Top 100 JavaScript Development Companies in London
The Best of December 2025Looking for a top JavaScript developer in London?
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 London. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best London JavaScript Developers
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31$10,000+10 - 49 employeesLondon, EnglandHiyield is a web design company. They are located in London, England; Truro, England and Bristol, England and have a small team. Their services include Web Design, UX/UI Design, Custom Software Development, Web Development, and more. The agency was established in 2018.Read More
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32$10,000+10 - 49 employeesLondon, EnglandRead More
Rattlesnake Group is a web design company. Established in 2020, the team offers web design, marketing strategy, product design, branding, and more. Their small firm is London, United Kingdom-based.
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33$10,000+10 - 49 employeesLondon, EnglandRead More
CodeLeap is a London, United Kingdom-based application development firm. The small team specializes in mobile app development, web development, Artificial Intelligence, AR/VR development, and more. The company was founded in 2019.
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34$10,000+50 - 249 employeesLondon, EnglandInfluential Software is a London, England-based software development firm. The midsize team focuses on Custom Software Development, Web Development, BI & big data consulting & SI, IT managed services, and more and was founded in 1993.Read More
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DeloitteIndustries
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35$10,000+50 - 249 employeesL'viv, UkraineRead More
Founded in 2019, Uinno is an artificial intelligence firm. The midsize team specializes in Artificial Intelligence, Custom Software Development, Low/No Code Development, UX/UI Design, and more. The company is based in L'viv, Ukraine; Tallinn, Estonia; Kingston upon Thames, England and Zaporizhzhia, Ukraine.
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OnlyFansIndustries
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36$50,000+50 - 249 employeesLondon, EnglandRead More
ClerksWell is a custom software development firm. They are headquartered in London, United Kingdom and have a midsize team that focuses on custom software development, web development, IT strategy consulting, web design, and more. The firm was founded in 1996.
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37$5,000+10 - 49 employeesLondon, EnglandBranding company Burst Digital is in London, England; New York, New York and San Francisco, California. They specialize in Branding, Social Media Marketing, Search Engine Optimization, Web Design, and more and were founded in 2018.Read More
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Vivienne Westwood - The Vivienne Foundation Artisan AI Cogency Global Moonbeam Car WashIndustries
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38$10,000+10 - 49 employeesLondon, EnglandRead More
COMPU-VISION S.A.R.L. Is a website development firm headquartered in Batroun, Lebanon; Miami Beach, Florida and London, England. The agency specializes in Web Development, Mobile App Development, and Custom Software Development and has a small team.The agency was launched in 2010.
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Luxury Rentals Miami Beach Sleeping Plaza Masdar KSA Jetour QatarIndustries
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39$10,000+50 - 249 employeesLondon, EnglandRead More
Snotor is a web development firm. The midsize Rīga, Latvia-based firm was founded in 2007. Their services include Web Development, Mobile App Development, UX/UI Design, IT staff augmentation, and more.
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Defero Hypefill Wellics IsobioticsIndustries
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40$1,000+10 - 49 employeesBoston, MARead More
Seahawk Media is a web design and development company based in Boston, but with offices around the world. Founded in 2015, they also provide SEO, branding, and UX/UI design services. They're also a GoDaddy partner.
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41$10,000+10 - 49 employeesLondon, EnglandRead More
TLVTech is a website development company in Tel Aviv-Yafo, Israel; New York, New York and London, England. The small company was founded in 2017. Their services include Web Development, Mobile App Development, Artificial Intelligence, cloud consulting & SI, and more.
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Snyk Coretigo INX MetrofunIndustries
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42$25,000+2 - 9 employeesLondon, EnglandRead More
Launched in 2015, NerdCow is a small web design agency. Their team provides Web Design, Web Development, and Conversion Optimization. The agency is located in London, England.
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43$25,000+50 - 249 employeesLondon, EnglandIoT development company CimpleO Group was established in 2012. Their midsize team is based in Hong Kong SAR, Hong Kong; Bangkok, Thailand and London, England. CimpleO Group focuses on IoT development, Web Development, Web Design, Custom Software Development, and more.Read More
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American Chemical SocietyIndustries
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44$10,000+10 - 49 employeesLondon, EnglandRead More
Lightflows is a website development firm headquartered in Guildford, England and London, England. The small agency was established in 2009. Their services include Web Development, Mobile App Development, UX/UI Design, Custom Software Development, and more.
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HomeViewsIndustries
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45Undisclosed50 - 249 employeesLondon, EnglandRead More
Fourmeta is an e-commerce development firm founded in 2017. In London, United Kingdom, their midsize team offers e-commerce development, ux/ui design, and web development.
