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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Trunomi
Web Development · Web Design · IT Services
Trunomi is the multi-award-winning Consent Management and Personal Data Rights Platform driving a new level of transparency and trust between business and consumers.
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Virgin Media
Web Development · Web Design · IT Services
We help to create a digital world that makes good things happen: for our customers and the communities in which we operate.
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Daisy Corporate Services
Web Development · Web Design · IT Services
Founded by current Chairman, Matthew Riley in 2001, Daisy is a group of four independent businesses providing digital infrastructure products, services, and solutions to business.
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Exponea
Web Development · Web Design · IT Services
We envision a future where online retailers, banks, and telco companies truly understand their customers, resulting in the sustainable growth of their businesses’ profitability.
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WRM Media Ltd
Web Development · Web Design · IT Services
WRM-Media specialises in email marketing and lead generation services.
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Permutive
Web Development · Web Design · UI/UX Design
Permutive is the only publisher data platform built on edge computing.
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Virtual Clarity
Web Development · Web Design · IT Services
With a focus on digital transformation and implementing the best cloud systems, Virtual Clarity makes IT-as-a-Service happen in the largest, most critical environments by aligning…
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Digital Craftsmen
Web Development · Web Design · IT Services
Digital Craftsmen is dedicated to helping organizations migrate to and operate safely and productively in the cloud.
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Livingstone Tech
Web Development · Web Design · UI/UX Design
Livingstone is an impartial, trusted advisor for the asset intelligence, governance and compliance needs of the modern digital enterprise.
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Interlink Software
Web Development · Web Design · IT Services
Our highly scalable AIOps (Algorithmic IT Operations) solutions provide centralized insight, action, and automation for the management of critical infrastructure and visualization…
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OnApp
Web Development · Web Design · IT Services
OnApp makes cloud fast, easy & profitable for Telcos, MSPs & other cloud service providers.
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Strategic Blue
Web Development · Web Design · IT Services
Founded in 2010, Strategic Blue is helping the world’s cloud buyers get a better deal by accelerating and optimizing the procurement of cloud resources.
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Bell Integration
Web Development · Web Design · IT Services
Bell Integration is a leading IT Services and Consulting business, dedicated to making the difficult feel easy for our customers.
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Syntax Integration Limited
Web Development · Web Design · IT Services
Syntax Integration has over 25 years of experience providing IT support and services in London.
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Matsco Solutions
Web Development · Web Design · IT Services
Matsco Solutions is a leading global managed IT service provider focused on the financial services industry.
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Entegraty
Web Development · Web Design · IT Services
At Entegraty we take the time to get to know our clients – from their objectives and the challenges they face to their industries and competitors – so that we can consistently…
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5NINES Global
Web Development · Web Design · IT Services
The world's leading privately held global data centre colocation and development company 5NINES provides smart data centre colocation and wholesale service from its global data…
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Colt Technology Services
Web Development · Web Design · IT Services
Colt provides high bandwidth services for enterprises and wholesale customers in Europe, Asia, and North America’s largest business hubs.
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Kaminario
Custom Software Development · ERP Software Development · Web Development
Kaminario is making the autonomous datacenter a reality, letting customers stay focused on scaling their business.
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Cloud Optics Limited
Web Development · Web Design · IT Services
Cloud Optics equip you with the confidence and strategy to reverse the balance of power when engaging with IBM, Microsoft, Oracle & SAP.
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QUANTIQ
Web Development · Web Design · IT Services
QUANTIQ is the only Microsoft Partner in the UK that has the ability to sell, implement and support Dynamics 365, Business Central, AX, CRM, GP, NAV and Business Intelligence…
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Recycling Lives Ltd
IT Services · HTML5 · CSS3
Recycling Lives Ltd. is an award-winning recycling and waste management services provider, and a champion of UK communities.
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CDL Software
Web Development · Web Design · Software Development
CDL is a market leader in software solutions for high volume retail insurance operations and is highly regarded as an independent, financially stable and trusted partner.
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iRiS Software Systems Ltd
Mobile App Development · iOS App · Software Development
iRiS is a global leading enterprise applications platform provider creating innovative mobile and web solutions for the hospitality industry.
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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

Trunomi

Virgin Media

Daisy Corporate Services

Exponea

WRM Media Ltd

Permutive

Virtual Clarity

Digital Craftsmen

Livingstone Tech

Interlink Software

OnApp

Strategic Blue

Bell Integration

Syntax Integration Limited

Matsco Solutions

Entegraty

5NINES Global

Colt Technology Services

Kaminario

Cloud Optics Limited

QUANTIQ

Recycling Lives Ltd

CDL Software

iRiS Software Systems Ltd