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Oleksii, Senior JavaScript Full-Stack Engineer

Last Updated: 2 Apr 2024
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- 10+ years of experience in web development, M.Sc in Software Engineering - Mastery of JavaScript and its associated frameworks and libraries, such as React, Angular, and Vue.js for front-end; Node.js, Next.js for back-end and React Native for mobile app development. - Experience with PHP and Cloud infrastructure such as AWS. - Proficiency in using version control systems (e.g., Git) and familiarity with DevOps practices for continuous integration and deployment (CI/CD). - Implementing and overseeing testing processes, including unit testing, integration testing, and end-to-end testing. - Experience leading and mentoring a team of developers, including assigning tasks, providing guidance, and ensuring the team's success. Ability to motivate and inspire team members, resolve conflicts, and provide constructive feedback. - Experience conducting assessments and interviews remotely.

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JavaScript   8 yr.


React   8 yr.


TypeScript   5 yr.


Node.js   5 yr.


Next.js   3 yr.

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Eugene K., Senior NodeJS Engineer

Lviv, Ukraine
Last Updated: 4 Jul 2023

- Proficient in Node, Typescript, and Express, with experience in multiple backend development roles, working on projects related to education, healthcare, and SEO optimization. - Utilized tech stack including Nest.js, PostgreSQL, TypeORM, Redis, GCP, REST, and WebSockets while developing platforms for physicians and improving healthcare services. - Successfully integrated ElasticStack and implemented admin panels for SEO entities in a platform designed for automated SEO optimization. - Developed and maintained microservices for a healthcare company, focusing on notifications, messages, calls, and emails, utilizing technologies such as Express, Nest.js, MySQL, MongoDB, Sequelize, and Firebase. - Consistently prioritized efficient workflows and high test coverage, introducing git flow strategies and achieving 90% unit test coverage in microservices. - Upper-Intermediate English - Available ASAP

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Dennis S., SDET/Automation QA Engineer (Java)

Kharkiv, Ukraine
Last Updated: 4 Jul 2023

- 3.5+ Years of software testing experience - WEB UI Automated Testing - API Automated Testing (SOAP / RESTful / WebSocket ) - Software Development Engineer in Test / Quality Assurance / CI&CD starter. - Intermediate English - Available ASAP

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QA Automation

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Sean Boland, Senior Software Engineer

New York City, United States
Last Updated: 6 Mar 2024










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Dmitriy, React Engineer

Last Updated: 4 Jul 2023

- 4+ years of experience in IT - Upper-Intermediate English. - Available ASAP

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React Native

React Native



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Our journey starts with a 30-minute discovery call to explore your project challenges, technical needs, and team diversity. Meet Carefully Matched WebSockets Talents. Within 1-3 days, we’ll share profiles and connect you with the right talents for your project. Schedule a call to meet engineers in person. Validate Your Choice. Bring a new WebSockets developer on board with a trial period to confirm that you’ve hired the right one. There are no termination fees or hidden costs.

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Upstaff Managers conduct an introductory round with potential candidates to assess their soft skills. Additionally, the talent’s hard skills are evaluated through testing or verification by a qualified developer during a technical interview. The Upstaff Staffing Platform stores data on past and present WebSockets candidates. Upstaff managers also assess talent and facilitate rapid work and scalability, offering clients valuable insights into their talent pipeline. Additionally, we have a matching system within the platform that operates in real-time, facilitating efficient pairing of candidates with suitable positions.

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Table of Contents

Cases when WebSockets does not work

  1. Firewalls and Proxies: WebSockets may not work properly if there are firewalls or proxies in place that block WebSocket connections. Some network setups may prevent the WebSocket handshake from taking place or interrupt the connection, leading to failure.
  2. Unsupported Browsers: Older web browsers may not support WebSockets or may have limited support. For example, Internet Explorer versions prior to IE10 do not support WebSockets at all, while some older versions of Firefox and Safari have limited support.
  3. WebSocket Server Issues: If the WebSocket server is not properly configured or has encountered a problem, it may not be able to establish a connection with the client. Server misconfiguration, software bugs, or resource limitations can all lead to WebSocket failures.
  4. Network Connectivity: Poor network connectivity or intermittent connection issues can disrupt WebSocket communication. If the network connection is unstable or frequently drops, WebSocket connections may not be able to establish or maintain a connection.
  5. JavaScript Disabled: WebSockets rely on JavaScript to function on the client-side. If JavaScript is disabled in the browser settings or by a browser extension, WebSocket connections will not be possible.
  6. Domain Restrictions: Some domains may have restrictions in place that prevent WebSocket connections from being established. This could be due to security policies, cross-origin restrictions, or other domain-specific configurations.
  7. Load Balancers and Proxies: In certain load balancer or proxy configurations, WebSocket connections may not be properly handled or forwarded. Improper load balancing or proxy settings can interfere with WebSocket communication.

