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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Scape Technologies
Web Development · Software Development · Machine Integration
Scape seeks to unify human-machine understanding by connecting the physical and digital world.
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Core Technology Systems
CRM Development · HTML5 · CSS3
For 26 years, Core has been delivering technology consultancy to a range of industries. We are a Microsoft Gold Partner offering services around the entire Cloud platform.
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XsellTeam
Web Development · Web Design · IT Services
Outsourced Managed Sales & Marketing - Enabling Business Growth.
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Channeliser
Web Development · Web Design · IT Services
Channeliser Solutions provide technology for IT business selling through a channel.
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OutThink
Web Development · Web Design · IT Services
An innovative, disruptive solution, OutThink redefines and evolves security awareness.
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Bico AI
Web Development · Web Design · IT Services
BICO AI is an Artificial Intelligence company focused on developing solutions to solve the complex challenges our clients and partners face.
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Stone Group Ltd
Web Development · Web Design · IT Services
It's our mission to improve the education, health, and quality of life of people in the UK through technology.
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Avoira
Web Development · Web Design · PHP
Avoira is the fusion of four business entities: Pennine, Videonations, Co-Channel, and also Rocom (from January 2020) into one new company.
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Athena Vaults
Web Development · Web Design · IT Services
Athena Vaults provides a holistic solution to your digital business requirements; Draw on leading industry experience and future-focused service to grow your business without…
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LDeX
Web Development · Web Design · IT Services
LDeX is a respected and trusted provider of data centre services and connectivity.
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cool Data Centres Limited
Web Development · Web Design · IT Services
Established in 2017, coolDC® – cool Data Centres Limited – offers a step-change in how data centres are designed, built, and operate.
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thinkWhere
Web Development · Web Design · IT Services
thinkWhere use leading-edge cloud, Open Source, and GIS technologies, to develop innovative software and solutions, backed by a wide range of GIS implementation, consultancy,…
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Plexal
Web Development · Web Design · IT Services
Designed and built in the heart of Olympic east London, Plexal is the innovation centre and coworking space for people with big ideas.
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Ashton Court Group Ltd
Web Development · Web Design · IT Services
Ashton Court Group Ltd is an experienced client-focused information systems consultancy providing on-premise, cloud, and hybrid solutions to the public, private, and not-for-profit…
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Britecloud
Web Development · Web Design · IT Services
Britecloud is a deeply technical Value Added Distributor - the UK based, working globally.
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Landmark Information
Web Development · Web Design · IT Services
Landmark Information, part of the Daily Mail General Trust, is the UK’s leading provider of land and property search information, including digital mapping, environmental risk…
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Datanet
Web Development · Web Design · IT Services
With 20+ years of experience in hosting and connectivity and having won some 17 award nominations and awards, Datanet is an established leader in providing business-class cloud…
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Marmot Labs Ltd
Mobile App Development · Web Design · UI/UX Design
We are a team of passionate technologists on a mission to make training and coaching programs work.
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Konvergent Ltd
Web Development · Web Design · IT Services
Konvergent’s dynamic service model has been specifically developed to support Strategy and Architecture leaders.
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Aditinet UK
Web Development · Web Design · IT Services
Aditinet UK is an independent professional service partner working with the channel and specialising in advanced solutions for Networking, Security, Mobility and Data Centre design…
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Grillatech
Web Development · Web Design · IT Services
Grillatech specializes in Cyber-Security solutions that enhance, or replace legacy technologies.
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IPONWEB
Web Development · Web Design · IT Services
IPONWEB is a pioneer and global leader in the engineering of advanced programmatic, RTB, and media trading platforms across digital, TV, DOOH, and audio.
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Chester Solutions Ltd
Mobile App Development · Web Development · Web Design
The directors of the business have over 12 years of experience working in the industry.
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Velocix
Web Development · Web Design · IT Services
We are Velocix, the world’s leading provider of content delivery solutions, origin and storage technology, and stream personalization software, and we are making video personal.
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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

Scape Technologies

Core Technology Systems

XsellTeam

Channeliser

OutThink

Bico AI

Stone Group Ltd

Avoira

Athena Vaults

LDeX

cool Data Centres Limited

thinkWhere

Plexal

Ashton Court Group Ltd

Britecloud

Landmark Information

Datanet

Marmot Labs Ltd

Konvergent Ltd

Aditinet UK

Grillatech

IPONWEB

Chester Solutions Ltd

Velocix