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Oleh P., Node.js Engineer

Last Updated: 31 Oct 2023

- More than 4 years of professional experience in web development and database design. - A team player focused on achieving project objectives with speed and accuracy. - Experienced in full project life cycle from design to implementation to integration. - Upper-Intermediate English

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Node.js   5 yr.

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Vitaliy M., JavaScript Software Engineer (Node.js)

Last Updated: 4 Jul 2023

• Software Engineer with 6+ years of experience in software development based on backend technologies (Node.js, ExtJS, PHP /Symfony/). • Experience in next stages of the life cycle of development of business applications. Architecture design, planning, estimation, investigation, development, writing tests, support of existing code. • Understanding of relational database concepts, modular application architectures, design patterns • Development of project architecture, algorithms and models on customer requirements

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Nikolay Cherlenok, Node.js developer / Back-end

Minsk, Belarus
Last Updated: 4 Jul 2023

I have 4+ years of IT experience. Solid development experience with heavy web apps with a focus on Angular and Node.js

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JavaScript   4 yr.


Node.js   4 yr.


Bootstrap   4 yr.


MongoDB   4 yr.

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Daniil G., Full-Stack Software Engineer (React + Node.js)

Last Updated: 4 Jul 2023

- 4+ years of experience in the IT industry as a full-stack engineer - FRONT-END: deep knowledge of JavaScript, ES6+, React, Redux, other React tools (Redux-Thunk, React-query, etc.), Material-UI, HTML5, CSS3, BEM, LESS, SASS, Bootstrap, Webpack, Vite, Jest, Lodash - BACK-END: Node.js, Typescript, Express.js, NestJS, REST API, Postgres, Docker, Google, Facebook auth - Intermediate English - Available ASAP

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Mykyta K., Full-stack Software Engineer (React + Node.js)

Lviv, Ukraine
Last Updated: 4 Jul 2023

- 5+ years of professional experience using front-end and back-end technologies - Front-end: Deep knowledge of native JavaScript (basics, OOP, DOM, events, asynchrony, AJAX, event loop), ES6+, React, Redux, other React tools (React-router, Redux-Saga, etc.), HTML5, CSS3, LESS, SASS, Bootstrap, Material-UI. - Back-end: Node.js, Express.js, NestJS, JWT, REST API, GraphQL, Postgres, Sequelize, Typeorm, knex.js, Docker, Microservices. - Upper-Intermediate English - Available in 2 weeks after approval for the project

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Table of Contents

Soft skills of a Node.js Developer

Soft skills are crucial for a Node.js Developer as they enhance collaboration, communication, and productivity in a team-based environment.


  • Effective Communication: Ability to clearly convey ideas and ask questions to team members and stakeholders.
  • Adaptability: Willingness to learn and embrace new technologies and frameworks.
  • Problem-solving: Capability to identify and resolve issues in code efficiently.
  • Time Management: Capacity to prioritize tasks and meet deadlines.
  • Teamwork: Collaboration with team members to achieve project goals.


  • Leadership: Ability to take ownership of tasks and guide junior developers.
  • Conflict Resolution: Skill to handle conflicts and facilitate effective communication within the team.
  • Mentoring: Willingness to share knowledge and provide guidance to junior developers.
  • Critical Thinking: Capability to analyze complex problems and propose innovative solutions.
  • Attention to Detail: Ability to thoroughly review code for quality assurance.
  • Client Management: Skill to communicate effectively with clients and understand their requirements.
  • Agile Methodology: Familiarity with agile practices and ability to adapt to changing project requirements.


  • Strategic Thinking: Ability to align technical decisions with overall project goals.
  • Project Management: Skill to plan, execute, and deliver projects within specified timelines.
  • Empathy: Understanding and considering the perspectives of team members and stakeholders.
  • Decision-making: Capability to make informed decisions based on technical expertise and project requirements.
  • Presentation Skills: Effective communication of technical concepts to non-technical stakeholders.
  • Code Review: Expertise in conducting thorough code reviews and providing constructive feedback.
  • Collaboration: Building strong relationships with cross-functional teams to drive project success.
  • Continuous Learning: Commitment to staying updated with the latest technologies and industry trends.

