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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91$10,000+10 - 49 employeesLondon, EnglandRead More
5StarDesigners is a design agency founded in London in 2013 with more than 10 members. They are experts in UX/UI design, mobile app development, and custom software development solutions for small and medium-sized companies.
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SwikeIndustries
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92$5,000+10 - 49 employeesLondon, EnglandRead More
RCCO - Creative Sales & Marketing, an user experience design agency, is located in London, United Kingdom. Launched in 2018, the small team specializes in ux/ui design, branding, digital strategy, and web design.
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93Undisclosed10 - 49 employeesLondon, EnglandRead More
Tilde Loop is a small software development firm launched in 2019. Their team specializes in custom software development, web development, and other application development. The firm is headquartered in London, United Kingdom.
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The LowdownIndustries
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94$25,000+10 - 49 employeesLondon, EnglandRead More
Yalla is an UX design company. They are in London, United Kingdom and Gaza City, Palestine, State of and have a small team that specializes in ux/ui design, custom software development, web design, web development, and more. The agency was launched in 2019.
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Shannon TrustIndustries
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95$25,000+10 - 49 employeesLondon , EnglandRead More
AVAMAE is a software solutions agency run by a team of fewer than 50 professionals founded in 2011. Based in London, the company offers custom software, web, and mobile app development services for small and medium-sized businesses from various industries, such as business services, financial services, and health care.
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BetDSIIndustries
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96$10,000+2 - 9 employeesLondon, EnglandRead More
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.
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AccentureIndustries
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97$5,000+10 - 49 employeesLondon, EnglandButtercups is a custom software development company and web development firm. The Kyiv, Ukraine-based firm was established in 2019. The small team offers custom software development and web development.Read More
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MobiWalletIndustries
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98$10,000+10 - 49 employeesLondon, EnglandIT Dev Staff is a software development firm. They focus on Custom Software Development, Web Development, Mobile App Development, E-Commerce Development, and more and were launched in 2016. The agency is headquartered in London, England.Read More
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99$25,000+10 - 49 employeesLondon, EnglandRead More
Umber.Tech — Fintech & Highload Experts is a Microservices Architecture Services company. Their small team is located in Tallinn, Estonia; Dubai, United Arab Emirates; Hannover, Germany and Boston, Massachusetts and offers Microservices Architecture Services, Web Development, Mobile App Development, UX/UI Design, and more. The agency was founded in 2017.
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Benzinga OLX AmeriaIndustries
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100$5,000+50 - 249 employeesLondon, EnglandRead More
Web design company Brander Studio is located in Kharkiv, Ukraine. The midsize agency was founded in 2009. Their team provides web design, mobile app development, web development, and digital strategy.
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UK Planet ToolsIndustries
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101$25,000+10 - 49 employeesLondon, EnglandAtraX is a small IT strategy consulting company. The Tirana, Albania-based company was established in 2015. Their services include IT strategy consulting, IT staff augmentation, Custom Software Development, Web Development, and more.Read More
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102$25,000+10 - 49 employeesLondon, EnglandIn London, England, Contic is an application development firm. They provide Mobile App Development, Web Development, Artificial Intelligence, UX/UI Design, and more and were founded in 2021.Read More
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103$25,000+10 - 49 employeesLondon, EnglandRead More
Theodo UK, founded in 2015, is a consultancy and digital development agency headquartered in London with an additional location in Paris. With a team of over 30 employees, they mainly provide mobile app development, web development, and custom software development services.
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AdmiralIndustries
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104$25,000+10 - 49 employeesWatford, EnglandRead More
AppDrawn is a software solutions company founded in 1999. Their headquarters are in London and they have a second office in Barcelona. Across these 2 locations, they have a team of a dozen staff that do custom software development, web development, and mobile app development for small and medium-size businesses.
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AspireIndustries
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105$5,000+10 - 49 employeesLondon, EnglandRead More
NU Creative is a London, United Kingdom-based branding company. They offer branding, email marketing, advertising, graphic design, and more and were launched in 2004.
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106$10,000+10 - 49 employeesLondon, EnglandRead More
Founded in 2009, Trembit is a full-service software development company based in Kiev. The team of 35+ provides custom software development, e-commerce development, web development, and mobile app development for mainly small businesses.
