Top 100 JavaScript Development Companies in the United Kingdom
The Best of February 2026Looking 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.
List of the Best United Kingdom JavaScript Developers
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1$10,000+250 - 999 employeesLondon, EnglandGeekyAnts is a Bengaluru, India-based custom software development firm. The midsize team provides Custom Software Development, Mobile App Development, Web Development, Artificial Intelligence, and more. The firm was launched in 2006.Read More
Clients
Siveco Romania Olive Garden Darden KhataBookIndustries
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2$50,000+50 - 249 employeesMatlock, EnglandWebsite development company Human Made was launched in 2010. The midsize New York, New York-based team focuses on Web Development.Read More
Clients
Sony Playstation Disney Standard Chartered HarvardIndustries
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3$25,000+1,000 - 9,999 employeesLondon, EnglandVention is a large software development firm founded in 2002. Their team specializes in Custom Software Development, IT staff augmentation, Web Development, Mobile App Development, and more. The company is based in New York, New York; London, England; Marietta, Georgia and San Francisco, California.Read More
Clients
IBM PayPal pwc IC MarketsIndustries
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4$25,000+50 - 249 employeesRickmansworth, EnglandLight IT Global is a website development company. The midsize Rickmansworth, England-based team specializes in Web Development, Custom Software Development, Mobile App Development, Artificial Intelligence, and more. The firm was launched in 2006.Read More
Clients
Pfizer Philips Healthcare Synthesis Health ABBIndustries
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5$10,000+10 - 49 employeesLondon, EnglandRead More
Marzee Labs is a web development company that has been offering web design, web development, ad e-commerce development services to their clients since 2013. Their 10 employees are based out of their Porto, Barcelona, London, and Setúbal, Portugal offices.
Clients
ARTEIndustries
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6$25,000+50 - 249 employeesLondon, EnglandRead More
Imaginary Cloud is a Web, Mobile and AI Software Development and UX/UI Design Company with offices in the UK, US and Portugal. In the last 11 years they have helped build and scale more than 300 applications, from Start-ups, Scale-ups to Enterprises, winning several global awards. They offer a comprehensive skill set of developers, data scientists and designers coupled with a streamlined agile process.
Clients
NokiaIndustries
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7$50,000+50 - 249 employeesBristol, EnglandRead More
Torchbox is a web design agency launched in 2000. The firm focuses on web design, web development, ux/ui design, pay per click, and more and has a midsize team.
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8$5,000+50 - 249 employeesLondon, EnglandDigis, a Fiverr company (NYSE: FVRR) is a custom software development company and web development firm. Launched in 2015, the team offers Custom Software Development and Web Development. Their midsize firm is in London, England; New York, New York; București, Romania and L'viv, Ukraine.Read More
Clients
Blablacar Hubspot PwC HumaIndustries
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9$50,000+250 - 999 employeesLjubljana, SloveniaSoftware development firm Infinum was founded in 2005. They are headquartered in New York, New York; San Francisco, California; Zagreb, Croatia and Ljubljana, Slovenia and have a midsize team. Infinum provides Custom Software Development, Web Development, Mobile App Development, UX/UI Design, and more.Read More
Clients
PhilipsIndustries
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10$50,000+50 - 249 employeesL'viv, UkraineRead More
Unicrew is a software development firm located in L'viv, Ukraine; Ormond Beach, Florida and London, England. The midsize company was founded in 2012. Their team focuses on Custom Software Development, Web Development, IT staff augmentation, and Mobile App Development.
Clients
Jack Cooper Transport Bigfood Group Booked It Open Room Inc.Industries
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11$5,000+250 - 999 employeesLondon, EnglandFounded in 2003, Konstant Infosolutions is a mobile app development company. They are in Jaipur, India; New York, New York; London, England and Dubai, United Arab Emirates and have a midsize team. Their services include Mobile App Development, Artificial Intelligence, UX/UI Design, and Web Development.Read More
Clients
United Nations Volkswagen Stanley Connect DelmonteIndustries
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12$10,000+50 - 249 employeesPraha, Czech RepublicValor Software is a Lakewood, Colorado-based web design company. The midsize company was established in 2013. Their services include Web Design, UX/UI Design, IT strategy consulting, IT staff augmentation, and more.Read More
Clients
BreetheIndustries
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13$10,000+50 - 249 employeesLondon, EnglandRead More
SovTech is a custom software development company based in Johannesburg with offices in London and Nairobi. Founded in 2012, they work with enterprise and midmarket businesses with a focus on clients in the financial services industry.