Expert/Team Lead

  • Strategic Planning: Ability to develop long-term technical strategies for the team.
  • Team Management: Skill to lead and motivate a team of developers towards project success.
  • Client Relationship Management: Establishing and maintaining strong relationships with clients.
  • Innovation: Driving innovation within the team and exploring new technologies.
  • Conflict Management: Skill to handle conflicts and facilitate resolution within the team.
  • Technical Vision: Developing and communicating a clear technical vision for the project.
  • Performance Optimization: Expertise in optimizing code and improving application performance.
  • Code Architecture: Designing scalable and maintainable code architecture for complex projects.
  • Quality Assurance: Ensuring high-quality code standards and implementing best practices.
  • Knowledge Sharing: Promoting knowledge sharing within the team and across the organization.
  • Strategic Partnerships: Building strategic partnerships with external stakeholders.


Let’s consider Difference between Junior, Middle, Senior, Expert/Team Lead developer roles.

Seniority NameYears of experienceResponsibilities and activitiesAverage salary (USD/year)
Junior0-2 yearsAssisting with basic coding tasks, bug fixing, and testing. Learning and acquiring new skills under the guidance of senior developers. Working on smaller projects within a team.$50,000 – $70,000
Middle2-5 yearsDeveloping software components and modules. Collaborating with other team members and supporting junior developers. Participating in code reviews and ensuring code quality. Working on medium-sized projects with moderate complexity.$70,000 – $90,000
Senior5-10 yearsLeading and architecting complex software projects. Mentoring and guiding junior and middle developers. Making important technical decisions and providing technical expertise. Collaborating with other teams and stakeholders. Ensuring high-quality code and system performance.$90,000 – $120,000
Expert/Team Lead10+ yearsLeading development teams and managing projects. Setting technical direction and making strategic decisions. Mentoring and coaching other developers. Collaborating with stakeholders to define project requirements and priorities. Ensuring overall project success and delivering high-quality software solutions.$120,000 – $150,000+


What are top Node.js instruments and tools?

