Hire The Top 1% Freelance Node Developers

Flexiple is a network of top Node developers, engineers, and architects with hourly rates ranging from $30 to $100. Join 100+ teams who have hired Node developers from Flexiple for a few weeks to a few years!

Flexiple spent good amount of time understanding our requirements, resulting in accurate recommendations and quick ramp up by quality developers.

Narayan Vyas, Senior PM (YC S12)

Overall Flexiple brought in high-level of transparency with quick turnarounds in the hiring process at a significantly lower cost than any alternate options.

Esther Hersh, Co-founder ('17 NYU Grad)

Flexiple has been instrumental in helping us grow at a fast pace. Their vetting process for engineers is top notch and they connected us with quality talent quickly.

Tanu V, Founder (#1 Salesforce Leads App)

Work With Flexiple's Expert Node Developers!

Be a short-term or a long-term project, don't compromise on the quality of talent you work with. Flexiple handpicks only the Top 1% through a 6-stage screening process.
  • Tri Nguyen, freelance nodejs developer
    Tri Nguyen
    Python React Node

    Tri is a Full Stack Developer, who specializes in developing web applications for data analytics. His top skills include NodeJs, ReactJS, Python, AWS, Kubernetes ... and he started his career as an intern at Google while picking up Django. He has worked in many product-based companies and has built a knack for developing complex and interactive applications. He then started freelancing as a developer on technologies including NodeJS, Python, etc. from 2018 and is excelling in working on challenging projects including ETL/ ML projects. Read more

    Previously at Pecan Analytics

    Hire Tri
  • Tri Nguyen, freelance nodejs developer
    Surbhi Airan
    React Node Angular

    Surbhi has 4+ years of experience in software development and has worked as a Full Stack developer with experience in building apps across NodeJS, ReactJS, ... and AngularJS. She has been working on remote contracts for the past couple of years as a freelance NodeJS developer and possess good communications skills (verbal and written) and is very responsive. Read more

    Previously at DXC Tech

    Hire Surbhi
  • Rex Varghese, freelance nodejs developer
    Rex Varghese
    PHP Android Node

    Rex, an experienced software consultant, has a demonstrated history of working in the computer software industry. With 15+ years of experience, Rex, also a freelance ... NodeJS developer, has a diverse portfolio which includes projects in various companies as well as independent projects. Rex is well versed with Backend Design and Development, Database Design and Programming, API Design and Development, Mobile Application Development, PHP MVC Framework and Javascript Cloud Server Management among others. Read more

    Previously at DQS NXT

    Hire Rex
  • Eric Grosse, freelance nodejs developer
    Eric Grosse
    React Node Vue

    Eric, a freelance NodeJS developer has a prolific record of building multiple large-scale web applications. Having been freelancing for the past 4 years, he has ... worked for various startups in roles that range from Junior to Lead Developer. He is also an accomplished blogger with several published tech articles under his belt. Read more

    Previously at Navori Labs

    Hire Eric
  • Komal Ahluwalia, freelance nodejs developer
    Komal Ahluwalia
    Java Node React

    Komal is a software engineer with 5+ years of experience in developing scalable and concurrent business applications. Further, being exposed to the agile methodology ... gives her the ability to adapt to new technologies, learn, master and coach. She has also gained experience as a freelance developer and has worked on NodeJS, ReactJS, AngularJS and Java. Read more

    Previously at Thoughtworks

    Hire Komal
  • Bala Narayanan, freelance nodejs developer
    Bala Narayanan
    PHP Node

    A seasoned and versatile professional with over 10+ years of experience in the software industry, Bala has an entrepreneurial mindset with meticulous attention ... to detail and the ability to decouple and re-engineer existing applications. He is an avid programmer with a flair for technical management and aptitude to learn new technologies. Also, over more than 6+ years, Bala has worked as a freelance developer on NodeJS, Angular, AWS and PHP, etc. Read more

    Previously at Infosys

    Hire Bala
  • Ravish Arya, freelance nodejs developer
    Ravish Arya
    Angular Node React

    Ravish is a polyglot developer with 15+ years of experience. Over his career, he has worked on modern software development technologies such as JavaScript (NodeJS, ... ReactJS, React Native) building complex applications for the likes of IBM and Amazon. Since June '19, he has been enjoying the freedom that goes along with being a freelance NodeJS developer and enjoys teaching coding in his free time. Read more

