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Are you looking to hire a dedicated JavaScript developer? Hire Sajjan Kumar Jha, a top-rated JavaScript developer from Kolkata, India, to build simple and complex enterprise-level websites, software, and apps on monthly, part-time, or hourly terms, ensuring high-quality, timely delivery of simple applications to complex portals.
Hire a JavaScript developer with expertise in all JavaScript frameworks for dynamic and interactive website, software, and app development. Hire a JavaScript developer for excellence in the following: Node.js, Express.js, React.js, Vue.js, AngularJs, Next.js, React Native, and jQuery.
JavaScript (JS) is a high-level, cross-platform, object-oriented, and lightweight interpreted (or just-in-time compiled) programming language and core technology of the web to make web pages interactive. Web browsers have a dedicated JavaScript engine that executes the client code. JavaScript is everywhere, from a small startup to a big company; most of them are working on this language to build various kinds of applications.
JavaScript is the default language of the internet. JS code can run and be tested in any web browser without creating a special development environment or any kind of setup in the text editor.
JavaScript is so beginner-friendly that anyone can learn without any previous coding experience. JS works in the web browser; there is no need to set up any kind of specific development environment.
JavaScript has a wide range of usages, including web for both frontend and backend, mobile, desktop, smartwatch, big data and cloud, game development, blockchain, automation, ML, and AI.
JavaScript is platform-independent, which means it can run on any OS, including Windows, Linux, and macOS. This makes it easy to work on different platforms and deploy on any server.
JavaScript is highly scalable and can handle large volumes of traffic without compromising performance. It is easy to add new servers to a JS application, making it simple to scale up as needed.
JavaScript frameworks are very helpful. Ex: frontend (Vue, React, and Angular.js), backend (Node, Nest, and Express.js), mobile (React Native, Flutter, Ionic, and PhoneGap), and ElectronJS for desktop.
JavaScript is a 100% free open-source programming language that is freely available for anyone to use, modify, and distribute without any cost. JavaScript can be installed quickly and at zero cost.
JavaScript is a flexible language that can be used for a wide range of web applications for both frontend and backend, mobile apps, desktop apps, games, blockchain, automation, ML, and AI.
JS is a highly secure and reliable language that has built-in security features that make it secure against common web vulnerabilities like SQL injection and cross-site scripting (XSS).
JavaScript frameworks can be integrated with a wide range of DBs and third-party applications, including PostgreSQL, MongoDB, and MySQL. This makes it easy for developers to build applications.
Looking to hire an experienced JavaScript developer for web, mobile, and desktop application needs? Hire Sajjan Kumar Jha, a top-rated and professional freelance JavaScript developer in Kolkata, India, to provide robust solutions for your websites and apps.
Are you looking for a talented JavaScript web developer to build entire web applications? Hire a JavaScript developer to create beautiful web interfaces by using frameworks and libraries such as React.js, Angular.js, Vue.js, Node.js, Nest.js, and Express. JavaScript is very popular for building entire web applications for both the frontend and backend, like full-stack development.
Are you looking for a skilled JavaScript mobile app developer, like React Native, PhoneGap, Flutter, or Ionic? Hire Sajjan Kumar Jha, an expert React Native developer, to build remarkable and interactive mobile apps for both iOS and Android devices. Hire a dedicated freelance PhoneGap developer to create native-like mobile functionality through JavaScript API calls.
Hire a JavaScript developer to build the desktop app with the help of Electron (reuse web app elements to save time and money), NW.js (combines Node.js and Chromium engines to load local websites, connect with the OS, and access local files), AppJS (cross-platform app development using HTML, CSS, and JS), and Proton Native (uses native tools to build cross-platform desktop apps).
Hire a dedicated JavaScript developer to create an automation application for your day-to-day workflow to avoid repetitive tasks such as updating things at several places or following people on Instagram. Hire a JavaScript developer to create automation tools for third-party software like Photoshop, so a lot of boring stuff that consumes a lot of time can be automated.
Hire a skilled JavaScript module developer to develop any JavaScript modules to extend the features of the website. Hire an expert JavaScript developer to build interactive JavaScript modules for SEO, subscriptions, popups, wholesale, digital downloads, reviews, upsells, users, e-commerce, discounts, marketing, chat, wishlists, FAQs, inventory, invoices, and tracking.
Looking for a talented freelance JavaScript-based framework developer to build high-performance websites and apps? Hire Sajjan Kumar Jha, an experienced JavaScript developer, to develop JavaScript-based framework websites and apps like React.js, Angular.js, Vue.js, Node.js, Nest.Js, Express.js, React Native, Flutter, Ionic, PhoneGap, ElectronJS, AppJS, NW.js, and Proton Native.