  • Express.js: Express.js is a fast, unopinionated, and minimalist web application framework for Node.js. It was released in 2010 and has since become one of the most popular frameworks for building web applications. Express.js provides a simple and flexible way to handle HTTP requests and build APIs, making it ideal for creating both small and large-scale web applications. It also supports various plugins and middleware, allowing developers to extend its functionality as needed.
  • Socket.io: Socket.io is a real-time communication library for Node.js that enables bidirectional event-based communication between the server and the client. It was first released in 2010 and has since gained popularity for its ease of use and wide range of features. Socket.io uses websockets by default but can also fallback to other transport mechanisms like long polling or HTTP streaming, ensuring compatibility across different browsers and network environments. It is widely used in applications that require real-time updates, such as chat applications, collaborative tools, and online gaming platforms.
  • PM2: PM2 is a production process manager for Node.js applications. It was introduced in 2013 and has become a popular choice for managing Node.js applications in production environments. PM2 provides features like automatic application restarts, load balancing, and memory management, making it easier to deploy and scale Node.js applications. It also offers monitoring capabilities and integrates with popular logging and monitoring tools, allowing developers to keep track of the application’s performance and troubleshoot issues effectively.
  • Sequelize: Sequelize is an Object-Relational Mapping (ORM) library for Node.js that provides an abstraction layer for interacting with relational databases. It was first released in 2011 and has gained popularity for its simplicity and extensive feature set. Sequelize supports multiple database systems such as MySQL, PostgreSQL, SQLite, and MSSQL, making it a versatile choice for working with different databases. It offers features like data validation, eager loading, and transaction support, simplifying the process of working with databases in Node.js applications.
  • Webpack: Webpack is a module bundler for JavaScript applications. It was first released in 2012 and has become a standard tool in the Node.js ecosystem for bundling and optimizing web applications. Webpack allows developers to bundle not only JavaScript files but also other assets like CSS, images, and fonts, enabling a modular and efficient development workflow. It supports code splitting, lazy loading, and tree shaking, which help reduce the size of the bundled code and improve performance. Webpack also integrates with various plugins and loaders, providing additional functionalities like code minification, asset optimization, and hot module replacement.
  • Jest: Jest is a JavaScript testing framework for Node.js applications. It was developed by Facebook and released in 2014. Jest provides an easy-to-use and intuitive interface for writing and running tests, making it a popular choice among developers. It offers features like test coverage reporting, snapshot testing, and parallel test execution, which help ensure the quality and reliability of Node.js applications. Jest also integrates well with other tools and libraries, such as Babel and TypeScript, allowing developers to write tests using modern JavaScript features and syntax.
  • Nodemon: Nodemon is a utility tool for Node.js development that automatically restarts the application whenever file changes are detected. It was first released in 2011 and has become a go-to tool for developers who want to streamline their development workflow. Nodemon eliminates the need to manually restart the server every time a file is modified, saving time and improving productivity. It supports watching files in specific directories and can be easily configured to ignore certain files or directories. Nodemon is widely used in development environments to speed up the iterative development process.
  • GraphQL: GraphQL is a query language and runtime for APIs that was developed by Facebook and released in 2015. It provides a flexible and efficient way to define, query, and manipulate data in APIs. GraphQL allows clients to specify the exact data they need, reducing over-fetching and improving performance. It also supports real-time updates through subscriptions, making it suitable for applications that require real-time data synchronization. GraphQL has gained popularity in the Node.js community due to its declarative syntax, introspection capabilities, and strong type system.
  • Mongoose: Mongoose is an Object Data Modeling (ODM) library for MongoDB and Node.js. It was first released in 2010 and has become a widely used tool for working with MongoDB in Node.js applications. Mongoose provides a straightforward way to define data schemas, perform CRUD operations, and perform advanced querying on MongoDB collections. It also offers features like data validation, middleware hooks, and schema-based transformations, making it easier to work with complex data structures. Mongoose helps developers streamline the interaction between Node.js and MongoDB, enabling efficient data modeling and manipulation.
  • Axios: Axios is a popular HTTP client library for Node.js and browser environments. It was released in 2014 and has gained widespread adoption due to its simplicity and ease of use. Axios provides a simple API for making HTTP requests, supporting features like request cancellation, interceptors, and automatic JSON parsing. It can be used to communicate with RESTful APIs and perform various HTTP operations like GET, POST, PUT, and DELETE. Axios also has built-in support for handling errors and timeouts, making it a reliable choice for interacting with external APIs in Node.js applications.


How and where is Node.js used?

Case NameCase Description
NetflixNode.js is used by Netflix to handle its vast amount of streaming data. With Node.js, Netflix can process thousands of concurrent connections and deliver real-time updates to users. It helps in reducing buffering time and provides a smooth streaming experience.
UberNode.js plays a vital role in Uber’s backend infrastructure. It enables real-time data synchronization between drivers and riders, ensuring efficient ride matching and tracking. Node.js also helps in handling the high volume of requests and supports quick response times.
LinkedInLinkedIn utilizes Node.js for various purposes, including their mobile backend and real-time notifications. Node.js allows LinkedIn to handle a large number of concurrent connections and deliver real-time updates to users, ensuring a seamless user experience.
WalmartNode.js powers Walmart’s mobile application, allowing customers to browse products, add them to the cart, and make purchases. With Node.js, Walmart can handle a massive amount of traffic, provide fast response times, and deliver an excellent user experience.
NASANode.js is used by NASA for various projects, including their data-intensive applications. It enables real-time monitoring and processing of data from satellites, telescopes, and other space missions. Node.js helps NASA in handling complex calculations and delivering accurate results.
PayPalNode.js is a core part of PayPal’s infrastructure, powering their web and mobile applications. It enables real-time transaction processing, fraud detection, and secure payment handling. Node.js helps PayPal in providing a reliable and secure payment platform.
MediumMedium, a popular online publishing platform, relies on Node.js for its backend services. Node.js allows Medium to handle a large number of concurrent users, process requests quickly, and deliver a seamless reading experience to its users.
TrelloTrello, a popular project management tool, uses Node.js to handle real-time updates and collaboration between team members. It enables smooth synchronization of data across devices and ensures that changes are reflected instantly for all users.
GoDaddyNode.js is utilized by GoDaddy for their website builder platform. It allows users to create and customize websites using a simple drag-and-drop interface. Node.js enables real-time preview and updates, making website building a seamless experience for users.
YahooYahoo uses Node.js for various purposes, including their Yahoo Mail backend. It enables efficient handling of email requests, real-time notifications, and synchronization across devices. Node.js helps in delivering a reliable and responsive email service to millions of users.