    Previously at Mobiquity

    Hire Ravish
  • Vitaly Senko, freelance nodejs developer
    Vitaly Senko
    Node React Vue

    Vitaly, a freelance Node JS developer, has around 6+ years of experience in software development. He started his career as a .NET developer and now has grown up to ... become a NodeJS expert. Vitaly has worked in service companies, product companies and also in startups making him suitable for any kind of environment. Other than NodeJS and .NET, his skills include ReactJS, VueJS, ExpressJS and MongoDB. Read more

    Previously at Mercer

    Hire Vitaly

Flexiple Helps You Hire Quality Developers, Handpicked for You

  • Work only with the best

    Our developers are selected through a 6-stage screening process. As a result, our developers have an average of 5-years industry experience and are ready to immediately contribute on projects.
  • Work with Role-specific Developers

    Save time and energy lost in manually sifting through profiles. Our solutions expert along with our Director of Technology will handpick developers who are a perfect match for your requirement.
  • Work Risk-free & Start within 2 Days

    With immense confidence in the quality of our developers and the accuracy of our recommendations, we are happy to offer you a 1-week trial where you pay only if you are satisfied.

Find the perfect developer for your team at the right price

  • Individual Contributor

    $
    /year
    $30-50
    /hour
    • 1-3 years of experience
    • Mostly worked on a single stack
    • Top Individual Contributor
  • Multi-faceted Contributor

    $
    /year
    $50-80
    /hour
    • 3-7 years of experience
    • Expertise in multiple stacks
    • Worked on niche skills
    • Mentors Junior Developers
  • Leader & Diverse Contributor

    $
    /year
    $80+
    /hour
    • 7-10+ years of experience
    • Works across tech stacks
    • Multiple niche skills
    • Led multiple teams in the past

How We Select the Top 1%

45.4%pass rate

Depth in past work

Flexiple Developers are reviewed on their experience and complexity of products built. Those who display depth and have worked on end-to-end projects are given an introductory call.

14.6%pass rate

Good communication and motivation

Over a call, the developer’s ability to communicate in an articulate manner is tested. A deeper understanding of the candidate’s technical experience and also motivation to freelance is achieved.

3.1%pass rate

Strong technical abilities

Over one or more F2F interviews, the developer’s involvement and performance in building complex software products are assessed. This sets the platform to delve deeper into technology-specific discussions.

1.5%pass rate

Keen problem solving and coding

Developers' mental agility and problem-solving abilities are tested through a coding test involving algorithmic as well as skill-specific problems. A mixture of live evaluation and timed coding tests is used.

1.2%pass rate

Splendid reviews in background check

The live experience of working with developers is verified by reaching out to past clients and/or employers. Inputs on various qualitative factors such as reliability, punctuality, communication and responsiveness are received.

1%pass rate

Consistent exemplary performance

Performance during each engagement is continually assessed. Our developers are expected to maintain Flexiple standards across all engagements with our customers.

Hire Freelance Node Developers within 48 Hours!

Our simple process gets you working with the right freelancer quickly and seamlessly

Don't Just Take Our Word For It!

(Y-Combinator S12 and Andreessen Horowitz-backed Company)

Quality product launched on schedule by a team of 8 engineers

"Flexiple helped us hire quality developers across technologies - Node, Rails, PHP, Python. They spent a good amount of time understanding our requirements, resulting in accurate recommendations and quick ramp up by developers. We also found them to be much more affordable than other alternatives for the same level of quality."

Narayan Vyas,

Senior Product manager, Plivo Inc

(Incubated at the European Space Agency)

Helped set up and scale tech team on demand

"Flexiple has exceeded our expectations with their focus on customer satisfaction! The freelancers are brilliant at what they do and have made an immense impact. Highly recommended :)"

Henning Grimm,

Founder, Aquaplot

(Acquired by Unicorn, Hike Messenger)

Saved 30% costs with 2 software products delivered

“Overall Flexiple brought in high-level of transparency with extremely quick turnarounds in the hiring process at a significantly lower cost than any alternate options we had considered.”

