Hire Express.js developers with UltraGenius

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Hire only the best express.js developers among the 20K+ engineers who have applied to UltraGenius


Express.js Developer

Rishabh is a software engineer having 7+ years of experience in developing full stack web applications using MERN (MongoDB-ExpressJS- ReactJS-NodeJS) stack.

Expert in






10 Years


Full Time


Express.js Developer

Mahesh is a software engineer having 3+ years of experience developing RESTful APIs and designed single-page and hybrid web applications with Express. He is also proficient in NoSQL databases.

Expert in






10 Years


Full Time


Part-time Express.js Developer

John is a software engineer having 10+ years of experience developing robust web applications using Javascript, Express.js, Node.js, and MongoDB and is an expertise using NPM.

Expert in






10 Years


Full Time

Hire best Express.js developers with UltraGenius

Express.js is a robust and flexible backend framework of Node.js which is helpful for the Express.js developers write clean and concise code. Express.js replaces thousands of lines of code by its powerful libraries and thereby streamlines the development process. Express allows you to quickly design and develop web applications and deploy them securely on a web server. Express automatically restarts the application if it gets crashed due to some reason. npm install express command is used to install express for a web application.

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

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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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Want to hire Haskell developers on your own? Here are the skills you must look for while hiring a Haskell developer

Hiring Express.js developers might be an intricate task for you if you are a non-technical manager. Haskell is one of the well known languages used for research purposes and implementing functional programming in applications, and hiring the most skilled Express.js developers among thousands of developers is a challenging task for anyone. So, UltraGenius is here to assist you while recruiting the top talented Express.js developers on your own. UltraGenius understands your job requirements and gets you only the top developers who have in-depth knowledge of software development.

The following skills you must look for while hiring a Express.js developer – 

Steadfast knowldege of HTML and CSS

Knowledge of HTML (Hypertext Markup Language) and CSS (Cascading Style Sheets) is very important for a Express.js developer. You must hire best Express.js developer who has practiced and worked deeply with these technologies. Knowledge of Flexbox and CSS Grid, in addition to Bootstrap, Semantic and Structural Styling, and Foundation is a must to a Express.js developer. Along with this, hire the best Express.js developer who is well-versed in Javascript libraries especially jQuery and CSS grid systems. 

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Javascript fundamentals + ES6

Javascript is most widely used language in developing dynamic web applications and helps Express.js developers integrate back-end with the front-end easily. You must hire the best Express.js developers who are clear with the fundamental concepts of Javascript language. ECMAScript 6 (or ES6) is the current version of ECMAScript and is widely used by developers up to a large extent. The Express.js developers must know the following ES6 core features   –  

  • Arrow functions
  • Blocked scope constructors let and const
  • Advanced object literals
  • Template literals
  • Multi-line strings
  • Modules
  • Module loaders
  • Binary and octal literals
  • Reflect API
  • Proxies
  • Classes
  • Destructuring assignment

CSS Pre-processors and Frameworks

A CSS pre-processor is a program that extends the functionality of CSS and compiles it into regular CSS. SASS, PostCSS, SCSS, and LESS are the extensions of regular CSS and developers use them for useful functions such as math functions, color manipulation, to write better inline documentation, to easily integrate CSS tools and CSS codebase, and much more. It makes developers write lines of code in very less time because of its in-built functionalities.

You must check the Express.js developer’s knowledge of Bootstrap and Material UI, as these components streamlines the development process and ensures that a web application looks best.

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Knowledge of Express.js frameworks

Express frameworks are widely used for designing mobile and several dynamic web applications. Hire Express.js developers based on their familiarity with these frameworks – Locomotive, Blueprint, NestJS, KeystoneJS (inbuilt auto-generated React.js admin UI), LoopBack, Kites, Dinoloop, Kites, FoalTS, and Expressive Tea.

Proficient using Version Control System like Git, SVN, and Mercurial

Express.js developers must possess very good knowledge of version control systems, like Git, SVN, TFS, and Mercurial. Mostly, developers use Git for their work. It is the version control system that helps the team in collaborating and organizing your code, maintain the frequent changes that occur in the code. Git helps in reviewing the old codes and compares them with the newly updated code, pulling the code from their repository, and managing the commit history.

Along with this, the Express.js developers developer must know how to use add, push, pull, and commit commands, branching, and merging as it allows developers to work independently on the code.

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Excellent understanding of testing frameworks and tools

Rising quick-deployment needs during the development phase, testing has become the most demanding skills for a Express.js developer. Therefore, Express.js developers must have knowledge of Jest, Enzyme, Mocha, Chai, AVA, and Tape for unit testing. For end-to-end testing, they must know about Selenium, Webdriver, Cucumber.js, Nightwatch.js, Cypress, and Puppeteer. For integration testing, they must know about Karma.

Excellent grasp on Node.js

As Express.js is a framework built on NodeJS, Express.js developers must have excellent understanding of NodeJS. NodeJS is a Javascript backend runtime environment built on the Chrome V8 engine and executes Javascript code independent of the web browser. Node.js is mainly used for non-blocking Input/Output programming. Its single-threaded nature makes it very fast for developing web applications. It is used for backend services and generating dynamic content on the webpage. NodeJS can gather form data and perform CRUD ( Create, Read, Update, and Delete ) operations and easily modifies data in the database. 

