Top 20 JavaScript Development Companies in Wales
The Best of December 2025Looking for a top JavaScript developer in Wales?
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 Wales. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best Wales JavaScript Developers
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1$25,000+50 - 249 employeesCardiff, WalesRead More
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.
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OKdo.comIndustries
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2$25,000+10 - 49 employeesCardiff, WalesIllustrate Digital, a small website development firm, is in Cardiff, Wales and Bristol, England. Launched in 2013, the team specializes in Web Development, UX/UI Design, and Web Design.Read More
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Penguin Random HouseIndustries
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3$1,000+10 - 49 employeesSwansea, WalesLaunched in 2010, The Constant Media is a web design agency. The small team specializes in Web Design, UX/UI Design, Web Development, and E-Commerce Development. The agency is based in Swansea, Wales.Read More
Clients
William Grants & Sons Van Cleef & Arpels Glenfiddich Whisky Asahi -
4$5,000+2 - 9 employeesCardiff, WalesRead More
CarbonCode Solutions Ltd, a custom software development company, was established in 2020. Based in Caerphilly, United Kingdom, their small team provides custom software development, web development, mobile app development, and other application development.
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5$10,000+10 - 49 employeesCardiff , WalesCREO, a small branding company, is in Cardiff , Wales. The team specializes in Branding and Digital Strategy.Read More
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6$1,000+10 - 49 employeesSwansea, WalesRead More
GR Digital is a Swansea, U.K. based digital agency that was founded in 2016. Their team of two offers clients PPC, SEO, and video production services. They mostly work with small businesses in the gambling, gaming, and media industries.
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Born SocialIndustries
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7$10,000+10 - 49 employeesCardiff, WalesIn Cardiff, Wales and Bristol, England, Sugar Creative is an AR/VR development company. They focus on AR/VR development and Mobile App Development.Read More
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8$5,000+2 - 9 employeesCardiff, WalesOdyssey is a Digital Strategy company. Founded in 2018, the team focuses on Digital Strategy and Web Development.Read More
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9Undisclosed2 - 9 employeesSaint Mellons, WalesButternut Web, a web design agency, was launched in 2021. The small team specializes in Web Design and Web Development.Read More
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10$10,000+10 - 49 employeesCardiff, WalesCardiff App Developers is a Cardiff, Wales-based mobile application development firm. The team specializes in Mobile App Development and Web Development.Read More
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11$10,000+10 - 49 employeesCardiff, WalesRead More
DabApps is a web and mobile application development agency based in Brighton, England. They were founded in 2010 and have a staff of 21 employees. They specialize in custom software, web, and mobile app development for primarily small business clients in the business services, consumer products, and education industries.
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LODIndustries
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12$5,000+50 - 249 employeesPontprennau, WalesDEVHOUSE TECHNOLOGIES LTD is a website development firm. They are based in Pontprennau, Wales and Roma, Italy, and their services include Web Development and Mobile App Development.Read More
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13Undisclosed2 - 9 employeesCardiff Bay, WalesWeb design company Eazyweb Internet Services was launched in 1996. In Cardiff Bay, Wales, the team offers Web Design and Web Development.Read More
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14$1,000+2 - 9 employeesMaesteg, WalesValley Web Designs is a SEO company. Launched in 2015, the team specializes in Search Engine Optimization and Web Design.Read More
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15$5,000+250 - 999 employeesCardiff, WalesIT staff augmentation company DigiMantra was founded in 2012. Their midsize team is headquartered in Sahibzada Ajit Singh Nagar, India; Dover, Delaware; Cardiff, Wales and Dubai, United Arab Emirates. DigiMantra focuses on IT staff augmentation, Mobile App Development, E-Commerce Development, Social Media Marketing, and more.Read More
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