Top 100 JavaScript Development Companies in London

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Top 100 JavaScript Development Companies in London

The Best of March 2024

Looking 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. 

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List of the Best London JavaScript Developers

  • 1
    (72 Reviews) 4.9
    • Timeliness

      4.8
    • Service Excellence

      4.9
    • Value

      4.7
    • Would Recommend

      5.0
    • $25,000+
    • 1,000 - 9,999 employees
    • London, United Kingdom

    Headquartered in New York, Vention is a custom software development company with additional offices in Marietta, Ga. and Iselin, N.J. Since 2002, Vention has helped startups and fast-growing tech companies fill in their talent gap and create robust web and mobile solutions that users love. To date, Vention's talent pool includes 3500+ engineers with experience in all of the latest technologies.

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    Clients

    • IBM
    • PayPal
    • IC Markets
    • StoneX

    Industries

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  • 2
    (47 Reviews) 4.8
    • Timeliness

      4.6
    • Service Excellence

      4.8
    • Value

      4.5
    • Would Recommend

      4.9
    • $25,000+
    • 250 - 999 employees
    • London, United Kingdom

    Infinum is a software development company in San Francisco, CA. The 50+ team has equal experience in mobile and web development. They work with clients from a variety of industries, including business and financial services and automotive.

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    Clients

    • Philips
    • Nike
    • Porsche
    • Coca-Cola

    Industries

  • 3
    (1 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      5.0
    • Would Recommend

      5.0
    • $5,000+
    • 10 - 49 employees
    • London, United Kingdom
    Buttercups 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.
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    Clients

    • MobiWallet
    • MD
    • BTZ
    • EkoBUD

    Industries

  • 4
    (34 Reviews) 4.9
    • Timeliness

      4.9
    • Service Excellence

      4.9
    • Value

      4.6
    • Would Recommend

      4.9
    • $25,000+
    • 50 - 249 employees
    • London, United Kingdom

    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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    Clients

    • Nokia
    • Sage
    • Ernst & Young
    • BNP Paribas

    Industries

  • 5
    (28 Reviews) 5.0
    • Timeliness

      4.9
    • Service Excellence

      5.0
    • Value

      4.9
    • Would Recommend

      5.0
    • $25,000+
    • 50 - 249 employees
    • London, United Kingdom

    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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    Clients

    • Ocean Bottle
    • TOAD.ai
    • MyBricks
    • Moviecoin

    Industries

  • 6
    (42 Reviews) 4.9
    • Timeliness

      4.8
    • Service Excellence

      4.9
    • Value

      4.9
    • Would Recommend

      4.9
    • $25,000+
    • 50 - 249 employees
    • Rickmansworth, United Kingdom

    Light IT is a data science consulting and software development company located in Zaporizhzhia, Ukraine and founded in 2006. They have 132 employees who provide custom web and mobile software development services to various-size companies in advertising, finance, healthcare, travel, and education. This includes IT consulting, market research, QA, design, and business analytics.

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    Clients

    • Pfizer
    • BrokerIQ
    • Ultra
    • Gaming Engage

    Industries

  • 7
    (23 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      5.0
    • Would Recommend

      5.0
    • $25,000+
    • 50 - 249 employees
    • London, United Kingdom

    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.

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    Clients

    • The Venue Report
    • Shepard Health
    • FlyJets
    • Thrive Card

    Industries

  • 8
    (18 Reviews) 5.0
    • Timeliness

      4.9
    • Service Excellence

      5.0
    • Value

      5.0
    • Would Recommend

      5.0
    • $10,000+
    • 250 - 999 employees
    • Barking, United Kingdom

    Webskitters LLC is a software company headquartered in Miami, Fla. Founded in 2010, Webskitters LLC has a team of around 125 employees who specialize in web development, mobile app development, and mobile app modernization, primarily for small business clients.

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    Clients

    • Mercedes-AMG
    • CSC Group
    • Fazwaz
    • Rad Golf

    Industries

  • 9
    (7 Reviews) 4.1
    • Timeliness

      3.9
    • Service Excellence

      4.1
    • Value

      4.4
    • Would Recommend

      4.2
    • $10,000+
    • 50 - 249 employees
    • London, United Kingdom

    SovTech is a custom software development company based in Johannesburg with offices in London and Nairobi. Founded in 2012, they work with enterprise and midmarket businesses with a focus on clients in the financial services industry. 