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Knowledge of front end technologies like React or Angular

Express.js developers must know about front end technologies and frameworks particularly React.js or Angular.js. These front-end frameworks are greatly required in today’s market. React is popular for its faster development of Single Page Applications while Angular uses interpolation, dependency injection, and eliminates coding mistakes by using the strongly typed Typescript that resolves many challenges faced by the developers.

Ability to cross browser compatible code

You must hire the Express.js developers based on their ability to write cross browser platform compatible code. Cross-browser compatibility drives the best user experience which increases the usability of your web applications. 

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Knowledge of establishing connection with databases

As Express.js serves backend purposes, the Express.js developer must know how to establish database connection in the server.js file. For example, if the database is MongoDB, then the following steps are used for connecting  server with MongoDB using mongoose library. 

const mg = require (‘mongoose’);

mg.connect(“mongodb://”, {

useNewUrlParser : true;

useUnifiedTopology : true;

useCreateIndex : true;


Experience working with databases like MySQL and MongoDB

Express.js developers must have hands-on experience with databases like MySQL or PostgreSQL, MongoDB or Cassandra. For developing real-world web applications, the developer should be experienced with at least one of the databases, MongoDB, MySQL, and PostgreSQL. These databases can store the content in any type of format and are frequently used with NodeJS.  To work with MongoDB, the required library is mongoose and for working with MySQL, the required library is mysql. The necessary operations to perform with these modules 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.
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Experience with web markup and UI, UX Concepts

Hire Express.js developers who possess a strong understanding of element positioning, displaying the elements, and making components interactive, semantic markup, and other related UX Concepts so they can design the product with the best quality. The developer must be experienced in developing visual effects in presentational markup. For, example – How the heading appears, making text larger and putting weight to it, and giving which color to it, and which markup can include captions, bind columns, and row headings to table cells. 

Firm understanding of RESTful web APIs

REST API is a very popular Application Programming Interface that uses HTTP requests to GETPUTPOSTDELETE the data over www. Hire Express developers based on their knowledge of REST APIs – 

  • 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.

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Proficient in writing optimized and readable code

To streamline the development process,  the Haskell developers must be proficient writing clean and high-performance optimized code that is understandable by all the team members.

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Connect with the top 1% Express.js developers of the world at the lowest prices

Express is very popular developing robust APIs using its HTTP utility methods, core middleware, and libraries like socket.io, body-parser, CORS, axios, multer, and many more. But recruiting the best Haskell developers is not an easy task when a large no. of Haskell developers are competing to grab the job opportunities.

Top Interview Questions to ask while hiring a Express.js developer

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. 

Following are the advantages of using Express.js framework - 

  • Provides high performance and rapid application development because of its non-blocking I/O, asynchronous programming and single-thread feature.
  • Easy to customize and use.
  • Contains multiple middleware components and HTTP utility methods which quickens API development and is widely used for request and response methods.
  • Easy third-party integration with template engines like Jade, Vash, EJS, etc.
  • Quickly identifies middleware handling error.
  • Enables developers design the backend server easily with REST API(s).
  • Express uses middleware to establish communication and manage data on the server-side.
  • Manages application's static files and services easily.
  • Fast linking to databases like MySQL, MongoDB, and Postgres.

Middleware in Express.js are the functions that can access request and response object for each path it is attached to. This chaining of middleware enables freelance Express.js developers to create reusable middleware and separate one part of code from other code. Freelance Express.js developers can modify the data or invoke the next middleware with the help of middlewares.

Following is the list of middlewares in Express.js - 

  • Application-level middleware - It uses the app.use() and app.METHOD() to bind the instance of the application object with the application-level middleware.
  • Router-level middleware - The working of router-level middleware is similar to that of application-level middleware except it binds the object of express.Router().
  • Error Handling Middleware - Error Handling Middleware enables Express.js freelance developers to compartmentalize error logic with other code and respond accordingly. 
  • Built-in middleware -Built-in middleware has inbuilt components and tools for processing data. express.json parses the given file with JSON payload, express.static provides static functionality for HTML, CSS, and images files, and express.urlencoded parses the requests with URL encoded payloads. 

CORS stands for Cross-Origin Resource Sharing. CORS allows freelance Express developers to request data from one website to another website in the browser which is prohibited normally because of the Same-Origin Policy (SOP). Moreover, the website can access numerous functionalities  and resources from a different site domain.

var exp = require ('express');

var data = express();

var body_parser = require('body-parser');

var urlEncodedParser = bodyParser.urlencoded({extended : false});

data.post('/process_post', urlEncodedParser, function (req,res){

response = {

firstName = req.body.firstName,

lastName = req.body.lastName






There are two ways of configuring the properties in ExpressJS - 

  • Using require.js - A file with config.json name is created in the config folder which is present inside project folder.
  • Using process.env- A file named .env is created in the project folder and all the properties are added in this file and any of them can be used in server.js file.

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, OPTIONS, HEAD, and CONNECT.

Scaffolding allows us to create the structure layout for an application. Scaffolding allows a freelance Express.js developer create a public directory for an application, add middlewares to an application, create separate route files, and much more. In Node.js, the tool used for scaffolding is Yeoman, which uses generators to create a simple structure for your application.

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 Haskell developers’ major skills and asks questions about the projects they have worked upon.

Fill up the form which is on every hiring developer’s page and we will inform you once we select the top 1% Express.js 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 freelancers 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 best  Express developers on https://www.ultragenius.club/hire-express-freelancer/.

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.