Top 100 JavaScript Development Companies in London
The Best of May 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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451$5,000+2 - 9 employeesLondon, EnglandARITOM TECHNOLOGIES LTD is a London, England-based artificial intelligence development company. Launched in 2026, the small team specializes in Artificial Intelligence, AI Agents, Social Media Marketing, Product Design, and more.Read More
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452$1,000+10 - 49 employeesLondon, EnglandRead More
W3 Lab Digital Solutions, a web development firm, was established in 2016. The firm specializes in web development, conversion optimization, pay per click, search engine optimization, and more and has a small team.
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453$1,000+2 - 9 employeesLondon, EnglandWeb design company DigiBulbo is based in London, United Kingdom. The small company was established in 2022. Their team provides web design, web development, mobile app development, and application management & support.Read More
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454$5,000+2 - 9 employeesLondon, EnglandPortox is an e-commerce development firm. Established in 2020, the team specializes in e-commerce development, digital strategy, web development, mobile app development, and more. Their small company is headquartered in Porto, Portugal; Madrid, Spain and Firenze, Italy.Read More
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Unicef United Nations Samsung Porto VentureIndustries
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455$5,000+50 - 249 employeesLondon, EnglandDigital Auxilio Technologies is a website development company. Launched in 2019, the team specializes in Web Development and Mobile App Development.Read More
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AppStoryorgIndustries
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456$1,000+10 - 49 employeesLondon, EnglandWebber 360º is a branding company in Budapest, Hungary and Wien, Austria. Their services include Branding and Market Research.Read More
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457$5,000+50 - 249 employeesLightwater, EnglandRead More
Ray Solutions Ltd is an IT staff augmentation company. They specialize in IT staff augmentation, custom software development, Artificial Intelligence, web development, and more and were established in 2012. Their midsize team is Lightwater, United Kingdom-based.
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Bright NetworkIndustries
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458$10,000+50 - 249 employeesLondon, EnglandSmall user experience agency Damex Digital, is located in Lake Kathyln, Bangladesh and Dhaka, Bangladesh. Established in 2020, the team provides ux/ui design, web design, print design, graphic design, and more.Read More
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IMCorp IncIndustries
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459Undisclosed10 - 49 employeesLondon, EnglandHexaexperts is a London, England-based software development firm. They offer Custom Software Development and Web Development and were launched in 2017.Read More
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460$1,000+Freelancer employeesLondon, EnglandITDWX Ltd. Is a website development company. Their small team is headquartered in London, England. Their services include Web Development and E-Commerce Development.Read More
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461$5,000+2 - 9 employeesLondon, EnglandFounded in 2018, Wish Software Studio LTD is a small mobile app development firm. Their services include Mobile App Development and Web Development.Read More
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462$1,000+Freelancer employeesLondon, EnglandWildPress is a website development firm launched in 2013. The team specializes in Web Development and Web Design and is based in London, England.Read More
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463$1,000+2 - 9 employeesHertford, EnglandVirtue Web Solutions is a website development company. They are in Hertford, England and have small team. They focus on Web Development and Web Design.Read More
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464$1,000+2 - 9 employeesLondon, EnglandPressific is an IT managed services company. The London, England-based firm was established in 2014. Their team specializes in IT managed services and Web Development.Read More
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465$1,000+2 - 9 employeesWare, EnglandRead More
Heavy Penguin is a digital web agency founded in 2010. Based in Ware, United Kingdom, the team specializes in web development, eCommerce development, and UX/UI design. They primarily serve clients in the eCommerce, government, and consumer products and services agencies. Heavy Penguin designed and developed a corporate website for a landscaping and building company, helping them showcase their work and attract clients. The team also implemented email and contact capabilities.
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ArgosIndustries
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466$50,000+250 - 999 employeesFarnborough, EnglandOne Beyond is an UX design company. Their midsize team is headquartered in Farnborough, England; Madrid, Spain; Budapest, Hungary and Szeged, Hungary. The firm focuses on UX/UI Design, IT strategy consulting, cloud consulting & SI, IT staff augmentation, and more.Read More
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Smith & NephewIndustries
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467$10,000+10 - 49 employeesLondon, EnglandRead More
In London, England and Odesa, Ukraine, Solar Digital is a website development firm. The firm specializes in Web Development, Web Design, UX/UI Design, Custom Software Development, and more and is small.The firm was founded in 2016.
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Stark Shipping (analytical portal of marine industryIndustries
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468$1,000+50 - 249 employeesWoking, EnglandImpressive Sol is a web design agency. Founded in 2013, their team offers Web Design and Graphic Design.Read More
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469Undisclosed50 - 249 employeesRichmond, EnglandGislen Software is a custom software development firm established in 1994. Their team specializes in Custom Software Development and Web Development.Read More
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470$1,000+Freelancer employeesLondon, EnglandM2Poweri Ltd, a website development company, is headquartered in London, England. The team offers Web Development and Search Engine Optimization.Read More
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471$1,000+50 - 249 employeesSlough, EnglandTechno Infonet is an ERP consulting and SI company founded in 2004. The agency provides ERP consulting and SI, Custom Software Development, Mobile App Development, E-Commerce Development, and more and has a midsize team.Read More
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Ahwar AppIndustries
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472$1,000+Freelancer employeesEpsom, EnglandWeb App Developer is a web design agency. Their small team is in Epsom, England. Their services include Web Design and Web Development.Read More
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473$1,000+10 - 49 employeesDartford, EnglandBranding firm Nestamedia Studios is located in Dartford, England. The team provides Branding and Marketing Strategy.Read More
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474$1,000+2 - 9 employeesLondon, EnglandFounded in 2026, NEPTUNE BLUE - TECHNOLOGY LTD is a mobile app development firm. The small team offers Mobile App Development and Custom Software Development.Read More
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475$5,000+2 - 9 employeesLondon, EnglandForci is a CRM consulting and SI company launched in 2009. The small team offers CRM consulting and SI and Web Development.Read More
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476$10,000+Freelancer employeesLondon, EnglandEpisty is an UX design company. The firm is in London, England. Their services include UX/UI Design and Mobile App Development.Read More
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477Undisclosed2 - 9 employeesLondon, EnglandClickaByte is a London, England-based software development firm. Launched in 2025, the team specializes in Custom Software Development and Web Development.Read More
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478$50,000+10 - 49 employeesASCOT, EnglandRawnet Ltd is a Digital Strategy company founded in 2002. Located in ASCOT, England, the team offers Digital Strategy and UX/UI Design.Read More
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479$1,000+2 - 9 employeesHarlow, EnglandRead More
Fintek Software is a Harlow, United Kingdom-based custom software development company. The small firm was founded in 2014. Their team provides custom software development, web development, mobile app development, and other application development.
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480$25,000+2 - 9 employeesLondon, EnglandRead More
We Are Outliers is a custom software development company. They specialize in custom software development, mobile app development, ux/ui design, web design, and more and were founded in 2021. The firm is based in London, United Kingdom.
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