These developers confirm the application’s scalability, performance, and security while maintaining data integrity and leveraging MongoDB’s unique features.

3. Continuous Learning and Adaptability

The technology landscape is ever-evolving, and MERN stack experts adopt constant learning and adaptability as significant responsibilities. They stay current with the latest advancements, analyze emerging trends, and expand their skill sets. These developers quickly adopt new tools, libraries, and best practices, ensuring your applications remain cutting-edge and future-proof.

Key Aspects to Consider When Hiring MERN Stack Developers

Hiring the right MERN stack expert is crucial when building exceptional web applications. You can choose tech-savvy individuals from UltraGenius who have a unique skill set with expertise in MongoDB, Express.js, React, and Node.js. However, identifying the ideal developer requires carefully evaluating certain essential aspects. 

1. Technical Ability

A top-notch MERN stack developer should confirm proficiency in JavaScript, React, Node.js, Express.js, and MongoDB. You can assess their depth of knowledge through coding exercises, technical assessments, and discussions about their previous projects.

2. Experience and Portfolio

You can evaluate the candidate’s experience and review their portfolio to measure their expertise in building MERN stack applications. Further, you can look for projects that align with your industry or requirements, showcasing their ability to handle complex tasks, scalability, and innovative problem-solving.

3. Communication and Collaboration

You should remember that effective communication and collaboration skills are paramount for seamless teamwork and project success. So, you can check the candidate’s ability to articulate ideas, explain technical concepts, and work cohesively within a team environment.

4. Cultural Fit

You can check whether the candidate’s values, work ethic, and attitude align with your company culture. A solid cultural fit ensures a harmonious work environment and enhances collaboration and productivity.

5. References and Recommendations

You can contact the candidate’s references or seek recommendations from trusted sources in the industry. This helps validate their skills, work ethic, and professionalism.

Frequently Asked Questions

Q1. How does the MERN stack differ from other web development stacks?

The MERN stack is unique for its combination of MongoDB (a NoSQL database), Express.js (a web application framework), React (a JavaScript library for building user interfaces), and Node.js (a JavaScript runtime). Unlike traditional LAMP or MEAN stacks, MERN leverages React for dynamic front-end development and MongoDB for flexible data storage.

Q2. Can a MERN stack developer work with other databases apart from MongoDB?

Yes, the developers are not limited to MongoDB. While MongoDB is commonly used due to its compatibility with JavaScript and JSON-like data structure, MERN stack specialists can work with other databases like MySQL or PostgreSQL if the project requirements call for it.

Q3. What tools and libraries do MERN stack developers commonly use?

MERN stack developers rely on a range of tools and libraries such as Webpack for bundling and optimizing code, Babel for transpiling modern JavaScript, Redux for state management, Axios for making HTTP requests, and Mongoose for working with MongoDB, among others.

Q4. How do MERN stack developers stay updated with the latest trends and technologies?

MERN stack developers understand the importance of continuous learning and staying current. They actively engage in online communities, follow tech blogs and forums, attend conferences and webinars, and explore relevant documentation and tutorials to keep their skills sharp and stay current with emerging trends and technologies.

Q5. What strategies do MERN stack developers employ for optimizing performance?

To optimize performance, MERN stack designers use various techniques such as code bundling and minification, server-side rendering for faster initial page loads, caching mechanisms, asynchronous programming, and employing CDNs (Content Delivery Networks) for efficient content distribution.

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Top Interview Questions to ask while hiring a MERN developer

The lifecycle of the component consists of four phases -

  • Initialization - The constructor() method is called before anything else when the component is initiated and sets up the initial state and other initial values. This method is called when your component is created but is not added to the DOM. Its main use is to initialize the state and bind this for component methods.
  • Mounting - The component is added to the React DOM. Mounting includes the following methods like constructor(), getDerivedStateFromProps(), render(), and componentDidMount().
  • Updating - The component receives changed props or states and is called when the components is re-rendered. Updating the component includes shouldComponentUpdate (), componentWillUpdate (), componentDidUpdate () methods.
  • Unmounting - The component is removed from the React DOM. It includes the method componentWillUnmount().

JSX stands for JSX stands for Javascript XML. This is a type of syntax extension which allows us to directly write HTML in React by converting HTML into React components, which helps you to easily create user interfaces for your web applications.

The virtual DOM is a programming concept where a virtual representation of UI is kept in memory and synced with the real DOM with the help of a library like ReactDOM. This process is called "Reconciliation".

Whenever any data is changed in UI, the changes are rendered in Virtual DOM first, then Virtual DOM is compared with Real DOM, the Real DOM will be updated only with the things that have been changed.

Props stand for Properties in React. Props are the read-only components generally used to render dynamically generated data. Props are passed in the functions as similar as the arguments are passed. Props are always sent from parent to child component and never vice-versa.

  • Props are immutable while the States are mutable.
  • Props allow you to pass information from one component to another in the argument form, while a State doesn't pass but holds the information about the components.
  • Props make a component reusable by passing it to the child component while States do not have any functionality like this.
  • Props are external and are controlled by whatever renders the component while the State is internal and is controlled by the React Component itself.
  • Props are used to communicate between the components, States can be used for rendering dynamic changes with the component.

Express.js is a robust framework of Node.js designed to minimize the lines of code while developing web applications by providing powerful set of libraries and tools which makes the development process faster and increases its scalability.

