Companies · category

Top IT Service Providers for JavaScript in the UK

477 IT service providers ranked by rating, review volume and listing quality.

JavaScript spans more ground than any other language on this list. It runs in every browser, on servers through Node, and inside mobile and desktop applications, so a firm listing it may be doing front-end interface work, back-end services, or both.

The useful clarification is which part of the stack, and with what. Front-end work is dominated by a handful of frameworks and the choice affects hiring for years afterwards. Back-end JavaScript competes with other server languages and is chosen for good reasons and bad ones. Ask why they would pick it for your project specifically — a clear answer indicates a team choosing tools, and a vague one indicates a team using whatever they already know.

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Between them, the 476 best-ranked of these 477 IT service providers cover web development (464), web design (380), PHP (304) and .NET (288). They also list work in London and United States of America. 473 of them have written a profile you can read before you get in touch.

We list more than 450 IT service providers in the UK listed for JavaScript development. The order comes from what each firm publishes and what has been verified about it, never from payment — at the top right now: Zepto Systems ltd, Marzee Labs and Webcurl LTD.

Before you shortlist, check

Which frameworks they use, and why for your project
Automated tests and code review as standard
Performance and accessibility targets agreed up front
How dependencies are kept up to date after launch

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Listings marked Sponsored are promoted by TrustList. They are scored like every other listing and keep the position they earn.

Zepto Systems ltd
Sponsored
Mobile App Development · Custom Software Development · Web Development · Also in Islamabad and London
We are an IT service company providing full-scale Software Development, Bespoke Solutions, Cyber Security, Managed Project Development and Remote Developers to our clients…
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Marzee Labs
Web Development · Web Design · E-Commerce Development
Your top-notch tech crew: community-driven talent and strong leadership. Hi! We are Marzee Labs, an international webshop from London (England), Porto and Setúbal (Portugal).
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Webcurl LTD
Web Development · E-Commerce Development · WordPress
Webcurl is a leading web development agency. We specialize in using Drupal content management system (CMS), open-source software and agile methodologies to develop and provide…
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Strange
Search Engine Optimization · Web Development · Web Design · Also in London
If you rated your website and marketing capabilities on the ‘good’, ‘better’ or ‘best’ scale, how would you score them?
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Pedalo Limited
Web Development · React Native · E-Commerce Development · Also in London
We were founded in 2000 with a simple ethos – to create genuine, ongoing digital partnerships with clients.
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Toru Digital
Mobile App Development · Web Development · Web Design
Discovery, UX/UI Design, Branding, Consultancy, Web Development, Apps, Integrations, Cloud, Analytics, SEO, Support and Maintenance, KPI Optimisation.
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KeyUA - Software Development Services
Custom Software Development · Web Development · React Native
KeyUA was founded in 2008 to help forward-looking entrepreneurs and execs build software solutions that achieve business goals and don't take years to develop.
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Asset Bank
Custom Software Development · Web Development · Web Design
Use Asset Bank's Digital Asset Management Software to create a fully searchable, categorised library of all your digital assets, from images to videos to simple documents.
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Miggle
PHP · Drupal · ReactJS
miggle has been in existence since 2007, with around 15 staff up to 2018, providing a full range of digital services to major clients including Air New Zealand, AOL, Brighton and…
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AddWeb Solution
Mobile App Development · Web Development · Software Development
AddWeb Solution - ISO and NASSCOM Certified Web Development IT company in Ahmedabad, India providing the best quality and cost-effective services to the clients across the globe:…
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Will Hall Online
Web Development · Web Design · UI/UX Design
This is a shortened version of an about me. There have been around 8 different incarnations of Will Hall Online over the last 7-8 years, each representing a different episode.
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Web Bespokers
Mobile App Development · Custom Software Development · Web Development
Web Bespokers is a full-service software development company that creates high-value web applications and web solutions, developing business processes using cutting-edge…
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Supersonic Playground
Web Development · Web Design · CMS Development
Supersonic Playground was founded in 2014 by Creative Director Rich Dean who, after a successful 14-year career as a Creative Designer, decided that he wanted to take everything…
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Access
Web Development · Web Design · UI/UX Design · Also in Manchester
We help brands and businesses to engage with their customers more effectively through a blend of insights, creativity, and technology.
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Beezer.com
Mobile App Development · Web Development · Web Design
Beezer.com is the fastest and one of the most cost-effective ways to create and distribute Mobile Apps.
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MadeByPi
Mobile App Development · Web Development · Web Design
MadeByPi is an award-winning digital agency with a 20-year track record of delivering new projects and streamlining existing ones.
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Elements Design Studio
Search Engine Optimization · Web Development · E-Commerce Development
Elements Design Studio is a Web Design Company based in the West Coast of Scotland. Our aim is to provide unique, modern website designs for both small and large businesses.
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Tulasi IT
Mobile App Development · Custom Software Development · Web Development
Tulasi IT boasts a team of highly skilled web designers and developers endowed with high-quality professional experience in the complete range of internet know-how.
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Digital-Labs
Web Development · Web Design · UI/UX Design
Digital-Labs is a leading design and user experience agency based in London’s Shoreditch.
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Techno Infonet
Mobile App Development · Search Engine Optimization · Web Development
Techno Infonet commenced with humble beginnings in 2004. A handpicked team of 45+ highly qualified passionate professionals has been done after meticulous evaluation.
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Arias & Thompson
Web Development · Web Design · CMS Development
Arias & Thompson Digital Consultancy consists of two location-independent principals, Ian Thompson and Maria Paula Arias, and a team of freelancers dedicated to providing…
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Apadmi Ltd
Web Development · Web Design · .NET
We’re experts in mobile technology. Since we began in 2009, we’ve built mobile apps and solutions for some of the UK’s biggest brands, including the Co-op, BBC, NHS, Land Rover…
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Rise Software Solutions
Mobile App Development · Web Development · Web Design
Rise Software Solutions is an established software company based in Dundee, North East Scotland.
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TechHuddle
Mobile App Development · Web Development · iOS App
TechHuddle is one of the fastest-growing IT companies in Bulgaria. We help companies of all sizes with their offshore IT and IT outsourcing challenges.
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How is this ranking worked out?

