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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UKCloud Ltd
Web Development · Web Design · IT Services
UKCloud, the multi-cloud experts. We are dedicated to exclusively helping the UK Public Sector, delivering more choice and flexibility through safe and trusted cloud technology.
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Foehn
Web Development · Web Design · IT Services
Foehn is a multi-award winning provider of cloud communications technology, delivering IP telephony and contact centres to the private and public sectors since 2000.
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UCi2i
Web Development · Web Design · IT Services
Why UCi2i? Secure, HD quality, easy-to-use and to manage, on any device or network, and support The smarter, affordable way to communicate face-to-face, wherever you are.
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Managed IT Services LTD
Web Development · Web Design · IT Services
Managed IT Services (MITS) are award-winning Cybersecurity and professional IT services experts.
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Preventon (Security Software Limited)
Web Development · Web Design · IT Services
Preventon is a leading supplier of whitelabel software for the ISV’s.
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Karlson
Web Development · Web Design · IT Services
In a world where paperless workplaces remain impractical, we help businesses achieve bespoke paper-lite realities.
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Crikle
Web Development · Web Design · Software Development
Crikle is a sales lead conversion and revenue growth platform servicing businesses in the travel and hospitality industry.
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Gamma
Web Development · Web Design · IT Services
Gamma is a leading supplier of voice, data and mobile products and services in the UK.
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TSI
Web Development · Web Design · IT Services
TSI helps organizations of all sizes, across multiple sectors, keep their communications ahead of the curve. How? Well, it’s simple really.
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Blocksmith
Web Development · Web Design · IT Services
Blocksmith is a blockchain studio based in London! A spin-off of Whitesmith, a product studio established in 2012, and supported by KR1, Europe's leading public crypto investment…
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CyLon
Web Development · Web Design · IT Services
At CyLon, we find, grow and invest in the world's best emerging cyber businesses. Our global platform focuses exclusively on growing cybersecurity businesses.
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Rosslyn Data Technologies
Web Development · Web Design · IT Services
Rosslyn Data Technologies (AIM: RDT), aka Rosslyn Analytics, helps organizations create new business value from previously inaccessible data.
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Socitm
Web Development · Web Design · IT Services
Socitm is the professional network for digital leaders in the transformation of local public services.
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DSP
Web Development · Web Design · IT Services
Our clients benefit from databases & applications that are highly responsive, secure and regularly benchmarked against best practice, whether they be onsite, hosted or in a Public…
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SPOR AV Limited
Web Development · Web Design · IT Services
SPOR AV has been established since 2019 following the founding directors' successful career working with Fortune 100 companies within their previous roles.
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Brandpie
Web Development · Web Design · IT Services
Smart thinking. Big ideas. Brilliant execution. We created Brandpie in 2008 as a different type of agency.
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askporter
Artificial Intelligence - AI · Web Development · Web Design
AskPorter is an AI messaging platform that optimizes property & facilities management, reducing admin and the cost of management, whilst improving customer satisfaction.
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Anatwine
Web Development · Web Design · IT Services
Big or small, fashion brands all have the same goal; to connect with more consumers and sell more products.
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nPlan
Artificial Intelligence - AI · Web Development · Web Design
At nPlan we are building the world's first system to understand construction project planning.
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OKI Europe Ltd
Web Development · Web Design · IT Services
OKI Europe Ltd is a global business-to-business brand dedicated to creating cost-effective, professional in-house printing solutions that are designed to increase the efficiency of…
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Silverchip Ltd
Mobile App Development · Web Development · Web Design
We’re experts at creating technology that nurtures business growth.
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intY, a ScanSource Company
Web Development · Web Design · IT Services
intY is an award-winning pioneer for the distribution of cloud services from the biggest Cloud software vendors in the world, including Microsoft, Acronis, and Symantec.
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Atlas City Global
Artificial Intelligence - AI · Web Development · Web Design
Atlas City enables your business to realize the full potential of distributed ledger technology.
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Sandhata Technologies
Web Development · Web Design · IT Services
We are a global niche consultancy specializing in services that span all facets of IT transformation, Integration, DevOps and Continuous Delivery.
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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

UKCloud Ltd

Foehn

UCi2i

Managed IT Services LTD

Preventon (Security Software Limited)

Karlson

Crikle

Gamma

TSI

Blocksmith

CyLon

Rosslyn Data Technologies

Socitm

DSP

SPOR AV Limited

Brandpie

askporter

Anatwine

nPlan

OKI Europe Ltd

Silverchip Ltd

intY, a ScanSource Company

Atlas City Global

Sandhata Technologies