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46$10,000+10 - 49 employeesLondon, EnglandHue&machine is an user experience agency. The small London, England-based agency was founded in 2020. Their services include UX/UI Design, Custom Software Development, Web Design, Web Development, and more.Read More
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Stanford University Microsoft Clair HenkelIndustries
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47$10,000+50 - 249 employeesMontréal, CanadaSignifly is a branding company established in 2010. They are located in Montréal, Canada; København, Denmark; Oslo, Norway and Stockholm, Sweden and have a midsize team. The company specializes in Branding, E-Commerce Development, Marketing Strategy, Digital Strategy, and more.Read More
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GoogleIndustries
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48$25,000+10 - 49 employeesLondon, EnglandBit Zesty is a small Application Management & Support company. Based in London, England, the firm was founded in 2009. Their team focuses on Application Management & Support, Custom Software Development, E-Commerce Development, Web Development, and more.Read More
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Oxford Medical SimulationIndustries
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49$25,000+2 - 9 employeesLondon, EnglandRead More
Powered By Coffee is a London, United Kingdom-based website development firm. Launched in 2011, the small team focuses on web development, e-commerce development, web design, digital strategy, and more.
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Key MediaIndustries
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50$50,000+10 - 49 employeesLondon, EnglandRead More
NEVERBLAND is a web development firm. They provide web development, web design, ux/ui design, custom software development, and more and were launched in 2010. Their small team is London, United Kingdom-based.
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TogetherallIndustries
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51$10,000+50 - 249 employeesAhmedabad, IndiaNimblechapps Pvt. Ltd. Is a mobile app development company headquartered in Ahmedabad, India; Austin, Texas and London, England. They offer Mobile App Development and Web Development and were established in 2014.Read More
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Strom MotorsIndustries
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52$10,000+10 - 49 employeesLondon, EnglandRead More
ExpandX is a web development firm. Their small team is in Sofia, Bulgaria; London, England; München, Germany and New York, New York. The firm specializes in Web Development, Social Media Marketing, Pay Per Click, E-Commerce Development, and more. The firm was established in 2015.
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High Touch Investment Corp Inc (USA) Assent Inc (Canada and USA) South Themes Colleges Group (UK) Airhosted (Switzerland)Industries
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53$10,000+50 - 249 employeesLondon, EnglandRead More
Haefele Software is a midsize Cape Town, South Africa-based software development company. They focus on Custom Software Development, Enterprise App Modernization, Web Development, API Development, and more and were founded in 2006.
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Tesco Burger King AS Watson Group PikmykidIndustries
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54$25,000+10 - 49 employeeslondon, EnglandRead More
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.
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DoctorLinkIndustries
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55$5,000+50 - 249 employeesLondon, EnglandRead More
Protocloud Technologies PVT. LTD. is an information technology and services provider that was founded in 2011. Their headquarters are in Jaipur, India, where they employ between 10 and 15 staff. They work with a range of midmarket and small businesses, offering a full suite of digital solutions, including e-commerce development, custom software development, websites, mobile apps and cloud integration.
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WayfairIndustries
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56$5,000+10 - 49 employeesLondon, EnglandWeb design company Republic Marketing is in Birmingham, England and London, England. The small agency was established in 2020. Their team focuses on Web Design, Search Engine Optimization, Pay Per Click, and Web Development.Read More
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Josh Fano Pume Rove Legal PureBurnIndustries
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57$50,000+10 - 49 employeesBerlin, GermanyBoldheart, a mobile application development firm, was founded in 2020. The agency specializes in Mobile App Development, Custom Software Development, UX/UI Design, IT strategy consulting, and more and has a small team. The agency is in Berlin, Germany; München, Germany; Zürich, Switzerland and Wien, Austria.Read More
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ValoraIndustries
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58$10,000+10 - 49 employeesLondon, EnglandRead More
Top Notch Dezigns® is a small web design agency. Founded in 2004, the firm is headquartered in New York, New York; Melville, New York; Los Angeles, California and London, England. Their team specializes in Web Design, Search Engine Optimization, Pay Per Click, Web Development, and more.
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Home Depot Meadowbrook Financial Mortgage Bankers Long Island University Student Nursing Association (SNA) CassoneIndustries
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59$25,000+50 - 249 employeesCobham, EnglandMobcoder, an IT staff augmentation company, is located in Seattle, Washington; Cobham, England; Ghaziabad, India and Burnaby, Canada. The midsize company was launched in 2014. Their services include IT staff augmentation, Artificial Intelligence, UX/UI Design, BI & big data consulting & SI, and more.Read More
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General millsIndustries
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60$25,000+50 - 249 employeesAlexandria, VAPlavno, an app development firm, was established in 2007. The midsize team offers Mobile App Development, Artificial Intelligence, Custom Software Development, Web Development, and more. The company is headquartered in Alexandria, Virginia; Berlin, Germany; Calgary, Canada and London, England.Read More
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Mercedes, Xerox, Kia, eBay, PayPal, Amazon , IBM, Bank, MediacubeIndustries
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