The order comes from what each firm publishes and what has been verified about it, and never from payment:

Profile completeness: the details a buyer needs to judge a firm — what it does, who it serves, how it prices, who it has worked for
Earned trust: verification, awards and the other checks a firm has actually passed
Client reviews, where they exist: the rating is smoothed, so one five-star review cannot outrank a firm with a hundred good ones, and volume counts with diminishing returns

Client reviews are still rare across this catalogue, so on most lists today the order is set by the first two. A firm near the top is the best-documented and best-verified one we hold, which is not the same claim as the best one to hire. Use the list to build a shortlist, then check the firms yourself.

Sponsored listings are labelled and shown apart from this list. How rankings work

Only firms whose profile names the UK are counted here, so a firm that lists a town but no country is not yet included.

Where else can I look?

The same list elsewhere: USA (762) · India (392) · Germany (214) · Ukraine (145).

Other specialisms in the UK: UI/UX design (941) · e-commerce (854) · Android app development (812) · iOS app development (800) · WordPress (752).

Every IT service provider in the UK: the full list.

Every category in the UK: the UK country page.

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Top IT Service Providers for JavaScript in the UK

Zepto Systems ltd

Marzee Labs

Webcurl LTD

Strange

Pedalo Limited

Toru Digital

KeyUA - Software Development Services

Asset Bank

Miggle

AddWeb Solution

Will Hall Online

Web Bespokers

Supersonic Playground

Access

Beezer.com

MadeByPi

Elements Design Studio

Tulasi IT

Digital-Labs

Techno Infonet

Arias & Thompson

Apadmi Ltd

Rise Software Solutions

TechHuddle