Top 100 JavaScript Development Companies in the United Kingdom
August 2022Looking for a top JavaScript developer in the United Kingdom?
If you're hiring a JavaScript developer to help you build or update a website that's responsive and interactive, consider the pros and cons of JavaScript as a programming language. Advantages include its speed because it's executed on the client-side; reduction in server load; and diverse functionality. Disadvantages to consider include security such as bugs on the client-side.
To assist you in your search for a partner, we’ve compiled this list of the top JavaScript development agencies in United Kingdom. Browse descriptions, feedback, and awards to find which can best suit your company’s needs. If you need more support, tell us about your project, and we'll match you with recommended companies.
List of the Best United Kingdom JavaScript Developers
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1
- $10,000+
- 50 - 249 employees
- London, United Kingdom
Tech Alchemy was founded in 2016 and has two locations in London. Their team of nearly ten employees provides web development, mobile app development, and UX/UI design services for small businesses.
Clients
- Ocean Bottle
- TOAD
- MyBricks
- Moviecoin
Industries
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A children’s services platform hired TechAlchemy to develop a custom, private portal. The team built a functionality that connects child care service providers with suppliers of housing and bed space.
"TechAlchemy has the amazing ability to transform a crazy concept into reality."
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2
- $50,000+
- 250 - 999 employees
- London, United Kingdom
One Beyond is a bespoke software development company headquartered in Farnborough, England with additional engineering centers in London, Manchester, England, and Madrid, Spain. Across international locations, they have a team of more than 250 individuals providing custom software, mobile application, and web development services to a diverse clientele. They support established businesses, nonprofits, government organizations, and startups
Clients
- Mitsubishi
- Hospify
- Skanska
- Water Aid
Industries
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One Beyond (formerly DCSL GuideSmiths) developed a cloud-based web app for a contract company. The digital tool lets users define large construction projects and streamlines the procurement process for contractors.
“Whenever there was a problem, they helped us come up with a solution.”
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3
- $10,000+
- 10 - 49 employees
- London, United Kingdom
Hiyield is a small website development firm located in St. Austell, United Kingdom. Launched in 2018, the team focuses on web development, custom software development, ux/ui design, application management & support, and more.
Industries
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Hiyield developed a website for a climate change think tank. They also provided support during a company event, ensuring the website was compatible with the correct server and technology.
"Hiyield excellently developed and managed the site."
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4
- $10,000+
- 50 - 249 employees
- London, United Kingdom
Influential Software is a software development firm in London, United Kingdom; Maidstone, United Kingdom and Glasgow, United Kingdom. The firm focuses on custom software development, web development, BI & big data consulting & SI, IT managed services, and more and has a midsize team.The firm was launched in 1993.
Clients
- Deloitte
- American Express
- London Stock Exchange
- Pret a Manger
Industries
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Influential Software provided certified Apple and Microsoft training for an IT support company.
"They clearly understood our training requirements and were able to recommend the courses that we would need."
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5
- $10,000+
- 10 - 49 employees
- Edinburgh, United Kingdom
GearedApp is a software development firm based in Edinburgh, Scotland. They were founded in 2013 and have a team of 11 employees who specialize in mobile development, web development, and UX/UI design. They work mostly with small business clients in the healthcare, business services, and education industries.
Clients
- NHS
- Edinburgh University
- AWDis
- Raven Controls
Industries
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GearedApp was hired by a marketing agency to design and build a WordPress site for their not-for-profit campaign. They implemented a voting and nomination system into the site and handled its frontend design.
"Geared App was impressive in shortlisting the technology and plugins required to ensure a seamless project."
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6
- $5,000+
- 2 - 9 employees
- London, United Kingdom
Burst Digital is a web design company in London, United Kingdom. They offer web design, graphic design, web development, digital strategy, and more and were launched in 2018.
Clients
- Vivienne Westwood - The Vivienne Foundation
- Lucinda Green
- Clean Kitchen
- Verity Bowditch
Industries
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Burst Digital was hired by a financial management company for their web development and branding services. The team's other tasks include ongoing maintenance and content creation.
"Burst Digital helped us establish our branding and visibility."
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7
- $25,000+
- 10 - 49 employees
- london, United Kingdom
Thought&Function is a digital agency founded in London in 2017 with no more than 10 members. They are experts in web development, mobile app development, and UX/UI design solutions for clients in the industries of financial services, education, and health care.
Clients
- DoctorLink
- AllPlants
- ProperCorn
- Kano
Industries
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Thought&Function provides development services for a digital health company. They work on a mobile app’s frontend using React Native and the backend using AWS. Currently, they also work on a web application.