Kislay Shashwat,

VP Finance, CREO

('17 NYU Graduates)

Found a perfect new member for its globally distributed team

"Working with Flexiple has provided us with partners who are providing us with the required technical support for our growth and success!"

Esther Hersh,

Co-founder, Peblio Inc

(Y-Combinator S18)

Hired the first remote engineer to work directly with the CTO

"It has been great working with Flexiple for hiring highly talented and hardworking folks on contract. We were looking for a suitable developer on the back-end and we got to know Ankur through Flexiple. We are very happy with the commitment and skills he brings to the job and we will be working with Flexiple going forward as well after this positive experience. I recommend them highly for any freelancing talent you are looking to hire!"

Neil Shah,

Chief of Staff, Prodigal Tech

(#1 Lead Routing App for Salesforce)

Helped scale the product with a team of engineers

"Flexiple has been instrumental in helping us grow at a fast pace. Their vetting process for engineers is top notch and they were able to connect us with quality talent quickly. The team put great emphasis in understanding our requirements and getting to know us which ensured that we were matched with folks who were a great fit not only technically but also culturally."

Tanu V,

Founder, Power Router

(Acquired by Reliance for $100 million)

Delivered 2 high quality products forming a long partnership

"The engagement with Flexiple and their community members has helped us get work done in a timely manner and helped us go above and beyond."

Swapan R,

Co-founder, Haptik

(Acquired by PayU for $70 million)

Built their first remote tech team of a frontend and backend engineer

"Highly responsive team with prompt support and willingness to go the extra mile. Powered by technically brilliant personnel on board, we have happy results – all this at an affordable price!"

Sajith N,

Product Manager, Wibmo Inc
  • How to Hire a Great Freelance NodeJS Developer?


    NodeJS is a server-side platform built on Google Chrome's JavaScript Engine (V8 Engine) written by Ryan Dahl in 2009, about thirteen years after the introduction of the first server-side JavaScript environment. According to SimilarTech, there are about 165 thousand websites build using NodeJS, with the United States having the highest share.

    If you’re looking to hire a freelance NodeJS developer, this guide is going to help you find the perfect fit. We’ve included everything you need to know about hiring a freelance NodeJS developer.

    Before diving into the fundamentals of hiring a freelance NodeJS developer, let's delve into some interesting facts about the history of NodeJS.

    We have broken the sections into the following parts:
    1. Let's introduce NodeJS to you.
    2. Why is NodeJS widespread?
    3. Writing the Job Description
    4. Interview Questions for hiring a NodeJS developer
    - Basic Questions
    - Advanced Questions
    - Data Structures/Algo Questions


    1. Let's introduce NodeJS to you

    • Origin story: With the emergence of JavaScript and PHP, developers began to push their limits with web apps, but the browsers back then couldn’t keep up. So, Google launched Chrome. The team chose to build the actual JavaScript interpreter as a stand-alone project and called it JavaScript engine “V8”. V8 was amazingly fast, which gave Ryan Dahl the brilliant idea of using V8 on the server-side to execute JavaScript on the server, which let to NodeJS.

    • Widely popular: The United States has the most number of websites developed using NodeJS (37K+), followed by Russia(11K+) and China(10K+).

    • Used by top companies: Top companies like Netflix, LinkedIn, Wallmart, Trello, Uber, Medium, eBay, etc. use NodeJS.

    • Other trivia: The initial release of NodeJS only supported Linux and Mac OS X.

    • 2. Why is NodeJS widespread?

      • Performance and Scalability: Node being built on V8 operates on a single thread, making use of the event loop and callbacks for I/O operations, thus handling hundreds of thousands or even a million concurrent connections.
      • NPM(Node Package Manager): Gives developers multiple tools and modules to use, thus further boosting their productivity.

      3. Writing the Job Description

      Below are some key points that we at Flexiple have learned through trial and error - a process of filtering through over 15,000 developers.

      • Years of software development experience: Be specific about the technology you’re looking for and the number of years of experience needed. A proxy to years of experience can be the number of production-level apps worked on.

      • Type of products built in the past: You can filter out applications based on the candidate’s past work if you want someone who has a fair idea about how things work in a product like yours.