TOP 13 Facts about WebSockets

  • WebSockets is a communication protocol that provides full-duplex communication between a client and a server over a single TCP connection.
  • It allows real-time communication between web browsers and servers, enabling data to be transmitted instantly without the need for constant polling or refreshing of the web page.
  • Unlike traditional HTTP connections that follow a request-response model, WebSockets enable bi-directional communication, where both the client and server can send data to each other at any time.
  • The WebSocket protocol is standardized by the Internet Engineering Task Force (IETF) as RFC 6455.
  • WebSockets use a persistent connection, eliminating the overhead of establishing a new connection for each request, resulting in reduced latency and improved performance.
  • It supports a wide range of applications, including chat applications, real-time collaboration tools, stock market tickers, multiplayer games, and more.
  • WebSockets can be implemented in various programming languages, including JavaScript, Python, Java, C#, and more, making it accessible for developers using different technologies.
  • WebSocket connections are initiated by an HTTP handshake, which allows compatibility with existing web infrastructure and firewalls.
  • WebSockets can operate over secure SSL/TLS connections, ensuring data privacy and security.
  • It provides a standardized messaging protocol, allowing developers to send and receive data in a structured format, such as JSON or XML.
  • WebSockets support event-driven architecture, where the server can push updates to the connected clients without them explicitly requesting the data.
  • It enables real-time updates and notifications, enhancing the user experience by delivering timely information without the need for manual refreshing of the web page.
  • WebSockets have wide browser support, with major modern browsers, including Chrome, Firefox, Safari, and Edge, offering native support for the WebSocket API.

What are top WebSockets instruments and tools?

  • Socket.IO: Socket.IO is a JavaScript library that enables real-time, bidirectional communication between web clients and servers. It was first released in 2010 and has become one of the most widely used WebSockets libraries. Socket.IO provides a simple and reliable way to build real-time applications such as chat, gaming, and collaborative tools.
  • SignalR: SignalR is a popular real-time application framework for .NET developers. It was introduced by Microsoft in 2013 and has since gained significant adoption. SignalR supports WebSockets as well as other transport mechanisms like Server-Sent Events and long polling. It provides a high-level API for building real-time features in ASP.NET applications.
  • STOMP: STOMP (Simple Text Oriented Messaging Protocol) is a lightweight messaging protocol that can be used with WebSockets. It was designed to provide a simple and interoperable way for clients and servers to exchange messages. STOMP has been widely used in messaging systems and is supported by various WebSocket libraries and frameworks.
  • Autobahn|Python: Autobahn|Python is a WebSocket library for Python that provides both client and server implementations. It is built on top of the Twisted networking framework and offers a high-level API for working with WebSockets. Autobahn|Python has been actively maintained since 2011 and is known for its performance and reliability.
  • Phoenix Channels: Phoenix Channels is a real-time communication library for Elixir, a functional programming language built on the Erlang virtual machine. It was introduced as part of the Phoenix web framework in 2015. Phoenix Channels leverages WebSockets to enable real-time features in Elixir applications and has gained popularity in the Elixir community.

How and where is WebSockets used?

Case NameCase Description
Real-time Chat ApplicationsWebSockets are widely used in developing real-time chat applications. With WebSockets, messages can be sent and received instantly without the need for constant page refreshing. This allows for seamless communication between users, making chat applications more interactive and efficient.
Collaborative EditingWebSockets are ideal for building collaborative editing tools. Multiple users can simultaneously edit a document or work on a project in real-time. WebSockets enable instant updates and synchronization, ensuring that all participants see the changes made by others without any delays.
Real-time NotificationsWebSockets are commonly used to deliver real-time notifications to users. Whether it’s new messages, updates, or alerts, WebSockets provide a fast and efficient way to push notifications instantly to connected clients. This ensures that users are always up-to-date without the need for manual refreshes.
Live Sports ScoreboardsWebSockets are utilized to create live sports scoreboards that display real-time scores and updates. With WebSockets, scores can be updated in real-time without the need for manual refreshes, providing an immersive experience for sports fans who want to stay updated on the latest game developments.
Online GamingWebSockets play a crucial role in online gaming applications. Whether it’s multiplayer games or real-time strategy games, WebSockets enable real-time communication between players, allowing for interactive gameplay and synchronized actions. This enhances the overall gaming experience and eliminates the need for frequent page reloads.
Stock Market UpdatesWebSockets are used to deliver real-time stock market updates to traders and investors. With WebSockets, stock prices and market data can be streamed instantly to connected clients, enabling them to make informed decisions without delays. This provides a competitive advantage in fast-paced financial markets.