Are you planning to switch your existing website to JavaScript or upgrade your website? Hire a JavaScript developer to ensure a smooth and hassle-free migration while maintaining data integrity and minimal disruption. Hire a dedicated JavaScript developer to migrate your existing websites or apps from a parallel tech stack into the JavaScript platform and upgrade for feature enhancements.
Looking for a professional JavaScript SEO expert to improve the ranking of your website on various search engines such as Google, Yahoo, and Bing so customers find your high-performance JavaScript website when searching for related topics? Hire a freelance JavaScript SEO expert to get indexed and listed, drive high rankings and more traffic, and increase sales conversion rates.
Hire a freelance JavaScript developer to optimize the speed and performance of your website to offer a great user experience and drive more traffic. As an expert JavaScript developer, we use speed test tools like Google PageSpeed Insights, WebPageTest, GTMetrix, UpTrends, YSlow, Sucuri Load Time Tester, and Pingdom to check the website's speed and performance across multiple devices.
Are you looking to hire a dedicated JavaScript developer for 24/7 ongoing support and maintenance on an hourly, fixed-priced, or monthly basis? Hire a freelance JavaScript developer to provide JavaScript maintenance, troubleshooting, and support services to ensure your website or app remains up and running smoothly with regular audits, upgrades, and periodic performance checks.
As an experienced freelance JavaScript developer from Kolkata, India, we focus on the needs of our JavaScript clients to provide top-quality JavaScript websites and apps and 100% satisfaction. As a top-rated JavaScript developer, we scored 4.9 out of 5.0, trusted by 275+ happy clients on over 340+ projects from the USA and all over the world.
If you need any sort of web development completed then Sajjan is the person you have to hire. He was incredible to work with as he completed the job on schedule and the quality of his work was awesome.
Nathan RicherPosted on:
Very pleased with Sajjan on this project. He addressed all my concerns in a timely manner and the end result is excellent. Very high quality work with minimal input required from me.
Maia ThornePosted on:
Working with Sajjan was great. He was very patient with me when I didn't understand things and was quick to respond to any changes I required. I would happily use Sajjan again, thank-you for your work.
Rebecca OnleyPosted on:
Sajjan is an absolute professional, I am very satisfied with his work, he was very helpful, solved the problems I presented and was also patient and willing to satisfy. I will definitely be working with him again.
Paul EroPosted on:
Sajjan was very helpful in identifying performance issues of our website. We thank him for his expertise and look forward to working with him in the future.
Sumant VasanPosted on:
Sajjan was a patient and excellent communicator and worked with me to do some basic setup on a Shopify theme. I enjoyed working with him and the job was successfully completed for the technical aspects.
Brock RichardsPosted on:
One of the best freelancers I have ever worked with. Extremely competent, affordable and fast. I will be using again.
Chris KoernerPosted on:
One of the best freelancers I have worked with. I am very happy and will continue to work together for a long time to come! :)
Sam RobertsPosted on:
Great professional, excellent communication and quality of work. I hope to work again with Sajjan in the near future!
PrÃamo JiménezPosted on:
Sajjan helped me to complete the Shopify site. I am very happy with his work. I will hire him again.
Amit RanjanPosted on:
Sajian succesfully delivered all milestones according to specification. His English skills are very good and is an excellent communicator. We will be hiring Sajjian again and highly recommend.
George BazosPosted on:
I got excellent support from Sajjan and team...He has shown lot of patience in listening to all my comments and fixed all my issues. I would with him in future...Thank you Sajjan,for the Great work..!!
Chandrika S.Posted on:
I had an emergency-type job and Sajjan had no problem fixing my site in no time at all. This is the second time I have used his service and it definitely won't be my last. He is absolutely the best on UpWork...
Nathan RicherPosted on:
Another job completed just as required. An easy freelancer to work with. Thanks again.
Rebecca OnleyPosted on:
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Hire Sajjan Kumar Jha, a highly skilled JavaScript developer from Kolkata, India, with extensive experience in every area of JavaScript development, from JavaScript startup websites or apps to enterprise JavaScript development that increases customer engagement.
Hire an experienced freelance JavaScript developer to build top-quality and high-performance JavaScript websites or apps for mobile and desktop for small to enterprise-level businesses online.
Hire a dedicated JavaScript developer to build robust and user-friendly JavaScript websites or apps for mobile and desktop on an hourly, fixed-priced, part-time, or monthly contract basis.
We keep our clients updated about every stage with regular reports to ensure that clients remain up-to-date with the project's progress. We believe in transparent pricing with no hidden costs.
We dedicately test all the specifications, functionality, loading speed and performance, security, usability, browser compatibility, and responsiveness of web pages to maintain quality assurance.
Hire a dedicated JavaScript developer to build secure, robust websites or apps for mobile and desktop on an hourly, fixed-priced, part-time, or full-time contract basis as per your requirements.