Routing specifies the way a server responds to a client's request to a particular endpoint. AN endpoint is a path and any of the HTTP methods such as GET, PUT, POST, PATCH, etc. Each route possesses one or more handler functions that gets executed when the router is matched. The syntax usually used for routing is - 

app.METHOD(PATH,HANDLER), where METHOD can be any HTTP request methods like GET, PUT, POST, DELETE, SET, OPTIONS, HEAD, and CONNECT.

To work with MongoDB, the required library is mongoose. The required steps for establishing database connectivity are - 

  • Connection Pooling – Specify the number of database connections that should be maintained and saved by Node.js.
  • Create the connection to a database. Create a callback function that can be invoked whenever the “create” method is executed.
  • To retrieve and manipulate data, execute queries from the database with the help of commands such as SELECT, UPDATE, INSERT, and DELETE.
  • Close the connection and create a callback function that can be invoked whenever the “close” method is executed.

Replication in MongoDB is a mechanism of creating the copy of data on multiple servers. It increases the data durability by ensuring that the data is written on multiple machines. In MongoDB, it is achieved by using replica sets. A replica set is a group of mongod objects / instances that maintains the same set of data. There are various data bearing nodes and one arbiter node which is optional. Only one of the data bearing nodes is treated as the primary node that receives all the write operations. The primary nodes stores all the changes occurred to its data sets in the operation log (oplog).

REST API is an Application Programming Interface that uses HTTP requests to GETPUTPOSTDELETE the data over www. The developers you are hiring should be well versed with the principles of REST – 

  • Stateless – 

The client sends the requests to the server containing all the necessary data to be dealt with. The data can be a query-string parameter, a part of URI, context body, and headers also. The URI uniquely identifies the resource and the body contains the information about the requesting resource’s state.

  • Client and Server – 

REST provides a uniform interface that separates the client from the server and helps in improving the UI portability across various platforms they use. It also increases the scalability of the server components.

  • Uniform Interface

REST API ensures uniformity throughout the application by defining four interface constraints –  Resource Identification, Resource Manipulation, Self-descriptive messages, Hypermedia.

  • Layered System 

REST provides a layered system architecture that limits the component behavior thereby ensuring stability. Layered system enables load balancing and enhances scalability by providing shared caches. It also helps in increasing the application’s security because components in each layer cannot communicate with the next immediate layer.

  • Cacheable

REST allows the client to download the applets and extend them via the interface to use in their applications.

Node.js uses asynchronous callbacks which are called at the completion of a given task. Asynchronous Callbacks are specified as function arguments while invoking a function which will start executing code in the background. When the background code stops running, async callbacks call the callback function to let the developers know about task completion.

A callback hell occurs when the freelance MERN developer resolves callback which is another callback which is yet in another callback. Using comments, splitting the large functions into smaller functions, using async / wait, and using promises can help preventing callback hell to occur. 

The developers can maintain separate blocks for piles of code and avoid writing code in deep nested structures.

For achieving transaction and locking, developers use the concept of nesting the documents which are also known as embedded or sub document. MongoDB achieves locking by using reader-writer locks which provides concurrent readers the facility to access a shared collection or database. For example, when locking is made on a collection (using X mode), then its corresponding lock and the global lock should be locked in the intent exclusive IX mode.

The worker thread is a continuous parallel thread responsible for handling CPU-intensive Javascript operations by sharing SharedArrayBuffer instances or by transferring ArrayBuffer instances. Unlike cluster or child_process, worker threads can share memory. Worker threads inherit the command line flags automatically from the running process and will preload the preload scripts same as the main thread. If the preload script launches a worker thread unconditionally, every thread that is newly created or technically 'spawned' will spawn another until the application crashes.

If you are trying to hire a Mern Full Stack Developer. Here is the Mern Full Stack Developer Job Description that you can use in your hiring.

Frequently Asked Questions

UltraGenius is one of the leading platforms for hiring remote talent and connecting developer and part-time developers with Silicon Valley businesses. We focus on finding the best talents who will perform extremely well and will be easily integrated into your teams. We filter out only the top 1% most skilled developers among the 20K+ developers who have applied on our platform. Candidates have to prove their self-reported experience by giving UltraGenius’ s skill tests.

UltraGenius first tests the developer’s skill set by conducting a two and half hour hiring test. Our hiring test judges a candidate on all aspects like aptitude, case study analysis, verbal and reasoning, coding questions based on data structures and algorithms, software engineering, system design, and more. Then, there is another round for the candidates who are selected from this round called “Higher-level Assessment Skill Test”, which is a video round that deeply analyzes developers’ major skills and asks questions about the projects they have worked upon.

Fill up the form which is on every hiring developers’ page and we will inform you once we select the top 1% MERN developers matching your job requirements.  After analyzing the candidates based on their resumes and two assessment tests, we provide you the feedback quickly. And if the developers selected by our team are fit for your job role, then we also provide the onboarding.

UltraGenius offers you only the most skilled developers who are top 1% among the 20K+ developers who have applied on our platform. After a rigorous selection and testing process, we sort out only the top candidates for you. You can check out UltraGenius’ s selection process for hiring MERN developers on

UltraGenius provides you the best facility to hire developers in more than 50 skills like React, Angular, Javascript, Node, Java, Python, Magento, Ruby On Rails, Golang, PHP, WordPress, .NET, Android, iOS, DevOps, Machine Learning, and many more.