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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Tech Nation
Web Development · Web Design · IT Services
We believe the UK is the best place in the world to start and grow a digital business Tech Nation empowers ambitious tech entrepreneurs to scale faster through growth programmes,…
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IMImobile
Web Development · Web Design · IT Services
IMImobile is a UK based, global cloud communications software and solutions provider that enables companies to use mobile and digital technologies to improve and automate customer…
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Pinewood Technologies
Web Development · Web Design · IT Services
Pinewood Technologies provides dealer management software and support services to motor retailers and fleet providers in the UK and internationally.
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Serco
Web Development · Web Design · IT Services
Serco is one of the world’s largest providers of public services to Governments, employing over 50,000 people in over 20 countries.
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Smart Cookie Design Ltd
Mobile App Development · Search Engine Optimization · Web Development
Smart Cookie Design is an Ecommerce specialist agency and Shopify Experts helping businesses of all sizes grow online. Based in London.
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Product Hub Hob
Web Development · Web Design · UI/UX Design
Or, looking to get into Product Management? Then we have a lot in common.
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ActiveOps
Web Development · Web Design · IT Services
ActiveOps is a leading provider of digital operations management solutions to financial services, BPOs, shared services, governments, healthcare and other service industries.
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Echo-U Ltd
Web Development · Web Design · IT Services
We're an established contact center creating growth for many of the UK's biggest brands by managing their customer relationships.
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Symology
Web Development · Web Design · IT Services
Symology is the UK's leading provider of Street Works Management solutions and a leading supplier of integrated Highway Asset Management solutions.
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PassivSystems
Search Engine Optimization · Web Development · Web Design
Since 2008 PassivSystems have been at the forefront of developing leading-edge smart-home technology for the mass market.
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Z-CARD
Web Development · Web Design · IT Services
Z-CARD is the global specialist in PocketMedia. We believe that successful marketing is all about simple ideas, brilliantly executed, that reinforce your brand message.
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IRIS Software Group
Web Development · Web Design · IT Services
We know your business success lies in getting critical operational tasks right first time, every time, as simply as possible.
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ESG Global
Web Development · Web Design · IT Services
ESG is an outsourcing company engaged in all IT processes, business processes, KPO & RPO.
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Hortor Limited
Web Development · Web Design · IT Services
Hortor is an established global strategic resourcing consultancy, founded by two entrepreneurs with extensive corporate experience.
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Bromcom
Custom Software Development · Web Development · Web Design
Bromcom has 25+ years’ experience providing innovative, leading edge award winning IT solutions to schools, colleges & local authorities that demanded more from their IT.
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Opencast Software
Web Development · Web Design · IT Services
Opencast Software is an Enterprise IT Consultancy that works with corporate IT departments to deliver their change.
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Cutover
Web Development · Web Design · IT Services
Cutover, the leader in work orchestration and observability, is the only platform that provides full organizational visibility into dynamic flows of work, bringing them out of the…
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Vaxtor Recognition Technologies
Custom Software Development · Web Development · Web Design
Software for license plate recognition in the most demanding scenarios. We develop high-performance products and solutions for license plate recognition in any scenario.
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BCN Group Ltd
Web Development · Web Design · IT Services
BCN was formed in Wilmslow, just south of Manchester, in 2009 by two entrepreneurs Simon Kelf and Matt Smith.
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Outsource Accelerator
Web Development · Web Design · IT Services
Outsource Accelerator was founded by Derek Gallimore in response to the need for independent unbiased information and education on outsourcing and offshoring.
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NHS Wales Informatics Service
Mobile App Development · Web Development · Web Design
NHS Wales Informatics Service is the national organization delivering technology and first-class digital health systems and services needed for modern patient care in Wales.
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Civica
Web Development · Web Design · IT Services
Civica is a market-leading specialist in cloud software, digital solutions and managed services that help teams and organisations around the world to transform the way they work.
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Brigantia Partners Limited
Web Development · Web Design · IT Services
Brigantia is a value-added managed services distributor providing a comprehensive range of cyber-security solutions complemented by secure, enterprise-class data communications and…
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XMA
Web Development · Web Design · IT Services
Our purpose is simple. To deliver IT solutions that enable customers to evolve and transform the way they work.
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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

Tech Nation

IMImobile

Pinewood Technologies

Serco

Smart Cookie Design Ltd

Product Hub Hob

ActiveOps

Echo-U Ltd

Symology

PassivSystems

Z-CARD

IRIS Software Group

ESG Global

Hortor Limited

Bromcom

Opencast Software

Cutover

Vaxtor Recognition Technologies

BCN Group Ltd

Outsource Accelerator

NHS Wales Informatics Service

Civica

Brigantia Partners Limited

XMA