“Thoughts&Function’s team delivers everything we need.”
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8
- $5,000+
- 10 - 49 employees
- London, United Kingdom
Old.St Labs is a software development business based in London. The business, founded in 2020, has a team of more than ten that provides custom software development, mobile app development, UX/UI design, web design & development, and AI services. Old.St Labs serves small and mid-market companies in the advertising & marketing, education, financial services, health care & medical, and legal industries.
Clients
- Kopona
- Brain.Health
- CityMunch
- Altus Investment Management Ltd
Industries
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Old.St Labs added a page on a branding agency’s website. They first met with the client to discuss the specifications. They then created mockups and implemented those on Netlify and Prismic.
"They were flexible and professional, giving us advice on how we could efficiently manage our site in the future."
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9
- $25,000+
- 10 - 49 employees
- London, United Kingdom
Founded in 2018, Together is a creative agency. Their team of around 10 employees is based in London. They focus on web development and design and branding.
Clients
- Mosaic
- SeedLegals
- Amazon
- Coast
Industries
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Together helped a fintech company design and develop their brand guidelines and website to showcase their products and value proposition. The deliverables also included a new color palette and visual assets.
“They understood how to position our products as our brand's first and foremost important part.”
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10
- $25,000+
- 10 - 49 employees
- Sarratt, United Kingdom
Clock Limited is a digital design and build company. Founded in 1997, the company is headquartered in Kings Langley, United Kingdom. They have a team of around 35 employees who focus on custom software, web, and mobile app development.
Clients
- International Tennis Federation
- Leicester Tigers
- Northampton Saints
- Wall Street Journal
Industries
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Clock Limited is providing staff augmentation services to an e-commerce startup, ensuring that the client is able to deliver mission-critical systems. Their tech stack includes Node.js, MongoDB, and Python.
"Every Clock Limited team member I’ve interacted with is constructive, open, and caring."
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11
- $25,000+
- 50 - 249 employees
- Manchester, United Kingdom
Digiryte is a web and mobile app development company based in Manchester, United Kingdom with another UK office in Preston. Since 2015, their team of 28 has been specializing in mobile app development, custom software development, and web development for midmarket clients.
Clients
- NHS
- Channel 4
- Close Brothers
- Hinch Property Management
Industries
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Digiryte built a software solution for a software company. The goal was to develop a new business and to launch a platform for a unique market.
"They are all very welcoming, friendly, and knowledgeable."
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12
- $100,000+
- 50 - 249 employees
- Edinburgh, United Kingdom
xDesign is a design and development company in Edinburgh, U.K. Founded in 2010, their team of 50+ provides web development and mobile app development services to small business, midmarket, and enterprise clients across various industries.
Clients
- PayPal
- Heineken
- World Health Organization
- William Grant & Sons
Industries
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xDesign developed to help a modular building manufacturer better monitor its product delivery. The client mapped out its goals, from which they designed wireframes, prototyped, and ultimately delivered the app. The client was impressed with their ability to understand the project goals and provide input to improve the product.
"They picked up our business process very very quickly and they were very good at pointing out things they thought might be better." – IT & Digital Manager, Modular Building Manufacturer
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13
- $25,000+
- 10 - 49 employees
- London, United Kingdom
Bit Zesty is a custom software development firm. They provide custom software development, ux/ui design, web development, application management & support, and more and were launched in 2009. Their small team is London, United Kingdom-based.
Clients
- Oxford Medical Simulation
- Trussell Trust (UK Foodbanks)
- Queen's Awards for Enterprise
- HMRC
Industries
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Bit Zesty upgraded and rewrote two existing apps for a health and safety software company. They developed upgrades for APIs, added new functionality, and more.
"For any urgent issues we were able to contact them quickly."
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14
- $25,000+
- 10 - 49 employees
- Cambridge, United Kingdom
Custom software development firm Studio 24 is located in Cambridge, United Kingdom. The small company was founded in 1999. Their team focuses on custom software development, digital strategy, marketing strategy, web design, and more.
Industries
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Studio 24 was hired by an international standards organization for website design services. They had a discovery phase that took several months, then they proposed a new information architecture for the client.
"The absolute commitment of the studio's staff is impressive."
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15
- $10,000+
- 10 - 49 employees
- Dundee, United Kingdom
Zudu is a digital agency founded in 2014. Based in Dundee, U.K., they have two other offices in Edinburgh, U.K. and London. The team of 9 specializes in web development and mobile app development. The firm usually services midmarket and enterprise clientele.