Clients
DiscoveryIndustries
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14$10,000+250 - 999 employeesLondon, EnglandWebskitters is a mobile app development company. Their midsize team is based in Kolkata, India; London, England; Miami, Florida and Claymont, Delaware and focuses on Mobile App Development, Web Development, E-Commerce Development, IoT development, and more. The agency was founded in 2010.Read More
Clients
Mercedes-AMGIndustries
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15$25,000+50 - 249 employeesLondon, EnglandRead More
Tech Alchemy is a software development studio based in London. Founded in 2016, they have around 150 employees who provide startups and small to medium-sized businesses with custom software development, blockchain development, and web & mobile app design and development. Services include prototyping, discovery, MVP development, and Web3 digital transformation
Clients
Ocean BottleIndustries
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16$10,000+50 - 249 employeesLondon, EnglandThoughtbot, a web development firm, is located in New York, New York and London, England. They focus on Web Development, Mobile App Development, UX/UI Design, cloud consulting & SI, and more and were launched in 2003.Read More
Clients
Health Match 360Industries
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17$10,000+10 - 49 employeesBromley, EnglandGoodface agency is a small UX design agency. They offer UX/UI Design, Custom Software Development, and Web Development and were established in 2016.Read More
Clients
Magnetiq Bank 365 Games Corefy KARL STORTZIndustries
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18$50,000+250 - 999 employeesLondon, EnglandRead More
Empat is an app development company established in 2013. They are in San Francisco, California; Kyiv, Ukraine; London, England and Miami, Florida and have a midsize team. Their services include Mobile App Development, Custom Software Development, and Web Development.
Clients
Obimy — A mobile app connecting loved ones across distances with over 10 million downloads on iOS and Android. Enables seamless communication and emotional connection. Mobile app development and social networking focus. Bigsister — Custom AI software designed for sales performance tracking and analysis, providing clean, accurate data to optimize sales teams and improve efficiency with advanced analytics. Trigga — A fintech project featuring payment systems and a comprehensive analytical database to support secure transactions and financial insights for smarter decision-making. DentalCare — Healthcare ecosystem with mobile app, web development, and CRM tools for managing patient records, tracking appointments, and sending automated reminders to improve patient care.Industries
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19$10,000+50 - 249 employeesLondon, EnglandRead More
Old.St Labs is a London, England-based custom software development firm. Founded in 2020, the midsize team specializes in Custom Software Development, Web Development, Mobile App Development, and Artificial Intelligence.
Clients
Mariana UFP The Military App Allegr Pixel ArtworksIndustries
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20$25,000+250 - 999 employeesGliwice, PolandLocated in Gliwice, Poland; Ternopil, Ukraine; London, England and Düsseldorf, Germany, Future Processing is a software development firm. The midsize agency was launched in 2000. Their services include Custom Software Development, cloud consulting & SI, BI & big data consulting & SI, Web Development, and more.Read More
Clients
AllocateIndustries
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21$25,000+50 - 249 employeesLondon, EnglandRead More
DotCode is a design and development company based in Lviv, Ukraine, and founded in 2018. Their team of more than 10 provides web development, web design, and e-commerce development solutions for clients in the fields of hospitality, advertising, and financial services.
Clients
Ply LCM Digital Fly Jets ThriveIndustries
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22$10,000+10 - 49 employeesLymm , EnglandVisions Design, a branding company, is in Lymm , England and Fort Worth, Texas. Launched in 2010, the small team offers Branding, Web Design, Web Development, and Search Engine Optimization.Read More
Clients
cocreatd Black X Unreasonable System 7Industries
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23$10,000+250 - 999 employeesLondon, EnglandSENLA is a midsize software development company. Located in Warszawa, Poland; London, England and Zagreb, Croatia, the agency was established in 2012. Their team focuses on Custom Software Development, Web Development, Mobile App Development, Blockchain, and more.Read More
Clients
Abbott BOSCH KPMG Western UnionIndustries
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24$1,000+2 - 9 employeesLondon, EnglandSmall SEO company Agile Digital Agency, is headquartered in London, England. They provide Search Engine Optimization, Web Design, and Web Development and were launched in 2018.Read More
Clients
Singleton Law Firm (USA)Industries
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25$75,000+50 - 249 employeesBoston, MARead More
Web development company 10up is headquartered in Sacramento, California; Boston, Massachusetts; New York, New York and London, United Kingdom. The agency provides web development, ux/ui design, web design, digital strategy, and more and is midsize.The agency was established in 2011.
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26$25,000+250 - 999 employeesChicago, ILTekRevol is a midsize application development company founded in 2018. Their team specializes in Mobile App Development, IT staff augmentation, Custom Software Development, Web Development, and more. The company is located in Houston, Texas; Red Deer, Canada; Newark, California and New York, New York.Read More
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27$10,000+250 - 999 employeesLondon, EnglandSoftware development company *instinctools was launched in 2000. Their midsize team is located in Stuttgart, Germany; Warszawa, Poland; Mississauga, Canada and Wilmington, Delaware and provides Custom Software Development, Web Development, IT strategy consulting, Mobile App Development, and more.Read More
Clients
Daimler Fujitsu Nostrum SpexAIIndustries
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28$5,000+50 - 249 employeesStamford, EnglandRead More
Offshorly, a custom software development firm, was launched in 2014. Their midsize team is based in Stamford, England and Quezon City, Philippines and provides Custom Software Development, Artificial Intelligence, Web Design, Web Development, and more.
Clients
7-11 (Philippines) Dribble Portfolio: https://dribbble.com/offshorlyIndustries
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29$75,000+250 - 999 employeesLincoln, EnglandCodal is a website development company. The midsize Chicago, Illinois-based team provides Web Development, UX/UI Design, and E-Commerce Development. The company was founded in 2009.Read More
Clients
Baxter Charles Schwab ExpressMed Cocktail CourierIndustries
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30$5,000+10 - 49 employeesLondon, EnglandRead More
Based in London, United Kingdom, Goodspeed is a website development firm. The small firm was founded in 2022. Their services include web development, custom software development, and mobile app development.
Industries
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