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Red5Pro.comIndustries
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107$25,000+50 - 249 employeesLondon, EnglandRead More
Located in London, England, Pocket App is a mobile app development company. Established in 2010, the midsize team offers Mobile App Development, UX/UI Design, and Web Development.
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108$5,000+10 - 49 employeesLondon, EnglandEstablished in 2013, Diversido is an app development company. Their small team is in Claymont, Delaware and London, England and focuses on Mobile App Development, Web Development, and IoT development.Read More
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eTutorCloudIndustries
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109$25,000+50 - 249 employeesLondon, EnglandWaracle, a software development firm, was established in 2004. Their midsize team is based in London, England; Dundee, Scotland; Edinburgh, Scotland and Glasgow, Scotland and provides Custom Software Development, Mobile App Development, Artificial Intelligence, Web Development, and more.Read More
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Virgin MoneyIndustries
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110$100,000+10 - 49 employeesLondon, EnglandRead More
Future Platforms is a London based digital agency. Founded in 2000, Future Platforms employs a team of 39 specialists that provide e-commerce, mobile app, and wearable app development.
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Domino’s PizzaIndustries
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111$10,000+10 - 49 employeesLondon , EnglandFounded in 2006, Design Culture is a web design company. Their small team is in London , England. Their team provides Web Design, Web Development, E-Commerce Development, Branding, and more.Read More
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112$5,000+10 - 49 employeesLondon, EnglandEpigra is a website development company. They are based in London, England and Istanbul, Türkiye and have a small team that offers Web Development, Web Design, UX/UI Design, Custom Software Development, and more. The agency was established in 2009.Read More
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Gulf InsuranceIndustries
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113$1,000+10 - 49 employeesLondon, EnglandRead More
Looming Tech, an app development company, is located in Sofia, Bulgaria and London, United Kingdom. The agency offers mobile app development, web development, custom software development, e-commerce development, and more and has a small team.The agency was founded in 2020.
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Lyst (http://lyst.co.uk/) Which (http://which.co.uk/) Imray Laurie Norie & Wilson (http://imray.com/) Hintsa (https://www.hintsa.com/)Industries
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114$10,000+10 - 49 employeesLondon, EnglandApplication development firm Redbee Software was founded in 2018. Their small team is located in Cluj-Napoca, Romania; New York, New York and London, England and specializes in Mobile App Development, Web Development, and UX/UI Design.Read More
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115$10,000+10 - 49 employeesLondon, EnglandRead More
ICustomWeb is a website development firm founded in 2018. The company offers web development, web design, and ux/ui design and has a small team. The company is located in Bournemouth, United Kingdom.
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116$10,000+10 - 49 employeesLondon, EnglandLaunched in 2007, SOTechnology is an AI Agents company. Their small team is based in London, England and Lafayette Hill, Pennsylvania. Their services include AI Agents, Artificial Intelligence, Custom Software Development, Digital Strategy, and more.Read More
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bakerdaysIndustries
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117$25,000+10 - 49 employeesLondon, EnglandFounded in 2019, Drewl is a small UX design company. Their team specializes in UX/UI Design, Web Development, and Web Design. The firm is in London, England.Read More
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118$25,000+10 - 49 employeesLondon, EnglandBlott is an AI development company established in 2019. Their small team is located in London, England and Colombo, Sri Lanka. The firm focuses on Artificial Intelligence, UX/UI Design, Web Development, Mobile App Development, and more.Read More
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119$10,000+10 - 49 employeesLondon, EnglandHeadChannel Consulting, a software development company, is based in London, England; Katowice, Poland and New York, New York. The small team provides Custom Software Development, Artificial Intelligence, UX/UI Design, Web Development, and more and was founded in 2004.Read More
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The William Pears GroupIndustries
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120$10,000+10 - 49 employeesLondon, EnglandApplication development company Foresight Mobile is based in Manchester, England; Birmingham, England and London, England. They offer Mobile App Development, Custom Software Development, Web Development, and API Development and were launched in 2016.Read More
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Table.co Swrve Levi Strauss EAIndustries
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