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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IOT-as-a-Service.com
Mobile App Development · Web Development · iOS App
IOT-as-a-Service.com is a company that helps customers to maximize the opportunity around IoT, by helping the customer to understand the opportunity, define the winning strategy,…
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A6 Digital
Mobile App Development · ERP Software Development · Web Development
A6 Digital is a software agency located in London & Istanbul. We are developing scalable digital projects for agencies, brands and, startups in a reasonable budget.
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Red Ninja Studios
Mobile App Development · Web Development · UI/UX Design
We are a design-led technology company, making products that people love. We involve users in design, from the first scribble of an idea, through to the product launch party.
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Webdesign7
Custom Software Development · Social Media Marketing · Web Development
Webdesign7 is a digital website design studio delivering digital business solutions for all business of all types and sizes.
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Marionete
Mobile App Development · Web Development · iOS App
Marionete is a specialist consultancy, delivering expertise in the commercial application of Big Data and Data Science technologies such as Blockchain and the Internet of Things…
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Computaris International
Mobile App Development · Web Development · iOS App
Computaris, the member of the R Systems Group, is a digital transformation and strategy consulting company with more than 25 years of experience in technology and telecom.
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Special Projects
Mobile App Development · Web Development · UI/UX Design
We are a design and invention consultancy founded by creative director and industrial designer Clara Gaggero Westaway and experience designer and magician Adrian Westaway.
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Magma Digital Ltd
Mobile App Development · Web Development · Web Design
Magma Digital was est in 1999 by Jeremy & Priscilla Coates following their careers as Occupational Therapists in the NHS.
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Cyber Noise
Mobile App Development · Custom Software Development · Web Development
Cyber Noise is a London based, boutique software development company. We specialize in the design and development of bespoke software, both web, and mobile, for startups.
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AtomicMedia
Mobile App Development · Search Engine Optimization · Web Development
AtomicMedia is an independently owned, award-winning digital agency specializing in app development, web design, and video production.
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Pyco IT Solutions Ltd
Mobile App Development · Web Development · Web Design
Pyco IT Solutions Ltd is a specialist software development company headquartered in Rochdale, northwest of Oldham and northeast of Manchester.
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ARCH
Mobile App Development · Web Development · UI/UX Design
We are an award-winning consultancy that designs & builds software across the web, mobile, and back-office for leading brands and start-ups.
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Code Wizards Ltd
Mobile App Development · Web Development · Web Design
We mix invention with engineering: producing the best solutions that automatically scale for your business! Who are Code Wizards? Good question!
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Camelot Lottery Solutions
Social Media Marketing · Web Development · Web Design
Camelot is the leading solutions and technology provider to lotteries around the world, helping customers reach new players and deliver responsible growth through increasing…
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Dev Academy UK
Web Development · Web Design · IT Services
Dev Academy was established in 2012 and following a lot of consultation with industry and government, it commenced its first course in 2014.
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Quantanite
Web Development · Web Design · IT Services
Quantanite is a global professional services company focusing on business process automation and offshoring.
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Sage
Web Development · Web Design · IT Services
Be Sage. Build on. At Sage, we transform the way people think and work, enabling their organizations to thrive.
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NashTech Limited
Web Development · Web Design · IT Services
NashTech has been delivering Consulting, Software Solutions and BPO from its development centers in Vietnam since 2000.
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Ascensos
Web Development · Web Design · IT Services
Ascensos is built on our belief that not all contact centres need be the same. We are owner-managed, quality-focused and agile offering our clients an unfair advantage.
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Skuuudle
Custom Software Development · Web Design · IT Services
Skuuudle provides retailers, distributors, and brands of all sizes with price and product intelligence, enabling them to optimize margins and increase market share through…
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OnSecurity
Custom Software Development · Web Development · Web Design
OnSecurity replaces the overhead of traditional penetration testing firms with a simple online interface.
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Innovise
Custom Software Development · Software Development · CRM Development
Innovise is a vertically focused business working with global Facilities Management and Support Services businesses to supply its market-leading line of business applications:…
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Cazoo
Web Development · Web Design · IT Services
Our mission is to transform the way people buy used cars. We realized that whilst people love their cars, they don’t always like the process of buying and selling them.
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Kalibrate
Custom Software Development · Web Development · Web Design
Kalibrate’s decision-making software empowers fuel and convenience retailers across the globe with the market intelligence, micro-local data, and precision pricing and planning…
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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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Everything here links back to the same verified catalogue. Pick your next stop.

Top IT Service Providers for JavaScript in the UK

IOT-as-a-Service.com

A6 Digital

Red Ninja Studios

Webdesign7

Marionete

Computaris International

Special Projects

Magma Digital Ltd

Cyber Noise

AtomicMedia

Pyco IT Solutions Ltd

ARCH

Code Wizards Ltd

Camelot Lottery Solutions

Dev Academy UK

Quantanite

Sage

NashTech Limited

Ascensos

Skuuudle

OnSecurity

Innovise

Cazoo

Kalibrate