We offer 30 days of free technical assistance via email or chat in order to resolve any cosmetic updates and potential bugs, content and asset changes, design issues, code issues, or broken links.
Explore our JavaScript development projects for websites or apps for mobile and desktop that witness the professional designs and seamless functionality that our JavaScript developer crafted for our JavaScript clients across Kolkata, India, and internationally over a span of so many years.
Hire a freelance JavaScript developer by using our simple, transparent pricing models.
Starting from
Milestone-based delivery, if you have pre-defined needs and clarity of requirements.
Popular
Starting from
Pay only for the actual time utilised, ideal for ongoing updates, support, and maintenance.
Starting from
160 hours a month, ideal for IT agencies and start-ups for multiple projects.
Hire a professional JavaScript developer to build JavaScript websites or apps for mobile and desktop for large and small-scale industries in the USA, India, and all over the world.
Frequently asked questions for hiring a freelance JavaScript developer from Kolkata, India.
JavaScript is a flexible coding language that can make websites, handle server tasks, and create web, desktop, and mobile apps. JavaScript can be used across all areas of development, which reduces the need to learn multiple languages, boosts efficiency, and ensures better consistency across the software stack. JavaScript (JS) is one of the most powerful computer programming languages on the planet that runs directly in your browser, not just on a server.
JavaScript is a free and open-source language that offers exceptional value without investing heavily. JavaScript websites, software, and apps can help turbo-charge your business's growth. As an open source and free platform, JavaScript offers easy and quick setup, a lot of free tools and modules, a low cost of development, is fully customisable, has a huge community, is very fast, and requires easy maintenance.
The estimated time required to create a website, software, or app might take anywhere from a few days to a month, while more complicated JavaScript projects may take several months to finalize. The specific time period depends on various factors, such as the project scope, project complexity, and other specific requirements. Please share your JavaScript project requirements to receive a detailed proposal with a timeline and cost estimation to hire a JavaScript developer.
The exact cost involved in developing a JavaScript website, software, or app varies from project to project and depends on various factors such as the project scope, API integrations, project complexity, timeline, and other specific requirements. So it is better to share your JavaScript project details and requirements with us and receive a detailed proposal and cost estimation of your JavaScript project to select a hiring model that best suits your requirements, like hourly, fixed-priced, part-time, or full-time.
You can share your JavaScript project requirements with us and receive a detailed proposal and cost estimation to select a JavaScript hiring model that best suits your requirements, like hourly, fixed-priced, part-time, or full-time, and finally, we will start building your JavaScript website.
The estimated cost to hire a JavaScript developer is quite reasonable, starting at $20 per hour or a fixed-cost project ranging from $1000 to $20,000. The actual cost of hiring a JavaScript developer will vary based on project requirements, deadlines, and complexity. You can hire a freelance JavaScript developer to construct your remarkable JavaScript website, software, or app before the deadline on an hourly, fixed-priced, part-time, or full-time contract basis at your convenience.
Yes, sure. As a skilled JavaScript module developer, we can help you build a custom JavaScript module from scratch or customize any existing JavaScript module. Please share your full details to receive a detailed proposal and cost estimation to hire the best JavaScript module developer.
You can hire a freelance JavaScript web developer to optimize the speed and performance of your JavaScript website to offer a great user experience and drive more traffic and conversions by optimizing html, css, js, images, and videos, cleaning codes, removing unnecessary JavaScript modules, enabling caching, minimizing server requests, and using third-party performance tools. Please share your JavaScript website URL to receive a detailed proposal and cost estimation to hire an experienced JavaScript speed performance expert.
Yes, you can hire an experienced JavaScript website developer to migrate your existing website to a highly engaging JavaScript website by creating a JavaScript website and transferring the content of your existing website to the new JavaScript website to maintain data integrity with minimal disruption. Please share your full details to receive a detailed proposal and cost estimation to hire the best JavaScript developer.
Yes, sure, we offer fully signed NDA and source code security to protect and respect my clients privacy.
Yes, you can hire a skilled JavaScript API developer to integrate third-party services into your JavaScript website, software, or app by using available JavaScript modules or building a custom integration using the API. Please share your full requirements to receive a detailed proposal and cost estimation to hire a JavaScript API developer.
Yes, we offer post-launch regular support and maintenance services to keep your JavaScript website, software, or app secure, up-to-date, and optimized for performance. Our ongoing JavaScript maintenance and support service includes regular updates, security patches, bug fixes, and technical support as required. Please share your JavaScript project details to receive a detailed proposal and hire a dedicated JavaScript developer on an hourly or fixed-price basis.
Have a project in mind? or looking for a collaboration?👋 Send an email to hello@hirefreelancewebdeveloper.com.
A senior software engineer with 16+ years (since 2008) of solid experience in web and app design, development, optimization, and digital marketing.