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

Filter by fitbudget, engagement, size and more

Pogo Studio
Mobile App Development · Web Development · iOS App
Founded in 2016, Pogo’s team already has 50 years of experience and hundreds of projects under their belt. We love to be creative, and we love to get involved.
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Somo Global
Mobile App Development · Web Development · iOS App
Through our Rapid Actionable Innovation engine, we create products and services your customers and employees will love. Somo places the customer at the heart of all we do.
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Radgost Web Lab
Web Development · UI/UX Design · E-Commerce Development
We make simple, useful software that is used by more than 500,000 businesses around the world.
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CaJSoft
Mobile App Development · Custom Software Development · Web Development
CaJSoft ltd are a small, friendly and affordable freelance web design, freelance web development and software development company based in Glasgow, Scotland.
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PLDEVS.COM
Mobile App Development · Web Development · iOS App
We've been honing our skills in custom web applications and mobile apps since 2008 starting in London. We strongly believe that nothing can't stop us.
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WeCodePlus
Mobile App Development · Web Development · Web Design
To build software is difficult, expensive and time-consuming. The market is a strange place to navigate through, and it's easy to become trapped by a highly-priced agency with…
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Space 48
Search Engine Optimization · Web Development · Web Design
We are an eCommerce consultancy with a team of strategists, creatives, developers and project managers.
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Selesti
Search Engine Optimization · Web Development · Web Design
If you’re ambitious to change and grow, you’ll need an award-winning digital partner to help you achieve commercial success.
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Desap
Mobile App Development · Web Development · iOS App
Desap is currently producing Digital Solutions and Mobile Applications with unique and groundbreaking functionality, incorporating Integrated Smart Device Technology designed to…
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techUK
Mobile App Development · Web Development · iOS App
techUK represents the companies and technologies that are defining today the world that we will live in tomorrow. 900 companies are members of techUK.
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EVRYTHNG
Mobile App Development · Web Development · iOS App
Evrythng Is the Market Leading Internet of Things SAAS Platform for Consumer Products Brands and their service providers work with EVRYTHNG to apply data science intelligence on an…
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Digital Catapult
Mobile App Development · Web Development · iOS App
At Digital Catapult we truly believe in our values and delivering these in our business culture for employees and partners.
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Eseye
Mobile App Development · Web Development · iOS App
Eseye is the one global IoT cellular connectivity and hardware company that delivers business outcomes from idea to implementation for Systems Integrators, MNOs, and Device…
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balena
Mobile App Development · Web Development · iOS App
Balena is a complete set of tools for building, deploying and managing fleets of connected Linux devices.
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Four Group
Mobile App Development · Web Development · iOS App
Four Group are a fashion company with a diverse and impressive brand list.
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The BIO Agency
Mobile App Development · Web Development · UI/UX Design
BIO is an award-winning digital agency consulting and delivering on customer experience-led innovation and transformation.
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CyanConnode
Mobile App Development · Web Development · iOS App
CyanConnode is a world leader in the design and development of Narrowband RF mesh networks that enable Omni Internet of Things (IoT) communications.
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Purepoint
Mobile App Development · Web Development · UI/UX Design
Delivering tomorrow, today. Every business has its own personality. Their own challenges. We understand software is just a tool – a means to an end.
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Chirp
Mobile App Development · Web Development · iOS App
We transfer data over the sound, using only a speaker and microphone, and without requiring any network connection.
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SAM Labs
Mobile App Development · Web Development · UI/UX Design
SAM Labs is an ed-tech company that empowers teachers with the most engaging STEAM solution including lesson plans, apps, and electronics.
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LaMetric
Mobile App Development · Web Development · iOS App
LaMetric is a smart home company that produces clocks and lighting, different by design and versatility.
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SwarmOnline Ltd
Mobile App Development · Web Development · UI/UX Design
SwarmOnline is a leading Scottish provider of bespoke cloud and mobile apps.
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Senseye
Mobile App Development · Web Development · iOS App
Sensei ’sen,sā, sen’sā noun (pl.same) (in martial arts) a teacher.
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Cornflake
Mobile App Development · Web Development · iOS App
By designing bespoke home automation systems and expertly integrating them into your home we handle all the technical complexities so you can enjoy a beautifully simple, immersive…
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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

Pogo Studio

Somo Global

Radgost Web Lab

CaJSoft

PLDEVS.COM

WeCodePlus

Space 48

Selesti

Desap

techUK

EVRYTHNG

Digital Catapult

Eseye

balena

Four Group

The BIO Agency

CyanConnode

Purepoint

Chirp

SAM Labs

LaMetric

SwarmOnline Ltd

Senseye

Cornflake