Clients
- NHS
- Scottish Government
- SSSC
- Trading Standards
Industries
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Zudu provides web and mobile app design and development services for a volunteer engagement startup. They’ve redesigned the web-based application and built the mobile app focusing on UX.
“Zudu understands who the user is and why they’d be motivated to use our app.”
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16
- $25,000+
- 10 - 49 employees
- London, United Kingdom
Core Blue Ltd is a software engineering company based in London with an office in Plymouth, U.K. The company, founded in 2015, has a team of less than ten that provides custom software development, mobile app development, web development, and IoT development services to various companies.
Clients
- Bank of Kigali
- Kuoni
- SAP
- PayPoint
Industries
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A corporate finance company needed a software development partner to help support their clients. They chose to partner with Core Blue because of how they approach a project like this.
"They are always friendly and try their best to deliver the best product they can."
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17
- $50,000+
- 50 - 249 employees
- Hertford, United Kingdom
Zoocha is a web development firm founded in 2009 and headquartered in Hertford, in the U.K. The firm has other locations in Valencia, Spain; Balneário Camboriú, Brazil; and New York, N.Y. Zoocha has about 30 employees.
Clients
- Westminster City Council
- Financial Conduct Authority
- Ofsted
- Topdeck Travel (part of Flight Centre Travel Group)
Industries
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Zoocha created a web application for a UK oil and gas energy network. Using Drupal extensions and PHP scripting, Zoocha made an interactive platform for tracking and storing information. The client was impressed with Zoocha's work.
"The refresh that we did with Zoocha Ltd has increased business value by three times, and in some areas, it’s about six times. We haven’t had any bugs or crashes." - CEO, UK Energy Service Firm
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18
- $10,000+
- 2 - 9 employees
- London, United Kingdom
Founded in 2017, Lambert Labs is a software development agency that specializes in Python. Their team of fewer than 10 employees is based in London. They also provide web development services and application testing.
Clients
- Accenture
- Aerial Empire
- Bongo's Bingo
- Boost
Industries
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Lambert Labs has been hired by a cross-cultural consultancy to build a custom project management system. They have also resolved issues that were not addressed by the previous developers of a legacy software.
"They are easy communicators and professionals."
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19
- $10,000+
- 2 - 9 employees
- London, United Kingdom
Browser London is a digital product agency based in London, United Kingdom. This company has 11 employees and was founded in 2008. Services offered by Browser London include UI/UX design, web design, and custom software development for companies of all sizes.
Clients
- Mayor of London
- Lightning API
- Shell
- NHS
Industries
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Browser London created a simple software platform for a supply chain transparency firm. The client worked with a UI/UX specialist and a senior web developer to build the prototype.
"They were highly involved and engaging. We also came up with some good ideas for how to present information together."
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20
- $25,000+
- 50 - 249 employees
- Cardiff, United Kingdom
Box UK is an enterprise software development company based in Cardiff, UK, with an office in London. The company, founded in 1998, has more than 50 employees who provide, among others, custom software development, web development, and enterprise app modernization services to various businesses.
Clients
- OKdo.com
- Investec Asset Management
- ateb
- Welsh Government
Industries
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Box UK was hired by an Employee Benefits Service to oversee and advise on the Service's new e-commerce platform. But their service was expanded to include the development of the platform, rewriting some parts in Symfony from the original CakePHP. The client was so satisfied with the work that Box UK is still onboard to supply new features on the platform as needed.
"Box UK has a very modern, agile approach and is good at looking at new methods of working." - Project Manager, Employee Benefits Service
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21
- $50,000+
- 10 - 49 employees
- Manchester, United Kingdom
Founded in 2010, Silverchip is located in Manchester, United Kingdom. Their team of 13 employees provides mobile app development and custom software development services for enterprise, midmarket, and small businesses.
Clients
- Suits Me Banking
- England Squash
- LGBT Foundation
- Boundary Outlet
Industries
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Silverchip developed a documentation system to make it quicker and more customizable. They built out the database architecture and added a template builder. They developed with React, JavaScript, and C++.
“They enjoy what they do, and it shows in what they deliver to their clients.”
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22
- $10,000+
- 10 - 49 employees
- London, United Kingdom
Catch is a digital experience agency founded in 2007. Based in London, United Kingdom, they also have an office in Madrid, Spain, and a team of over 30 employees. They specialize in web development, UX/UI design, and content marketing.
Clients
- Sharp
- Tony Blair Institute
- Worldpay
- The Body Shop
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Catch refurbished the website of an investment management company to improve their online presence. They've used Figma to rebuild the UX, upgraded the system to Drupal 9, and hosted the site via Acquia and AWS.
