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Top JavaScript Agencies

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Web Development +2

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Rompweb

London, United Kingdom

Fast-Loading Conversion Websites & Native Mobile App Builds

10 - 49

$ Min. $10,000+

$100 - $149 / hr

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</> Next.js </> Node.js </> JavaScript +4

Mobile App Development Web Design Branding +2

rompweb.com

Web Development +1

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Quencode

London, United Kingdom

AI-Enhanced Web Development & Modern UI/UX Architecture

2 - 9

$ Min. $5,000+

$50 - $99 / hr

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</> React </> Next.js </> Node.js +3

AR/VR Development Mobile App Development Custom Software Development +3

quencode.co.uk

Web Development

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Clockwork Moggy

Rochester, United Kingdom

UK Creative Graphic Design, Custom Web Engineering & Branding Studio

10-49

$ Min. $5,000+

$50 - $99 / hr

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</> React </> JavaScript </> WordPress +2

Graphic Design Content Marketing Branding +2

clockworkmogg...

Web Development +2

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Preface Studios

Farnham

Top-Rated Custom Web Engineering & SEO Optimization by Preface Studios

50-249

$ Min. $10,000+

$100 - $149 / hr

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</> React </> Next.js </> Node.js +11

Mobile App Development Web Development

preface-studi...

Web Development +1

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Technofic Lab

London, United Kingdom

Dedicated Web Design, Custom Software & Digital Systems

10 - 49

$ Min. $5,000+

$50 - $99 / hr

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</> React </> Node.js </> JavaScript +3

Web Design Other Digital Marketing Web Development +1

technofic.co.uk

Web Development +1

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Codefreex

Eastcheap, United Kingdom

Complex Front-End Web Design, UI/UX & Responsive Development

10 - 49

$ Min. $5,000+

$50 - $99 / hr

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</> React </> Vue.js </> JavaScript +2

Mobile App Development Generative AI AI Development +4

codefreex.co.uk

Web Development +1

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Hasty Head

London

Top-Rated Custom Web Engineering & SEO Optimization by Hasty Head

10-49

$ Min. $10,000+

$50 - $99 / hr

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</> React </> Next.js </> Node.js +7

Custom Software Development Website Optimization Web Development +1

hasty-head.com

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Poly Webtech

London

Full-Stack Web Development & Mobile App Solutions Provider

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</> React </> Node.js </> Laravel +7

Mobile App Development Custom Software Development Application Testing +8

polywebtech.com

Web Development +1

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Streamwork Marketing

Leighton Buzzard

Top-Rated Custom Web Engineering & SEO Optimization by Streamwork Marketing

10-49

$ Min. $5,000+

$50 - $99 / hr

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</> React </> Next.js </> Node.js +7

Custom Software Development Website Optimization Web Development +1

streamwork-ma...

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Visualytes Limited

ILFORD

Global IT Services, Software Development & Web Engineering

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</> React </> Node.js </> JavaScript +6

Mobile App Development Social Media Marketing E-Commerce Development +2

visualytes.com

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Highrise Digital

West Byfleet

Top-Rated Custom Web Engineering & SEO Optimization by Highrise Digital

50-249

$ Min. $5,000+

$100 - $149 / hr

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</> React </> Next.js </> Node.js +10

Custom Software Development

highrise-digi...

Web Development +1

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Liven Creative Ltd

Woking

Top-Rated Custom Web Engineering & SEO Optimization by Liven Creative Ltd

10-49

$ Min. $5,000+

$50 - $99 / hr

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</> React </> Next.js </> Node.js +7

Custom Software Development Website Optimization Web Development +1

liven-creativ...

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Technology Guide & Market Insights

Hiring JavaScript Agencies: Complete Guide & Overview

JavaScript is a general-purpose programming language used extensively for web development. It runs directly in web browsers for interactive interfaces and can also run on servers, desktop applications, mobile applications, and developer tools. JavaScript supports event-driven and asynchronous programming and has a large ecosystem of libraries and frameworks. It is a core technology for frontend development and is also widely used in full-stack applications through runtimes such as Node.js.

For projects using JavaScript, teams should consider the application's requirements, expected scale, integration points, deployment environment, testing approach, and long-term maintenance. Choosing the technology should also take into account the existing skills of the development team and the libraries or services already used by the product.