      • Exposure to specific industries:  Developers who have built products in certain industries will already know key aspects of laying the foundation for a great product and will be able to predict possible problems.

      • Experience working remotely: Hiring someone who has worked remotely in the past is an added benefit as they have front-hand experience of everything right from how the contracts work to communication and from timelines to deliverables.

      • Strong communication: An essential thing to look at when hiring a freelancer is excellent communication skills. Since all the interaction happens online, a freelancer needs to be able to seek to understand and be direct in their language.

      • 4. Interview Questions for hiring a NodeJS developer

        Now that you have made a quality JD, it can still be tricky to evaluate the skills of your applicants. To help you with that, we have created a pool of questions that a good NodeJS developer should be comfortable with.
        It is important to note that the ability to answer these questions doesn't imply that you have a top quality candidate. But it definitely is a big step in that direction.

        To help you navigate through these questions, we’ve categorized the interview questions in 3 parts:

        A. Basic concepts: Includes all basic concepts used across languages but we've focused on their significance in Node. This will give you an understanding of how strong their programming foundation is.

        B. Advanced concepts: Includes all concepts that someone with higher expertise should know.

        C. DS/Algorithm questions: To test the logical capability of the candidate.


        A. Basic concepts


  • How is Node.js asynchronous when javascript is single-threaded ?

    We first need to understand that Node.js is just a Javascript runtime built on Chrome’s V8 engine. The V8 engine was originally made by Google for Google. It was written in C++ to compile Javascript functions to machine code. It is highly efficient and optimised and is also used in Google Chrome for the same purpose.

    Javascript is a single threaded language. This means that it has one call stack and one memory heap. Due to this it has to execute code sequentially. But as we know, the devils of synchronous programming can often decrease the efficiency of code. This is primarily due to blocking code which takes a long time to execute, such as I/O operations.

    Request Handling in Browsers

    To combat this problem, we have the different browser engines such as Chrome’s V8 engine, Firefox’s Spidermonkey, etc.. Tasks which take a long time are handled by Web API of these engines, which handle them in the background and allow synchronous execution of the rest of the code. When the background task in the Web API is done, a callback is pushed to the call stack.

    Multi-threaded Request-Response Architecture

    In other popular web application technologies such as JSP, Spring, ASP.NET, the language spawns a thread for each request and the thread executes the request and sends back a response. This is known as Multi-threaded Request-Response architecture.

    Single-threaded Event Loop Architecture

    Node.js on the other hand follows a path similar to Javascript. Node.js follows Single-threaded Event Loop architecture. It is built upon Javascript’s event based model with its callback mechanism.

    The Node.js web server internally maintains a thread pool to handle client requests, but these are not meant to be handled and used by the developer directly. The number of threads in the thread pool depends on the number of cores the CPU has. When the web server receives the requests, they are added to a queue known as ‘Event Queue’.

    ‘Event Loop’ is yet another internal component which is central to this architecture of Node.js. Event Loop uses a single thread only. It runs indefinitely and checks the Event Queue for requests. If the request does not require any blocking I/O operation like handling file system, database, then the single thread directly executes them. But if there is any such operation then a thread is picked up from the thread pool, assigned to the request, and when it finishes puts a callback in the Event Loop.

    Therefore, Node.js runs on a single thread, similar to Javascript, but it maintains a thread pool from which it spawns threads to run asynchronous functions in the background.


    B. Advanced concepts

  • As Node.js is asynchronous how do you manage when you need to make sequential requests, that is one request that depends on the previous one?

    Synchronous programming means sequential execution of code. That is, the next block of code executes only after the first block of code.

    Example:

    console.log(1)
    console.log(2)
    console.log(3)
    

    Output:

    1
    2
    3
    
    As you can see each console.log() executes one after another.

    Asynchronous programming means the code doesn’t run in the sequence that it is written in. In this, the code executor doesn’t wait for the task to finish before proceeding to the next task. Hence, synchronous functions are often called “blocking” as they block further code execution and asynchronous functions are called “non-blocking”.

    Example:

    console.log(1)
    setTimeout(() => console.log(2), 0)
    console.log(3)
    


    Output:

    1
    3
    2
    


    According to sequence, the 2nd console.log() should have fired before the 3rd one, but as setTimeout is an async (asynchronous) function it allowed the code to move on and the 3rd line was executed before the 2nd one.

