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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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Trackener
Mobile App Development · Web Development · iOS App
Revolutionising horse health and welfare with wearable 24/7 monitoring technology.
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CorrosionRADAR
Mobile App Development · Web Development · iOS App
CorrosionRADAR strives to be a global leader in remote sensing technologies and advanced analytic systems for smart infrastructures.
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ThingTrax
Mobile App Development · Web Development · iOS App
ThingTrax is an Industrial IoT company offering Software as a Service (SaaS) based solution to the manufacturing industry helping them track, capture and analyze data from machines…
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BOLDMIND
Mobile App Development · Web Development · iOS App
An Internet of Things company delivering smart city solutions.
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Pycno Agriculture
Mobile App Development · Web Development · iOS App
Do you want to know how to save up to 70% of the water in your crops with Pycno? According to FAO data, agriculture consumes an average of 70% of existing water resources.
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Lucid Networks Ltd
Mobile App Development · Web Development · iOS App
Lucid Networks was set up in 2010 by our Directors, James & Barney, and our aim is for your business to get the most out of technology, and design your infrastructure for growth.
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Luxe Smart Homes
Mobile App Development · Web Development · iOS App
We are a Home Automation design and installation company delivering smart home solutions for high-end residential properties.
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Smart Home & Lighting Systems
Mobile App Development · Web Development · iOS App
Smart Home and Lighting Systems offer a full range in Electrical and AV installations. Smart Home and Lighting Systems offer a full range in Electrical and AV installations.
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SharpEnd
Mobile App Development · Web Development · iOS App
SharpEnd is a team of 15 thinkers, makers and doers supporting brands owners to create new touchpoints that drive engagement, revenue, and insights in the real world.
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AVITHA
Mobile App Development · Web Development · iOS App
AVITHA's mission is to help the world to adopt the latest advances in technology into everyday's life.
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Ratio
Web Development · Web Design · UI/UX Design
Our story: We set out in 2013 to become a leader in Fintech. The idea behind any Ratio product is that it needs to make life simpler for users.
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ULTRA IoT
Mobile App Development · Web Development · iOS App
We are an IoT insights startup based in London and Amsterdam. Accurate real-world data is the catalyst to improving cities and businesses.
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Mothive
Mobile App Development · Web Development · iOS App
Mothive’s vision is a world with zero food waste and sustainable agriculture. Our goal is to make the farm visible and actionable.
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Data City
Mobile App Development · Web Development · iOS App
IoT UK is a national program to amplify the UK's IoT capability.
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ROLABOTIC
Mobile App Development · Web Development · iOS App
ROLABOTIC is a fast-growing boutique firm disrupting the established consulting giants.
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Internet of Trees
Mobile App Development · Web Development · iOS App
To prevent forest fires around the world, in order to reduce the economic and environmental losses suffered by the government, agro-industrial companies, farmers, and basically…
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Ringtail Software
Mobile App Development · Web Development · iOS App
Ringtail is a software consultancy specializing in IoT, embedded and cloud systems.
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Wales Interactive Services
Mobile App Development · Web Development · iOS App
Wales Interactive is a multi-award winning video games and interactive movie publisher & developer.
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Kite Distribution
Mobile App Development · Web Development · iOS App
Kite Distribution is a value-added distributor that specializes in bringing innovative and disruptive technologies to the UK channel.
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Dufrain
Mobile App Development · Web Development · UI/UX Design
Dufrain is a market-leading Data Management, Analytics & BI consultancy.
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Metafused
Mobile App Development · Web Development · PHP
Trading, Treasury and Capital markets are under tremendous revenue and margin pressures. Being accurate and innovative with a lot less at the speed of now is imperative.
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We Talk IT
Mobile App Development · Web Development · iOS App
Our Headquarters is based in Albourne (near Brighton and Hove), United Kingdom.
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Precipice Design
Mobile App Development · Web Development · iOS App
Designing great products, brands, and business strategy are more than having the right features, latest technologies and coolest look.
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Supercharge
Mobile App Development · Web Development · Web Design
At Supercharge we create stunning digital experiences making life easier for millions of users.
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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

Trackener

CorrosionRADAR

ThingTrax

BOLDMIND

Pycno Agriculture

Lucid Networks Ltd

Luxe Smart Homes

Smart Home & Lighting Systems

SharpEnd

AVITHA

Ratio

ULTRA IoT

Mothive

Data City

ROLABOTIC

Internet of Trees

Ringtail Software

Wales Interactive Services

Kite Distribution

Dufrain

Metafused

We Talk IT

Precipice Design

Supercharge