TOP 14 Facts about Node.js

  • Fact 1: Node.js is an open-source, cross-platform JavaScript runtime environment that allows developers to build server-side and networking applications.
  • Fact 2: Node.js uses an event-driven, non-blocking I/O model, making it efficient and lightweight for handling concurrent requests.
  • Fact 3: Node.js was initially released in 2009 by Ryan Dahl and has since gained significant popularity among developers worldwide.
  • Fact 4: The package manager for Node.js is called npm (Node Package Manager), which hosts over 1.4 million packages as of October 2021.
  • Fact 5: Node.js allows developers to write server-side applications using JavaScript, a language traditionally associated with client-side scripting.
  • Fact 6: Node.js is built on the V8 JavaScript engine, which is developed by Google and powers popular web browsers like Chrome.
  • Fact 7: Node.js provides a rich set of built-in modules, such as HTTP, File System, and Crypto, making it easy for developers to handle various tasks.
  • Fact 8: Many major companies, including Netflix, LinkedIn, and Walmart, have adopted Node.js for their backend infrastructure, highlighting its scalability and performance.
  • Fact 9: Node.js has a vibrant ecosystem with a large number of frameworks and libraries available, such as Express.js, Socket.io, and Sequelize.
  • Fact 10: Node.js is well-suited for real-time applications, such as chat systems and collaborative tools, due to its event-driven architecture.
  • Fact 11: The Node Package Manager (npm) allows developers to easily manage dependencies and share reusable code, fostering collaboration within the community.
  • Fact 12: Node.js has a strong community support with active forums, online tutorials, and conferences, making it easy for developers to find help and stay updated.
  • Fact 13: Node.js can be used to build not only web applications but also desktop applications using frameworks like Electron.
  • Fact 14: According to the Stack Overflow Developer Survey 2021, Node.js is one of the most loved and widely used frameworks among professional developers.


Pros & cons of Node.js

6 Pros of Node.js

  • 1. High Performance: Node.js is built on Google Chrome’s V8 JavaScript engine, which provides exceptional performance. It uses an event-driven, non-blocking I/O model, making it highly efficient for handling concurrent requests.
  • 2. Scalability: Node.js is designed to handle a large number of concurrent connections with minimal overhead. It uses a single-threaded, event-driven architecture that allows it to handle thousands of concurrent connections without consuming excessive server resources.
  • 3. JavaScript Everywhere: Node.js allows developers to use JavaScript on both the client-side and server-side, enabling full-stack JavaScript development. This reduces the need for context switching between different programming languages and simplifies the development process.
  • 4. Rich Ecosystem: Node.js has a vibrant and active community that has developed a wide range of modules and libraries, known as the Node Package Manager (NPM). This extensive ecosystem provides developers with ready-to-use tools and solutions to speed up development.
  • 5. Real-time Applications: Node.js is particularly well-suited for building real-time applications, such as chat applications, collaborative tools, and streaming applications. Its event-driven architecture allows for fast and efficient handling of real-time data.
  • 6. Easy Scalability: With Node.js, horizontal scalability is relatively straightforward. It can be easily scaled across multiple servers using load balancing techniques, making it an ideal choice for applications that need to handle high traffic loads.

