Top 100 JavaScript Development Companies in London
The Best of November 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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1$50,000+1,000 - 9,999 employeesLondon, EnglandVention is an artificial intelligence firm. Founded in 2002, the company is based in New York, New York; London, England; Marietta, Georgia and San Francisco, California. The large team focuses on Artificial Intelligence, Custom Software Development, Enterprise App Modernization, cloud consulting & SI, and more.Read More
Clients
IBM PayPal pwc IC MarketsIndustries
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2$10,000+250 - 999 employeesLondon, EnglandGeekyAnts is an application development firm established in 2006. The firm provides Mobile App Development, Custom Software Development, Artificial Intelligence, Web Development, and more and has a midsize team.Read More
Clients
Siveco Romania Olive Garden Darden KhataBookIndustries
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3$10,000+10 - 49 employeesLondon, EnglandCreativeWeb is a London, England-based web design company. The firm provides Web Design, Web Development, Search Engine Optimization, and E-Commerce Development and is small.The firm was founded in 2013.Read More
Clients
Gorilla Science The Tunnels - Gibraltar's WWII Experience Soapbox NATO Innovation FundIndustries
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4$50,000+250 - 999 employeesLondon, EnglandInfinum, a custom software development company, was established in 2005. They are in New York, New York; San Francisco, California; Zagreb, Croatia and Ljubljana, Slovenia and have a midsize team. Their services include Custom Software Development, Web Development, Mobile App Development, UX/UI Design, and more.Read More
Clients
PhilipsIndustries
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5$10,000+50 - 249 employeesLondon, EnglandWebsite development firm FocusReactive was launched in 2019. Located in Amsterdam, Netherlands; London, England; Warszawa, Poland and New York, New York, their midsize team provides Web Development, Custom Software Development, Web Design, and E-Commerce Development.Read More
Clients
EasyPark Arrive RealThreadIndustries
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6$10,000+10 - 49 employeesBromley, EnglandCustom software development firm Goodface agency was established in 2016. The firm offers Custom Software Development, UX/UI Design, Web Design, Web Development, and more and has a small team. The firm is based in Bromley, England; Kyiv, Ukraine; Tallinn, Estonia and New York, New York.Read More
Clients
Magnetiq Bank 365 Games Corefy KARL STORTZIndustries
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7$25,000+50 - 249 employeesLondon, EnglandUnicrew, a custom software development firm, was established in 2012. The firm focuses on Custom Software Development, Web Development, Enterprise App Modernization, Artificial Intelligence, and more and has a midsize team.Read More
Clients
Jack Cooper Transport Bigfood Group Booked It Open Room Inc.Industries
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8$10,000+50 - 249 employeesLondon, EnglandValor Software is a midsize website development firm headquartered in Lakewood, Colorado; Dover, Delaware; Praha, Czech Republic and London, England. Established in 2013, the team offers Web Development, IT staff augmentation, IT strategy consulting, Enterprise App Modernization, and more.Read More
Clients
BreetheIndustries
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9$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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10$5,000+50 - 249 employeesLondon, EnglandUPQODE is a web design agency. The midsize Nashville, Tennessee-based team focuses on Web Design, UX/UI Design, and Web Development. The agency was founded in 2015.Read More
Clients
Gracenote - Entertainment ProvidersIndustries
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11$25,000+250 - 999 employeesLondon, EnglandTekRevol is an application development firm launched in 2018. The firm offers Mobile App Development, IT staff augmentation, Custom Software Development, Web Development, and more and has a midsize team. The firm is based in Houston, Texas; Red Deer, Canada; Newark, California and New York, New York.Read More
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12$25,000+250 - 999 employeesLondon, EnglandEstablished in 2000, Future Processing is a custom software development company. The midsize team provides Custom Software Development, cloud consulting & SI, AI Consulting, Artificial Intelligence, and more. The agency is based in Gliwice, Poland; Ternopil, Ukraine; London, England and Düsseldorf, Germany.Read More
Clients
AllocateIndustries
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13$10,000+10 - 49 employeesLondon, EnglandFounded in 2016, Solar Digital is a website development company. The company specializes in Web Development, AI Agents, Custom Software Development, UX/UI Design, and more and has a small team. The company is headquartered in London, England and Odesa, Ukraine.Read More
Clients
Stark Shipping (analytical portal of marine industryIndustries
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14$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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15$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.
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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+50 - 249 employeesLondon, EnglandHeadquartered in London, England; Randburg, South Africa; Cape Town, South Africa and Nairobi, Kenya, Scrums.com is a website development company. The midsize team offers Web Development, Mobile App Development, Custom Software Development, and cloud consulting & SI. The firm was established in 2012.Read More
Clients
DiscoveryIndustries
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18$10,000+50 - 249 employeesLondon, EnglandCustom software development firm Brocoders was founded in 2014. The company provides Custom Software Development, Artificial Intelligence, cloud consulting & SI, Web Development, and more and has a midsize team.Read More
Clients
iFit - Interactive Fitness & Workout App HeyPractice, an AI-based Learning Platform MoolaX, Smart Cashflow Management Solution Every Pig, Online Logistics Platform for Swine Production IndustryIndustries
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19$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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20$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.
Clients
TogetherallIndustries
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21$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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22$25,000+50 - 249 employeesRickmansworth, EnglandLight IT Global is a web development company headquartered in Rickmansworth, England; Kyiv, Ukraine; Odesa, Ukraine and San Jose, California. The agency focuses on Web Development, Custom Software Development, IT staff augmentation, AI Agents, and more and has a midsize team.The agency was established in 2006.Read More
Clients
Pfizer Philips Healthcare Synthesis Health ABBIndustries
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23$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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24$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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25$50,000+10 - 49 employeesLondon, EnglandTogether is a branding company launched in 2018. The small team specializes in Branding, UX/UI Design, Product Design, Web Development, and more. The agency is located in London, England; New York, New York and San Francisco, California.Read More
Clients
UnitIndustries
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26$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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27$10,000+50 - 249 employeesLondon, EnglandFounded in 2020, Old.St Labs is an AI company. The midsize team provides Artificial Intelligence, Custom Software Development, Web Development, and Mobile App Development. The firm is based in London, England.Read More
Clients
Mariana UFP The Military App Allegr East CareIndustries
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28$1,000+50 - 249 employeesLondon, EnglandMindrops is a midsize Delhi, India-based custom software development firm. They specialize in Custom Software Development, Web Development, Mobile App Development, UX/UI Design, and more and were founded in 2016.Read More
Clients
India Post Unilever UNDP India Barbeque NationIndustries
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29$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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30$25,000+50 - 249 employeesLondon, EnglandImaginary Cloud, a software development company, is located in London, England; Lisboa, Portugal; Coimbra, Portugal and San Francisco, California. The midsize team provides Custom Software Development, Artificial Intelligence, Mobile App Development, Web Development, and more and was founded in 2010.Read More
Clients
NokiaIndustries
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Check out a JavaScript Developers in London with the most new reviews in the past 12 months.
JavaScript Developers
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