Top 100 JavaScript Development Companies in London
The Best of June 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$10,000+50 - 249 employeesLondon, EnglandEstablished in 2012, unicrew is a midsize custom software development firm. Their team focuses on Custom Software Development, Web Development, and Mobile App Development. The agency is based in Kraków, Poland; Ormond Beach, Florida; London, England and Tallinn, Estonia.Read More
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Jack Cooper Transport Bigfood Group Booked It Open Room Inc.Industries
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2$10,000+250 - 999 employeesLondon, EnglandLocated in San Francisco, California; Bengaluru, India and London, England, GeekyAnts is a mobile application development firm. They focus on Mobile App Development, Custom Software Development, Web Development, Artificial Intelligence, and more and were established in 2006.Read More
Clients
Siveco Romania Olive Garden Darden KhataBookIndustries
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3$10,000+10 - 49 employeesLondon, EnglandEstablished in 2019, FocusReactive is a small website development firm based in Amsterdam, Netherlands; London, England; Warszawa, Poland and New York, New York. Their services include Web Development, Custom Software Development, E-Commerce Development, and Web Design.Read More
Clients
EasyPark Arrive RealThreadIndustries
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4$50,000+1,000 - 9,999 employeesLondon, EnglandVention is an IT staff augmentation company. Their large team is in New York, New York; London, England; Marietta, Georgia and San Francisco, California. The company focuses on IT staff augmentation, Custom Software Development, Web Development, Mobile App Development, and more. The company was launched in 2002.Read More
Clients
IBM PayPal pwc IC MarketsIndustries
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5$25,000+50 - 249 employeesRickmansworth, EnglandLight IT Global is a website development company founded in 2006. The company offers Web Development, Custom Software Development, Mobile App Development, Artificial Intelligence, and more and has a midsize team.Read More
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Pfizer Philips Healthcare Synthesis Health ABBIndustries
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6$25,000+50 - 249 employeesLondon, EnglandRead More
Imaginary Cloud is a Web, Mobile and AI Software Development and UX/UI Design Company with offices in the UK, US and Portugal. In the last 11 years they have helped build and scale more than 300 applications, from Start-ups, Scale-ups to Enterprises, winning several global awards. They offer a comprehensive skill set of developers, data scientists and designers coupled with a streamlined agile process.
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NokiaIndustries
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7$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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8$10,000+50 - 249 employeesLondon, EnglandValor Software is a Lakewood, Colorado-based web design company. The midsize company was established in 2013. Their services include Web Design, UX/UI Design, IT strategy consulting, IT staff augmentation, 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$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
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Ocean BottleIndustries
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11$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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12$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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13$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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14$25,000+10 - 49 employeesBromley, EnglandGoodface agency is an UX agency. They are in Bromley, England and Kyiv, Ukraine and have a small team that provides UX/UI Design, Custom Software Development, Web Development, Web Design, and more. The company was founded in 2016.Read More
Clients
Magnetiq Bank 365 Games Corefy KARL STORTZIndustries
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15$25,000+250 - 999 employeesLondon, EnglandLaunched in 2000, Future Processing is a software development company. In Gliwice, Poland; Ternopil, Ukraine; London, England and Düsseldorf, Germany, their midsize team specializes in Custom Software Development, cloud consulting & SI, BI & big data consulting & SI, Web Development, and more.Read More
Clients
AllocateIndustries
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16$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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17$10,000+250 - 999 employeesLondon, EnglandSENLA is a midsize software development company. Located in Warszawa, Poland; London, England and Zagreb, Croatia, the agency was established in 2012. Their team focuses on Custom Software Development, Web Development, Mobile App Development, Blockchain, and more.Read More
Clients
Abbott BOSCH KPMG Western UnionIndustries
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18$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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19$1,000+2 - 9 employeesLondon, EnglandSmall SEO company Agile Digital Agency, is headquartered in London, England. They provide Search Engine Optimization, Web Design, and Web Development and were launched in 2018.Read More
Clients
Singleton Law Firm (USA)Industries
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20$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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21$10,000+250 - 999 employeesLondon, EnglandFounded in 2000, Instinctools is a midsize big data analytics company based in Stuttgart, Germany; Warszawa, Poland; Mississauga, Canada and Wilmington, Delaware. Their services include BI & big data consulting & SI, IT staff augmentation, Custom Software Development, Web Development, and more.Read More
Clients
Daimler Fujitsu Nostrum SpexAIIndustries
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22$25,000+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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23$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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24$25,000+50 - 249 employeesLondon, EnglandMidsize software development firm GoodCore Software, is headquartered in London, England; Karachi, Pakistan and Cyberjaya, Malaysia. Founded in 2005, the team specializes in Custom Software Development, Artificial Intelligence, Web Development, IT strategy consulting, and more.Read More
Clients
PMLL GCBF Hirevine London Women's ClinicIndustries
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25$25,000+50 - 249 employeesLondon, EnglandWebbyLab is an IoT development company founded in 2011. They are based in Kyiv, Ukraine and London, England and have a midsize team. Their services include IoT development, Artificial Intelligence, Web Development, and AI Agents.Read More
Clients
AMG MercedesIndustries
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26$5,000+10 - 49 employeesLondon, EnglandBurst Digital is a web design agency. They specialize in Web Design, Web Development, Search Engine Optimization, Branding, and more and were founded in 2018. Their small team is London, England-based.Read More
Clients
Vivienne Westwood - The Vivienne Foundation Artisan AI Cogency Global Moonbeam Car WashIndustries
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27$25,000+50 - 249 employeesLondon, EnglandRead More
Located in London, England; Sydney, Australia and Sunny Isles Beach, Florida, Magora is a software development company. The midsize team specializes in Custom Software Development, Mobile App Development, Web Development, Artificial Intelligence, and more. The agency was launched in 2010.
Clients
DanoneIndustries
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28$10,000+50 - 249 employeesKingston upon Thames, EnglandRead 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.
Clients
OnlyFansIndustries
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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+250 - 999 employeesLondon, EnglandRobosoft Technologies Inc. Is a San Francisco, California-based app development company. They offer Mobile App Development, UX/UI Design, Web Development, Custom Software Development, and more and were launched in 1996.Read More
Clients
Warner Bros. Discovery HSBC McDonalds Mercury FinanceIndustries
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