    Now, some logic needs to be executed sequentially. For example, fetching records from a database, then editing it and finally updating the record in the database. This cannot be executed in an async manner because the order is important for this. Therefore, an async function uses callbacks, promises, or async-await to be able to sequentially work with such code.

    Callbacks were quite popular in the past, but also became infamous for ugly looking nesting called “callback hell” which made it difficult to maintain. So promises have become more popular. They function similar to callback - you attach a “.then()” at the end of the function and follow up with a catch block at the end which handles the errors.

    Example: - if fun() is our main function inside which promise() is an async function which is being called then it would look something like this:

    fun = () => {
    	promise().then(() => {
    		console.log("executed code")
    		// sequential execution occurring after the promise function is executed
    	}).catch((e) => {
    		console.log(e)
    	})
    }
    


    If the promise function returns something then it would look like this:

    fun = () => {
    	promise().then((data) => {
    		console.log(data)
    		// sequential execution occurring after the promise function is executed
    		// and data is what it returns
    	}).catch((e) => {
    		console.log(e)
    	})
    }
    


    But the ugliness of callback hell nesting is avoided by doing promise chaining:

    fun = () => {
    	promise().then(() => {
    		return "first promise"
    	}).then(() => {
    		return "second promise" 
    	}).then(() => {
    		return "third promise"
    	}).catch((e) => {
    		console.log(e)
    	})
    }
    


    Here each block of code is executed after the previous block of code. Async Await is a more refined form of promises. It is even referred to as syntactic sugar as the code looks much better after it:

    fun = async () => {
    	const var1 = await promise()
    	const var2 = await promise()
    	const var3 = await promise()
    } 
    


    Async is a keyword which needs to be defined so that await can be used inside the scope of the function. Await causes the next lines of code to wait for the response from that function. This allows the code to look much better and we can actively decide whether we want the function to run asynchronously or synchronously.
  • What is a load balancer and how will you set it up?

    First let us discuss why load balancers are required. As the traffic increases on a server, the server experiences a slow down. To prevent this slow down, the server needs to be scaled up. Scaling of server can be achieved in two ways:
    1. Vertical Scaling
    2. Horizontal Scaling
    Vertical scaling refers to upgrading the resources of a particular server by increasing storage, increasing RAM, upgrading CPU. This gives the server more cores, faster execution speed, faster access time to storage and more storage. This was largely the traditional way of increasing performance of a server.

    Horizontal scaling refers to using multiple servers to increase the performance of the back end infrastructure. So, instead of boosting resources of one server, multiple servers are used together. This has been found to be cheaper than vertical scaling and therefore practiced on a large scale. A load balancer is, thus, required in case of horizontal scaling.

    In software development, load balancing refers to the process of distributing a set of tasks over a set of resources, with the aim of making their overall processing more efficient. Coming to backend development, load balancing refers to efficiently distributing incoming network traffic across a group of backend servers. Such a group of servers is called a server farm or server pool.

    Along with distributing traffic load balancers also help in preventing a server from becoming a single point of failure. In a large scale architecture load balancers can be placed at 3 levels:
    • between client and web server
    • between web server and internal platform layer (like cache server or application server)
    • between internal platform layer and database
    But we are primarily going to focus on the first one.

    Working

    One server is taken primarily for load balancing. The requests first hit this server and then based on the load balancing algorithm the request is routed to one of the several back end servers, which carry out the request.

    A load balancer considers two factors before forwarding a request:
    • An algorithm that helps in choosing from the healthy servers
    • If the server chosen is responding appropriately

    The different algorithms used by a load balancer are:
    1. Least Connection Method: Direct traffic to the server with fewest active connections
    2. Least Response Time Method: Direct traffic to the server with fewest active connections and least response time
    3. Least Bandwidth Method: Direct traffic to the server serving the least amount of traffic (measured in Mbps)
    4. Round Robin Method: Directs requests to servers in a cyclic manner
    5. Weighted Round Robin Method: Different servers are weighed according to their resources, accordingly the one with more weights is given more priority.
    6. IP Hash: A hash is calculated of the IP address of the client. The server to forward the request to is chosen based on the hash value. 