6 Cons of Node.js

  • 1. Single-threaded: While Node.js’ single-threaded architecture provides high scalability and performance for handling concurrent connections, it also means that it cannot fully utilize multiple CPU cores. CPU-intensive tasks can become a bottleneck in Node.js applications.
  • 2. Callback Hell: Asynchronous programming in Node.js heavily relies on callbacks, which can lead to complex and nested code structures. This can make the code harder to read, understand, and maintain, especially for developers who are new to asynchronous programming.
  • 3. Limited Standard Library: Node.js has a relatively small standard library compared to other platforms. This means that developers often rely on external modules from the NPM ecosystem, which may vary in quality and stability.
  • 4. Immaturity of Some Libraries: While the NPM ecosystem offers a wealth of modules, not all of them are equally mature and well-maintained. Developers need to carefully evaluate the quality, stability, and community support of the modules they choose to use.
  • 5. Debugging: Debugging Node.js applications can be challenging, especially when dealing with complex asynchronous code. Tools like the Node.js built-in debugger and third-party options are available, but they may require additional setup and configuration.
  • 6. Learning Curve: Node.js has its own set of concepts and best practices, which may be unfamiliar to developers coming from other backgrounds. Learning and mastering these concepts, such as event-driven programming and non-blocking I/O, can take time and effort.


TOP 10 Node.js Related Technologies

  • JavaScript

    JavaScript is the fundamental language for Node.js development. It is a versatile and widely adopted programming language that allows developers to create dynamic and interactive web applications.

  • Express.js

    Express.js is a fast and minimalist web application framework for Node.js. It provides a robust set of features for building web applications and APIs. With its simplicity and scalability, Express.js is a popular choice among Node.js developers.

  • React.js

    React.js is a JavaScript library for building user interfaces. It allows developers to create reusable UI components and build complex UIs efficiently. With its virtual DOM and component-based architecture, React.js is widely used in Node.js development.

  • MongoDB

    MongoDB is a popular NoSQL database that is commonly used with Node.js. It offers high performance, scalability, and flexibility, making it an excellent choice for handling large amounts of data in Node.js applications.

  • Socket.io

    Socket.io is a JavaScript library that enables real-time, bidirectional communication between web clients and servers. It is widely used in Node.js development for building chat applications, online gaming platforms, and collaborative tools.

  • Webpack

    Webpack is a module bundler for JavaScript applications. It allows developers to bundle and optimize their Node.js code, making it more efficient and easier to manage. With its extensive plugin system, Webpack is a popular choice for building Node.js applications.

  • Docker

    Docker is a platform that allows developers to build, package, and distribute applications as containers. It provides a consistent and isolated environment, making it easier to deploy and scale Node.js applications across different environments.


Cases when Node.js does not work

  1. Memory Intensive Applications: Node.js may not be suitable for memory intensive applications where the application requires a large amount of memory to process data. Since Node.js runs on a single thread, it has a limited memory space, and memory-intensive tasks can lead to performance issues or crashes.
  2. CPU-Intensive Applications: While Node.js is efficient for handling concurrent requests, it may not be the best choice for CPU-intensive tasks. Since Node.js runs on a single thread, it is not optimized for heavy computations that require multi-threading. In such cases, other languages like Java or C++ may be more suitable.
  3. Blocking Operations: Node.js is designed to handle non-blocking I/O operations, making it ideal for building scalable and responsive network applications. However, if an application heavily relies on blocking operations, such as synchronous file system operations or database queries, it can lead to a decrease in overall performance. In these cases, it might be better to consider using a language or framework that is better suited for blocking operations.
  4. Real-time Applications with Heavy Payloads: While Node.js is well-suited for building real-time applications, it may not be the best choice for applications that deal with heavy payloads. As Node.js runs on a single thread, processing large amounts of data in real-time can put a strain on the server and potentially impact performance.
  5. Legacy Systems: If you are working with legacy systems that are built on a different technology stack, it might be challenging to integrate Node.js seamlessly. This could be due to dependencies on specific libraries or frameworks that are incompatible with Node.js or require significant modifications to work together.


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