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Node.js (often referred to as NodeJS or just Node) is a JavaScript runtime built on Chrome's V8 JavaScript engine. It allows developers to run JavaScript on the server side while creating server-side applications with JavaScript.
It is an open-source, cross-platform runtime environment widely used to create scalable network applications.
Ryan Dahl wrote Node.js in 2009 in C++, and the initial release supported only Linux and Mac OS X. Its development and maintenance were led by Dahl and later sponsored by Joyent.
Primarily, developers use Node.js on the back end, but it is also popular as a full-stack and front-end solution. Developers use Node.js for the following purposes:
- Building web servers and APIs: Node.js is well-suited for building lightweight, high-performance web servers and APIs. Its non-blocking I/O model makes it well-suited for handling many concurrent connections.
- Real-time web applications: Developers use Node.js to build real-time web applications that require low latency and fast data transfer, such as chat applications and online games.
- Command-line tools: To build command-line tools and utilities. Its package manager (NPM) makes it easy to find and use thousands of existing packages.
- Building and automating build processes: Developers use Node.js as a build tool to automate tasks like minifying code and running tests.
- Microservices: Node.js is increasingly being adopted for building microservices, small, independent services that can be developed, deployed, and scaled independently.
Node.js is a trendy option even for many well-known tech firms. Big brands like Microsoft, Netflix, Uber, PayPal, NASA, eBay, Amazon Web Services, and others use Node.js to power their businesses.
If you are hiring a Node.js developer, look for a few essential factors in your future developers regarding their knowledge and skills.
Essential skills the future nodejs developer needs to have should be proficiency in JavaScript/TypeScript (including basic functional programming concepts such as higher-order function etc., dependency injection, MVC, and design patterns), basic knowledge of standard development tools – Git, ESLint, Prettier, practical understanding of SQL, essential experience in Docker and Docker Compose and experience and expertise in Node.js.
Depending on the complexity of your project, you can hire:
- An Entry-level/Junior Nodejs Developer (0-2 years of experience): Someone who might be relatively new to Node but has at least basic knowledge and understanding about Node and its frameworks. They may need guidance and support to complete tasks and projects, but their skills should improve with time. They may not be able to complete many tasks independently but should be able to work as part of a larger project.
- An Intermediate Nodejs Developer (2-5 years of experience): Developer with a solid understanding of the language and ecosystem. They have experience building and maintaining scalable, production-grade applications and may have experience leading small development teams. They should be able to complete most tasks with minimal guidance.
- A Senior Nodejs Developer (5+ years of experience): An expert in the language and ecosystem. They have extensive experience building and maintaining scalable, production-grade applications and have experience leading large development teams. They also have experience with other technologies and platforms. For example, when looking to hire senior nodejs developers they typically have full stack node experience using either the MERN or MEAN stack.
A human resources (HR) manager or senior team lead will use the hiring process for a Node.js developer to assess the candidate's skills and accurately predict if the candidate will be a good fit for the company. The hiring process should include the following steps:
- Resume and cover letter review: A cover letter and resume review will identify candidates who meet the qualifications and experience requirements for the position.
- Reference and background check: Before continuing to the next stage, the hiring team will typically conduct reference and background checks on the candidates who meet the requirements.
- Interview: Candidates who pass the resume review will be contacted for an in-person or video interview. This interview will typically include questions about the candidate's experience and qualifications and their understanding of the Node.js platform and related technologies.
- Technical assessment: Candidates who pass the interview will complete a technical evaluation, including a coding challenge or a take-home project. This assessment will help the hiring team evaluate the candidate's technical abilities with nodejs and problem-solving skills.
- On-site or remote interview: Candidates who pass the technical assessment will be invited for an on-site or remote interview. This interview will typically include a mix of technical and behavioral questions and may also have a pair-programming session.
- Job offer: The last step in the hiring process is sending a job offer to the candidate who is the best fit for the company.
The specific steps in the hiring process may vary depending on the company and the role, but the goal should be to assess the candidate's technical skills, experience with Node.js, and fit for the position and the team.
We look forward to hiring a new colleague who wants to help us achieve ambitious goals! At [COMPANY], you are not an employee; you are the [COMPANY].
We value creativity, persistence, and innovation, passionately believing that it is through teamwork that we can all reach greater heights. We are looking for a new member to join us.
If you are a Node.js developer and want to shape the world's future, we are open to receiving your resume.