    NGINX

    A popular software used for load balancing is NGINX. It is an open source software for web serving, reverse proxying, caching, load balancing, media streaming, and more. It started out as a web server designed for maximum performance and stability. In addition to its HTTP server capabilities, NGINX can also function as a proxy server for email (IMAP, POP3, and SMTP) and a reverse proxy & load balancer for HTTP, TCP, and UDP servers.

    It is quite simple to use NGINX as a load balancer. Install NGINX in the server chosen to be as the load balancer.

    upstream app_servers {     
        server backend1.example.com; 
        server backend2.example.com; 
        server backend3.example.com; 
    }
    


    server {
            listen       80;
            server_name  localhost;
    
    location / {
       proxy_set_header X-Real-IP $remote_addr;
       proxy_set_header Host      $http_host;
       proxy_pass       http://app_servers;
    }
    }
    


    The upstream app_server block holds the servers to redirect requests to. Inside the location block, we are setting app_server as the target block. The server_name identifies which domain the load balancer will show.
  • Give a detailed overview of any one authentication strategy?

    Web apps need to be authenticated to ensure that only the required people get access to the required data. Without strong authentication, you can suffer problems ranging from unauthorized login to complete leak of the database.

    Authentication strategies are methods for user authentication and management. There are multiple ways to achieve this. With a constantly shifting landscape, it is difficult to zero in on one strategy as the best. Yet, it is a necessary element of almost all real world Node.js projects.

      The authentication strategies in Node.js can broadly be classified into 3 types:
    • Middleware Modules (like Passport.js)
    • User Management as a Service
    • Custom Database and Authentication

    Middleware Modules

    These are npm packages such as Passport.js, Everyauth and Permit. These are packages that work on top of Node.js frameworks such as Express.js, Koa.js, Hapify.js. They utilise the ‘connect’ middleware conventions. This means that while using the aforementioned frameworks, you can just plug in the modules and use their functionality.

    These mainly deal with session management, and also provide single sign on features. But their functionality is largely limited to this. They do not provide other features like account verification and password reset, which are left to the developer to develop.

    Passport.js is by far the most popular amongst these packages. It is an authentication middleware designed primarily to authenticate requests and to safeguard endpoints/routes from unknown users. It can be implemented within an Express-based Node.js web application.

    Today, there are multiple ways of providing authentication: like a simple sign up/login or single-sign-on using an OAuth provider such as Facebook or Github, etc.. Passport offers a varied set of such mechanisms in the form of different packages, so that the developer doesn’t have to be burdened with extra dependencies.

    app.post('/login', passport.authenticate('local', { successRedirect: '/',
                                                        failureRedirect: '/login' }));
    


    As you can see in this route, passport.authenticate() is a middleware in the Express app route. In the passport authentication, ‘local’ option is opted which means using a custom username and password instead of OAuth through Facebook, Twitter or any other such provider. If the authentication is successful, then the user is redirected to the route ‘/’ and if it fails then the user is redirected to ‘/login’.

    User Management as a Service

    These are services such as Stormpath/Okta, Keycloak and Auth0. Over time, software has moved from on-premise to the cloud, to now a distributed API service. These technologies provide Identity Management APIs for software teams building web, mobile and API driven applications.

    Identity management (ID management) is the organizational process for identifying, authenticating and authorizing individuals or groups of people to have access to applications, systems or networks by associating user rights and restrictions with established identities.

    Such pre-built authentication and user management cut down cost & security risk of developing and maintaining identity in house. As a result, developers can focus on the core features instead. Compared to middleware modules, these provide more features than just securing endpoints. This includes email account verification, password reset workflows, role-based access, two-factor authentication and so on.

    But introducing 3rd party services always has the requirement to be highly available, fast, portable, provide security during transport and most importantly provide flexibility based on the user model. These conditions vary vastly from service to service and an in-depth study needs to be done of all these before adopting a service.

    Stormpath is one such service that offers identity management APIs. It is a cloud-based user data storage system with an option for private deployment. Features include user registration, authentication, authorization, user profiles, single-sign-on, multi-tenancy, token authentication, and API key management. It has an open source SDK present for most popular languages like Node.js, Angular.js, Java, PHP, Python, Ruby, .NET, iOS, Android.

