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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Ceterna
Social Media Marketing · Web Development · Web Design
New or established - we understand your rapidly growing business. As you grow, so do the needs of your customers, employees, and partners.
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Decode Studios
Mobile App Development · Web Development · Web Design
Decode Studios was set up by Founder and Technical Director, Dan Brennan in 2008.
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Canonical Ltd.
Web Development · Web Design · IT Services
At Canonical, we believe in the power of open source to change the world Canonical was created alongside Ubuntu to help it reach a wider market.
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KIVALUE
Web Development · Web Design · IT Services
We are a team of specialists passionated about data intelligence and innovations, leveraging cross-industry expertise in transformation.
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Content and Code
Web Development · Web Design · IT Services
Content and Code solves business challenges with creative IT solutions.
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383
Search Engine Optimization · Web Development · Web Design
We’re 383, a digital studio using the best people to create and make the right experiences for our clients.
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Torsion Information Security
Web Development · Web Design · IT Services
TORSION delivers Secure Data Access Control, invisibly integrated with your business and IT.
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Endless Gain
Web Development · Web Design · IT Services
Optimising online human behaviour. We create, optimise and personalise customer experiences to increase revenue for our clients.
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ConnectNow
Web Development · Web Design · IT Services
A game-changing Web Chat system, designed around Support and Service.
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Inhealthcare
Web Development · Web Design · IT Services
Inhealthcare is a digital health and telehealth provider working with NHS organizations to digitize care.
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Humanotics
Web Development · Web Design · IT Services
Humanotics’ mission is to demystify complex Artificial Intelligence technologies to power better human experiences.
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Securience
Web Development · Web Design · IT Services
Securience is an organization specializing in Identity Management, Access and Governance solutions.
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Matillion
Web Development · Web Design · IT Services
Matillion is data transformation for cloud data warehouses. Only Matillion is purpose-built for Amazon Redshift, Snowflake, and Google BigQuery enabling businesses to achieve new…
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GatherContent
Web Development · Web Design · UI/UX Design
GatherContent is a Content Operations Platform that helps teams produce effective content, at scale.
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nCipher Security
Web Development · Web Design · IT Services
nCipher Security, an Entrust Datacard company and a leader in the general-purpose hardware security module (HSM) market, empowers world-leading organizations by delivering trust,…
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Virtue Technologies
Web Development · Web Design · IT Services
Virtue Technologies is a leading provider of IT solutions to Primary and Secondary schools, Academies and Multi-Academy Trusts, FE colleges and Universities.
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iSize Technologies
Web Development · Web Design · IT Services
We address the delivery limitations and high delivery costs that comes with an increasing number of high-quality video being streamed over the internet.
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SIPCOM
Web Development · Web Design · IT Services
SIPCOM is a global & leading cloud service provider (CSP) specializing in delivering Software as a Service (SaaS) that includes Unified Communications as a Service (UCaaS) and…
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Cevitr
Web Development · Web Design · IT Services
Cevitr is a UK based company, formed with the philosophy of complementing the automation technology with a simple business engagement model thereby enabling organizations of all…
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Giacom
Web Development · Web Design · IT Services
Giacom is a long-established IT service provider working with top vendors across the globe to deliver the biggest and best cloud solutions.
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Twenty Eighty Online
Mobile App Development · Web Development · Web Design
An Oxfordshire based digital agency offering custom WordPress websites. We also offer a suite of hosting and support solutions.
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ProtectBox Ltd
Web Development · Web Design · IT Services
Cybersecurity comparison website & marketplace that automates the buying of cybersecurity (technology, people, processes) to be quick, simple and affordable for small and medium…
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Synetec
Web Development · Web Design · IT Services
Synetec is the trusted partner for reliable bespoke software solutions for operationally-critical environments.
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BroadGroup
Web Development · Web Design · IT Services
We are BroadGroup. BroadGroup was founded in 2002 with the aim of providing senior IT infrastructure executives and the enterprises they service a new perspective.
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For vendors

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The order is earned: ratings, verified reviews and listing quality decide it, and nobody can pay to move up. There are two ways to stand out, and each one says what it is.

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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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More on TrustList

Everything here links back to the same verified catalogue. Pick your next stop.

Top IT Service Providers for JavaScript in the UK

Ceterna

Decode Studios

Canonical Ltd.

KIVALUE

Content and Code

383

Torsion Information Security

Endless Gain

ConnectNow

Inhealthcare

Humanotics

Securience

Matillion

GatherContent

nCipher Security

Virtue Technologies

iSize Technologies

SIPCOM

Cevitr

Giacom

Twenty Eighty Online

ProtectBox Ltd

Synetec

BroadGroup