Pros & cons of WebSockets

9 Pros of WebSockets

  • Efficient and Low Latency: WebSockets provide a persistent connection between the client and the server, allowing real-time communication with low latency. This eliminates the need for frequent HTTP requests and reduces network overhead.
  • Bi-Directional Communication: Unlike traditional HTTP requests, WebSockets enable full-duplex communication, allowing data to be sent and received simultaneously. This makes it ideal for applications that require real-time updates, such as chat applications or collaborative tools.
  • Event-Driven Architecture: WebSockets follow an event-driven architecture, where the server can push data to the client whenever new information is available. This eliminates the need for the client to continuously poll the server for updates.
  • Scalability: WebSockets are designed to handle a large number of concurrent connections, making them highly scalable. This makes it suitable for applications that require real-time updates to a large number of clients simultaneously.
  • Wide Browser Support: WebSockets are supported by modern web browsers, including Chrome, Firefox, Safari, and Edge. This allows developers to build real-time applications that work across different platforms without compatibility issues.
  • Secure Communication: WebSockets can be implemented over secure connections (wss://), providing encryption for data transmission. This ensures that sensitive information remains secure during real-time communication.
  • Reduced Server Load: With WebSockets, the server can efficiently push updates to clients, reducing the load on the server compared to traditional polling techniques.
  • Easy Integration: WebSockets can be easily integrated with existing web technologies, such as JavaScript frameworks and backend server technologies. This makes it convenient for developers to incorporate real-time communication into their applications.
  • Real-Time Analytics: WebSockets allow for real-time data streaming, enabling applications to perform real-time analytics and make data-driven decisions instantly.

9 Cons of WebSockets

  • Lack of Support in Older Browsers: WebSockets are not supported in older versions of Internet Explorer (IE) and some other outdated browsers. This can limit the reach of real-time applications to a subset of users.
  • Complexity: Implementing WebSockets requires more complex server-side infrastructure compared to traditional HTTP-based communication. This may increase development time and complexity for certain applications.
  • Connection State Management: WebSockets maintain a persistent connection, and managing the connection state can be challenging. Developers need to handle scenarios such as connection drops, timeouts, and reconnection strategies.
  • Incompatible Proxy Servers: Some proxy servers and firewalls may not be compatible with WebSockets, leading to connection issues. This can pose challenges in certain network environments.
  • Increased Bandwidth Usage: The persistent connection of WebSockets can lead to increased bandwidth usage compared to traditional HTTP requests. Applications should be optimized to minimize unnecessary data transfers.
  • Server Resource Consumption: WebSockets require server resources to maintain persistent connections. Handling a large number of concurrent connections can put a strain on server resources.
  • Security Considerations: While WebSockets can be implemented securely, developers need to be cautious about potential security vulnerabilities, such as cross-site scripting (XSS) attacks or malicious data injection.
  • Limited Message Size: WebSockets have a maximum message size limit, which varies depending on the browser and server implementation. This can restrict the size of data that can be transmitted in a single WebSocket message.
  • Complexity for Load Balancing: Load balancing WebSocket connections across multiple servers can be more complex compared to traditional HTTP-based load balancing.

TOP 10 WebSockets Related Technologies

  • JavaScript

    JavaScript is the most popular language for WebSocket software development. It is supported by all major browsers and has a large community of developers. With its event-driven and asynchronous nature, JavaScript is well-suited for real-time applications.

  • WebSocket API

    The WebSocket API is a fundamental technology for WebSocket software development. It provides a JavaScript interface for creating WebSocket connections, sending and receiving messages, and handling events. The WebSocket API is widely supported by modern browsers.

  • Node.js

    Node.js is a popular runtime environment for server-side JavaScript applications. It offers a non-blocking I/O model, which makes it well-suited for handling WebSocket connections and real-time communication. Many WebSocket frameworks and libraries are available for Node.js.

  • Socket.IO

    Socket.IO is a popular WebSocket library for JavaScript that provides real-time, bidirectional communication between the server and the client. It offers features like automatic reconnection, multiplexing, and room-based communication. Socket.IO is widely used in web applications.

  • SignalR

    SignalR is a real-time communication library for ASP.NET applications. It supports WebSocket as well as other fallback transports like Server-Sent Events and Long Polling. SignalR simplifies WebSocket programming in the ASP.NET ecosystem.