Responsibilities:
- Developing the latest backend features using JavaScript/TypeScript, Node.js, and Nest.js
- Suggest improvements and present them to the client and the team
- Optimizing components for maximum performance across a vast array of web-capable devices and browsers
- Follow industry and tech standards
- Suggest improvements and present them to the client and the team
- Write effective APIs
- Troubleshoot, debug and upgrade the codebase
Education & Experience:
- Bachelor's degree in Computer Science/related field or relevant experience equivalent
- Excellent verbal and written English skills
- High proficiency & experience with Node.js
- Experience with HTML, CSS, and JS
- Front-end and back-end development experience
When seeking to hire a Node.js developer, here are a few good questions to ask in a technical interview:
Question 1: What is an error-first callback in Node.js?
An error-first callback is a callback function. It is used to pass errors and data. It follows a specific convention of taking an error object as the first argument, providing information about an asynchronous operation's outcome. If there is no error, the error object will be null.
Question 2: Explain what buffers are in Node.js and what they are used for.
Buffers in Node.js are a way of handling binary data in JavaScript. A buffer is a temporary memory mainly used by the stream to hold onto some data until it is consumed.
They are similar to arrays of integers but correspond to a raw memory allocation outside the JavaScript heap.
Buffers are used to represent a fixed-size chunk of memory allocated outside of the V8 JavaScript engine. It is like an array of integers representing a byte of data, and they can't be resized.
Buffers also support legacy encodings like ASCII, UTF-8, and others.
Question 3: Provide an example of utilizing async-await in Node.js.
An example of using async-await pattern:
Question 4: Explain how the workflow looks in Node.js.
The clients send requests to the webserver to interact with the web application. These requests can be non-blocking or blocking and used for querying, deleting, or updating the data. Node.js receives the incoming requests and adds them to the Event Queue.
After that, the requests are passed through the Event Loop. It checks if the requests are simple enough not to require external resources. The event loop then processes the simple requests (non-blocking operations), such as I/O Polling, and returns the responses to the corresponding clients.
A thread from the Thread Pool is assigned to a single complex request. This thread is responsible for completing a particular blocking request by accessing external resources, such as computation, database, file system, etc. Once the task is completed, the response is sent to the Event Loop, that sends that response back to the client.
This approach allows Node.js applications to handle many concurrent connections and perform multiple I/O operations simultaneously, making it suitable for high-performance, high-concurrency scenarios, such as real-time web apps and APIs, chat applications, and online games.
Question 5: What is "Callback hell", and what are the ways to avoid it?
"Callback hell" refers to heavily nested callbacks that have become unwieldy or unreadable. Modularization, premises, and generators can fix the callback hell. Modularization breaks callbacks into independent functions; however, a better solution presents itself as premises in some situations.
With generators, there is no problem, but with more straightforward examples like these, it would be overkill to use them.
An example of heavily nested code is below:
An example of fixed code:
The best way to evaluate whether a developer is a great match is by working with them. That's why we make it as easy as possible to get started. If a developer isn't working out within the first two weeks of your engagement, we'll work with you to find a better match and won't bill you for the original developer. It's a no-risk way for you to get the help you need even faster.
Developers in the Torc community set their own rates. The three primary factors that determine the cost of a Remix developer are:
- Experience - Everyone would prefer a senior developer but, let's be honest, 10+ years of experience isn't always required. If you consider the work the developer will be doing and the amount of support within your existing team they'll have access to, you might be better served with one or two junior Remix developers over one senior developer.
- Skill mix - Marketplaces operate under normal supply and demand dynamics. Developer rates often increase with more niche, complex, or in-demand skill requirements.
- Geography - While remote work has flattened the geographic pay disparity to some degree, where your developer lives does factor into their cost. In 2022, the median rate for Torc developers in Latin America was 29% lower than developers in the U.S., Canada, and Western Europe, while the median rates in Eastern Europe and Asia/Oceania were 24% and 40% lower, respectively.
Torc simplifies the hiring process for you and for developers, and it all starts with letting us know what you're looking for. If you're a new Torc customer, schedule a meeting with our sales team to discuss your needs and get the paperwork squared away. If you're an exiting customer, you can create a new job opportunity directly in the Torc platform.
Once the job is finalized, our AI matching algorithm and team of technical talent specialists will get to work identifying great candidates from the Torc community. You can review their profiles and assessments, interview shortlisted candidates, and hire the perfect developer - all in under a week.
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