Top 100 JavaScript Development Companies in London
The Best of April 2026Looking 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$50,000+10 - 49 employeesLondon, EnglandCustom software development firm Clock Limited was established in 1997. The agency offers Custom Software Development, Mobile App Development, UX/UI Design, and Web Development and has a small team. The agency is headquartered in Sarratt, England and London, England.Read More
Clients
Riot Games Mythical Society Hearst International Tennis FederationIndustries
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32$10,000+10 - 49 employeesLondon, EnglandRead More
Plug & Play is a UX/UI agency based in London and Surrey. Founded in 2007, they are specialists in user experience and user interface design for software, websites and custom applications. They also have a front-end development service to support clients with the design implementation. Plug & Play work across a number of sectors with their clients ranging from funded startups to large corporations such as Legal & General.
Clients
WWF Powerleague Give A Grad A Go RSL AwardsIndustries
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33$10,000+10 - 49 employeesLondon, EnglandFounded in 2018, Hiyield is a web design agency. Their small team is headquartered in London, England; Truro, England and Bristol, England. Their team offers Web Design, UX/UI Design, Custom Software Development, Web Development, and more.Read More
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34$10,000+50 - 249 employeesLondon, EnglandSnotor is a midsize app development firm. Established in 2007, the team provides Mobile App Development, Web Development, IT staff augmentation, Custom Software Development, and more. The firm is in Rīga, Latvia; London, England and Khmel'nyts'kyi, Ukraine.Read More
Clients
Defero Hypefill Wellics IsobioticsIndustries
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35$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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36$10,000+10 - 49 employeesLondon, EnglandLaunched in 2014, Softblues is a small AI firm. Their services include Artificial Intelligence, Generative AI, AI Consulting, Web Development, and more. The company is headquartered in London, England; Nordhalben, Germany; New York, New York and Toronto, Canada.Read More
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PinterestIndustries
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37$10,000+10 - 49 employeesLondon, EnglandRattlesnake Group, a branding company, was founded in 2020. The company specializes in Branding, UX/UI Design, Custom Software Development, Web Design, and more and has a small team.Read More
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38$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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39$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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40$10,000+10 - 49 employeesLondon, EnglandTLVTech, a web development company, is in Tel Aviv-Yafo, Israel; New York, New York and London, England. The firm specializes in Web Development, Mobile App Development, Artificial Intelligence, cloud consulting & SI, and more and has a small team.The firm was founded in 2017.Read More
Clients
Snyk Coretigo INX MetrofunIndustries
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41$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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42$25,000+50 - 249 employeesLondon, EnglandCimpleO Group is an IoT development company. Their midsize team is located in Hong Kong SAR, Hong Kong; Bangkok, Thailand and London, England. The firm focuses on IoT development, Custom Software Development, Web Development, Mobile App Development, and more.Read More
Clients
American Chemical SocietyIndustries
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43$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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44Undisclosed50 - 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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45$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.
Clients
High Touch Investment Corp Inc (USA) Assent Inc (Canada and USA) South Themes Colleges Group (UK) Airhosted (Switzerland)Industries
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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
Clients
Stanford University Microsoft Clair HenkelIndustries
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47$10,000+50 - 249 employeesLondon, EnglandSignifly 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
Clients
GoogleIndustries
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48$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.
Clients
HomeViewsIndustries
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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 employeesLondon, EnglandNimblechapps 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
Clients
Strom MotorsIndustries
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52$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
Clients
Oxford Medical SimulationIndustries
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53$5,000+10 - 49 employeesLondon, EnglandRepublic Marketing, a web design agency, was launched in 2020. Their small team is headquartered in Birmingham, England and London, England and provides Web Design, Search Engine Optimization, Web Development, and Pay Per Click.Read More
Clients
Josh Fano Pume Rove Legal PureBurnIndustries
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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+250 - 999 employeesLondon, EnglandBased in Dhaka, Bangladesh; London, England; Dubai, United Arab Emirates and Dhaka, Bangladesh, Riseup Labs is an UX company. They offer UX/UI Design, IT managed services, IT staff augmentation, Custom Software Development, and more and were established in 2010.Read More
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56$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.
Clients
WayfairIndustries
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57$1,000+10 - 49 employeesLondon, EnglandTakeaway Reality is an AR/VR development company. Their small team is in London, England and Zagreb, Croatia and provides AR/VR development, Custom Software Development, Business Consulting, Web Development, and more. The firm was founded in 2020.Read More
Clients
Microsoft FordIndustries
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58$50,000+10 - 49 employeesLondon, EnglandBoldheart, 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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59$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.
Clients
Tesco Burger King AS Watson Group PikmykidIndustries
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60$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.
Clients
Home Depot Meadowbrook Financial Mortgage Bankers Long Island University Student Nursing Association (SNA) CassoneIndustries
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