  • Spring WebSocket

    Spring WebSocket is a WebSocket module provided by the Spring Framework for Java-based web applications. It integrates seamlessly with other Spring modules and offers features like message handling, security, and scalability. Spring WebSocket is widely used in enterprise applications.

  • Go

    Go is a programming language known for its simplicity, performance, and concurrency. It has built-in support for WebSocket and provides a straightforward API for handling WebSocket connections. Go is well-suited for building high-performance WebSocket applications.

Soft skills of a WebSockets Developer

Soft skills are essential for a WebSockets Developer to effectively communicate and collaborate with team members, clients, and stakeholders. These skills complement technical expertise and contribute to the overall success of a project. Here are the soft skills required at different levels of experience for a WebSockets Developer:


  • Problem-Solving: Ability to analyze and solve complex problems related to WebSockets implementation.
  • Communication: Clear and concise communication to effectively convey ideas and requirements.
  • Adaptability: Willingness to learn and adapt to new technologies and frameworks.
  • Teamwork: Collaboration with team members to achieve common goals and deliver high-quality results.
  • Time Management: Efficiently managing time and meeting deadlines for assigned tasks.


  • Leadership: Taking initiative and guiding junior developers in WebSockets development.
  • Mentoring: Sharing knowledge and providing guidance to junior developers to enhance their skills.
  • Critical Thinking: Evaluating different approaches and making informed decisions based on project requirements.
  • Client Management: Building and maintaining positive relationships with clients, understanding their needs, and providing effective solutions.
  • Collaboration: Working closely with cross-functional teams to ensure seamless integration of WebSockets functionality.
  • Conflict Resolution: Resolving conflicts and addressing challenges that may arise during the development process.
  • Quality Assurance: Conducting thorough testing to ensure high-quality and bug-free WebSockets implementation.


  • Project Management: Planning, organizing, and overseeing WebSockets development projects from start to finish.
  • Strategic Thinking: Identifying opportunities for improvement and implementing strategies to enhance WebSockets functionality.
  • Client Consultation: Providing expert advice and recommendations to clients regarding WebSockets implementation.
  • Decision-Making: Making informed decisions based on technical expertise and project requirements.
  • Team Leadership: Leading and motivating a team of developers to achieve project goals and deliver exceptional results.
  • Effective Communication: Communicating complex technical concepts to non-technical stakeholders.
  • Innovation: Staying updated with the latest trends and technologies in WebSockets development and bringing innovative ideas to the table.
  • Continuous Learning: Continuously acquiring new skills and knowledge to stay at the forefront of WebSockets development.

Expert/Team Lead

  • Strategic Planning: Developing long-term strategies and roadmaps for WebSockets development.
  • Resource Management: Allocating resources efficiently and optimizing the team’s productivity.
  • Technical Leadership: Providing technical guidance and mentorship to the entire development team.
  • Risk Management: Identifying potential risks and implementing preventive measures to mitigate them.
  • Business Acumen: Understanding the business implications of WebSockets development and aligning it with organizational goals.
  • Project Estimation: Accurately estimating the time and effort required for WebSockets development projects.
  • Client Relationship Management: Building and maintaining strong relationships with clients and ensuring their satisfaction.
  • Continuous Improvement: Driving innovation and continuous improvement in WebSockets development processes and practices.
  • Strategic Partnerships: Identifying and establishing partnerships with relevant technology providers and industry leaders.
  • Technical Expertise: Demonstrating deep knowledge and expertise in WebSockets development and related technologies.
  • Team Management: Managing and developing a high-performing development team for successful project execution.

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 in the development of software applications, debugging and troubleshooting code, learning and applying coding best practices, collaborating with the team on projects, participating in code reviews$50,000 – $70,000
Middle2-5 yearsDeveloping and maintaining software applications, writing clean and efficient code, participating in the design and architecture of software systems, collaborating with cross-functional teams, mentoring junior developers, conducting code reviews$70,000 – $90,000
Senior5-10 yearsLeading the development of complex software applications, designing and implementing scalable solutions, providing technical guidance and mentorship to the team, conducting code refactoring and optimization, collaborating with stakeholders, leading project planning and execution$90,000 – $120,000
Expert/Team Lead10+ yearsLeading and managing a team of developers, setting technical direction and strategy, overseeing the entire software development lifecycle, coordinating with other teams and departments, driving innovation and continuous improvement, acting as a subject matter expert, resolving technical challenges$120,000 – $150,000+

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