    Stormpath also supports easy integration with Passport.js.

    var spClient = new stormpath.Client({ apiKey: apiKey });
     
      // Grab our app, then attempt to create this user's account.
      spClient.getApplication(process.env['STORMPATH_APP_HREF'], function(err, app) {
        if (err) throw err;
     
        app.createAccount({
          givenName: 'John',
          surname: 'Smith',
          username: username,
          email: username,
          password: password,
        }, function (err, createdAccount) {
          if (err) {
            return res.render('register', { title: 'Register', error: err.userMessage });
          }
     
          passport.authenticate('stormpath')(req, res, function () {
            return res.redirect('/dashboard');
          });
        });
      });
    });
    


    This showcases a part of how working with Stormpath would be for a developer. Here the createAccount() feature of Stormpath is being showcased. As you can see that Passport.js is also being used and the ‘stormpath’ strategy is chosen.

    Custom Database and Authentication

    This is the more do-it-yourself approach, where the developer builds the whole authentication architecture from scratch. It first starts with choosing your tech stack, database, hashing algorithm, method of maintaining sessions and so on. After this, the next part would be to build the user management service.

    It is a common task as it is intrinsic to almost any real world project. But it is prone to error - as anything built from scratch suffers from. Moreover, there is a hefty amount of code to be maintained too. But this strategy provides the most amount of flexibility and freedom to the developer.

    A traditional stack for achieving this would be to use a database like MongoDB or PostgresQL. Pick the required ORM like sequelize or mongoose with them. Bcrypt is a popular hashing algorithm which also has npm packages for its easy implementation.

    After this, routes need to be created for account creation, user verification, login and password reset. Thereon, an authentication logic is written to secure the different endpoints, and even the database needs to be secured from unauthorized access using secret keys.


    C. Data Structure/ Algorithm

  • 1. Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of brackets. Open brackets must be closed in the correct order. Note that an empty string is also considered valid.


    class ValidParentheses{
        func isValid(_ s: String) -> Bool {
            var stc = [Character]()
    
            for char in s {
                if char == "(" || char == "[" || char == "{" {
                    stc.append(char)
                } else if char == ")" {
                    guard stc.count != 0 && stc.removeLast() == "(" else {
                        return false
                    }
                } else if char == "]" {
                    guard stc.count != 0 && stc.removeLast() == "[" else {
                        return false
                    }
                } else if char == "}" {
                    guard stc.count != 0 && stc.removeLast() == "{" else {
                        return false
                    }
                }
            }
            return stc.isEmpty
        }
    }
    

    The above code will input 0(false). 
  • 2. What will the output of the following code be?


    var a = 10;
    var b = 5;
    var c = 3;
    if (a / b / c)
         document.write("hi");
    else
        document.write("hello");
    a) hi
    b) hello
    c) error
    d) no output

    The answer is A because the floating-point division returns a non zero value = 0.66 which evaluates
    to true and outputs ‘hi’.
  • 3. What will the output of the following code be?


    var p = 2;
    var q = 4;
    var r = 6;
    if (p > q > r)
         document.write("true");
    else
        document.write("false");

    The answer is False. It may look like the output can be true because 6 > 4 > 2 is true, but PHP evaluates $z > $y 
    first, which returns a boolean value of 1 or true. This value (true or 1) is compared to the 
    next integer in the chain, bool(1) > $z, which will result in NULL and echo “false.”

    Parting thoughts


    That is everything you need to know about hiring a freelance NodeJS developer. As discussed, it isn't easy to find a quality freelance NodeJS developer but this guide makes the process easier for you. To offload the entire hiring process, reach out to us at Flexiple. We've designed a high-quality, 6-step screening process to find the top 1%, freelance developers. You can find the best freelance NodeJS developers here. We've already served over a hundred clients, earning great reviews for the quality of service.

    Lastly, to quickly summarize it for you:
    1. Note your project requirements and hire accordingly. Do not go for the lowest or the highest-paid developer.
    2. Don’t hire without vetting- consider asking questions right from the basics to advanced to logical questions.
    3. Look for companies like Flexiple that help you find the perfect fit.

    Happy hiring! :)
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