"We’re most impressed with their team’s adaptability — they work within our schedules and stick to our project scope."
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23
- $10,000+
- 10 - 49 employees
- London, United Kingdom
We Are Kitty is a small London, United Kingdom-based user experience design company. Founded in 2017, the team provides ux/ui design, e-commerce development, web design, web development, and more.
Industries
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An online casino wanted to rebrand their business to align more as an entertainment brand. They hired We Are Kitty to create content, drive traffic to a new website, and engage with a new audience.
"They are a young and dynamic that's friendly and committed."
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24
- $25,000+
- 10 - 49 employees
- London, United Kingdom
Purr Digital is a software development agency that has been offering web development, mobile app development, and custom software development to their small business and mid-market clients in the hospitality, arts and entertainment, and consumer products and services industries since 2013. Their 50 employees are based out of their London and Birmingham, UK offices.
Clients
- Elder
- Loyalty Lion
- Unicef
- MCFC
Industries
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Purr Digital provided custom software development services for a creative and design agency. Their team handled frontend development of a web solution utilizing Laravel and React.
“They’re very collaborative. Purr Digital was open to feedback.”
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25
- $50,000+
- 2 - 9 employees
- London, United Kingdom
Digiruu is a digital firm founded in 2016 run by a team of fewer than 10 professionals. Based in London, the company lends their expertise in mobile app development, UX/UI design, and web design to clients ranging from startups to large enterprises, working in various industries such as consumer products, advertising, and media.
Clients
- Pretty Lavish
- ByErim
- The Climate Week NYC
- Subconsciously
Industries
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Digiruu provided mobile app development services for a hypnotherapy business. They developed a bespoke hypnosis application from the ground up. The main technology used was React Native.
"We were impressed with their friendliness and communication."
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26
- $25,000+
- 10 - 49 employees
- Cardiff, United Kingdom
Illustrate Digital is a web design and development agency that specializes in WordPress. Founded in 2013, they have a team of 10 between offices in Cardiff and Bristol, United Kingdom. They primarily work with midmarket clients across various industries.
Clients
- Penguin Random House
- Honda Motorcycles
- Admiral
- Welsh Government
Industries
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Illustrate Digital has overhauled a website for a digital identity verification company. The team has also provided UX/UI design and QA services.
"The workflow between our teams is seamless."
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27
- $50,000+
- 10 - 49 employees
- Sheffield, United Kingdom
The Curve, a software development firm, is in Sheffield, United Kingdom. They specialize in custom software development, web development, and mobile app development and were founded in 2019.Industries
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The Curve developed a custom solution for an e-learning company. The team managed both the back- and frontend using JavaScript technology, building the database, admin, and subscription sections.
"Their flexibility, efficiency, and professionalism were impressive."
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28
- $10,000+
- 50 - 249 employees
- Manchester, United Kingdom
CTI Digital is a full-service digital agency from Manchester, UK with other offices in London and Stockport, UK. The agency was established in 2003 and now has a team of 68 that works on web development, e-commerce development, mobile app development, and UX/UI design.
Clients
- Greater London Authority
- Merlin Entertainments
- Little Greene Paint
- Body Building Warehouse
Industries
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A government contractor previously had a website that was managed by one company and whose servers were hosted by another. They chose to consolidate all their website work at CTI Digital, who now hosts their servers, provides Drupal development, and updates the website and CRM.
"The support is really great. The team that deals with support is absolutely brilliant...We have a very good two-way working relationship." — Project Manager, Government Contractor
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29
- $50,000+
- 50 - 249 employees
- Sutton, United Kingdom
Geeks is a software development company in London. Founded in 2007, Geeks' team of 85 specializes in custom software development, web development, and mobile app development, primarily for midmarket clients in media and govenment.
Clients
- BBC
- EasyJet
- Euromoney
- Mitie
Industries
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A real estate brokerage hired Geeks Ltd for custom software development services. The team handled the client's intranet support services, CRM, document processing, and mobile optimization.
"We were impressed by their knowledge, communication style, and professionalism."
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30
- $10,000+
- 2 - 9 employees
- Bristol, United Kingdom
Noughts & Ones is a Squarespace and Shopify agency based in Bristol, United Kingdom. Founded in 2017, this company has three employees. Services provided by Noughts & Ones include web design, web development, and e-commerce development for small and midmarket companies.
Clients
- Dryrobe
- MrPresident
- Bone Idol
Industries
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A smartwatch straps manufacturer hired Noughts & Ones to create a website on Shopify. The team is helping the client creatively and strategically differentiate themselves from other brands through this effort.
"Noughts & Ones’ commitment to our business stands out."
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