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    Clients

    • Discovery
    • Deloitte
    • Standard Bank
    • SureSwipe

    Industries

  • 10
    (26 Reviews) 4.9
    • Timeliness

      4.8
    • Service Excellence

      4.9
    • Value

      4.7
    • Would Recommend

      5.0
    • $25,000+
    • 50 - 249 employees
    • London, United Kingdom

    Blink22 is a mobile and web development firm based in Alexandria, Egypt. Founded in 2015, their team of 125 serves clients in the transportation and communal workplace sectors. Services include, iOS, Android, and React Native development.

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    Clients

    • Jumia
    • Careem
    • Khatabook
    • Geidea

    Industries

  • 11
    (78 Reviews) 4.8
    • Timeliness

      4.7
    • Service Excellence

      4.8
    • Value

      4.7
    • Would Recommend

      4.9
    • $25,000+
    • 250 - 999 employees
    • London, United Kingdom

    TekRevol is an app development startup of 18 employees. Founded in 2014, their headquarters is in Newark, Calif. They offer various services: mobile app development, web development, e-commerce development, blockchain, and more. They primarily work with enterprise and midmarket clients in the e-commerce and business services industries.
     

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    Clients

    • The University of Toronto
    • Waste Connections
    • Oz Leasing
    • Beach Bandits

    Industries

  • 12
    (15 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      4.8
    • Would Recommend

      4.9
    • $25,000+
    • 50 - 249 employees
    • Kingston upon Thames, United Kingdom

    Uinno is a consultancy, solution design, and software development agency founded in 2019. Uinno has 50+ people on board with headquarters based in Ukraine and Estonia. The company works with midmarket companies and fast-growing startups. They are fully focused to solve your business challenges. No matter the technology or architecture, Uinno will find the most optimal solution and deliver a ready-to-operate product.

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    Clients

    • OnlyFans
    • Play HQ
    • University of Melbourne
    • Expedo

    Industries

  • 13
    (30 Reviews) 5.0
    • Timeliness

      4.9
    • Service Excellence

      5.0
    • Value

      4.9
    • Would Recommend

      5.0
    • $10,000+
    • 10 - 49 employees
    • London, United Kingdom

    Founded in 2007, Softblues is a software development company headquartered in Lviv, Ukraine. Their team of approximately 22 employees serves small to mid-sized businesses, particularly in the e-commerce and education sectors. They specialize in custom software as well as web and e-commerce development.

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    Clients

    • Pinterest
    • FieldBI
    • AutoBI
    • AgroTop

    Industries

  • 14
    (15 Reviews) 4.8
    • Timeliness

      4.9
    • Service Excellence

      4.8
    • Value

      4.7
    • Would Recommend

      4.9
    • $25,000+
    • 10 - 49 employees
    • london, United Kingdom

    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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    Clients

    • DoctorLink
    • AllPlants
    • ProperCorn
    • Kano

    Industries

  • 15
    (11 Reviews) 5.0
    • Timeliness

      4.8
    • Service Excellence

      5.0
    • Value

      5.0
    • Would Recommend

      5.0
    • $100,000+
    • 50 - 249 employees
    • London, United Kingdom

    Yojji is a software development firm based in London with an office in Kharkiv, Ukraine. The firm, founded in 2017, has more than 35 employees and provides custom software development, web development, mobile app development, web design, product design, and application testing services. Yojji serves small and larger-sized companies in various industries that include financial services, business services, and health care & medical. 

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    Clients

    • Valapay LTD
    • OSU LTD
    • Mabbly
    • Mrs Wordsmith Limited

    Industries

  • 16
    (21 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      4.7
    • Would Recommend

      5.0
    • $25,000+
    • 10 - 49 employees
    • Farnham, United Kingdom

    Valiant Design is a strategic creative agency located in Farnham, England. They have about 13 teammates. Since 2010, they have provided branding, web design, and packaging design services to primarily midmarket agencies in the health care and medical, business services, and manufacturing industries.

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    Clients

    • Contec Inc
    • Fine Group
    • Sinequa
    • WFS Global

    Industries

  • 17
    (14 Reviews) 4.8
    • Timeliness

      4.7
    • Service Excellence

      4.8
    • Value

      4.6
    • Would Recommend

      4.9
    • $50,000+
    • 250 - 999 employees
    • London, United Kingdom

    SPD Group is an IT and development company in London, United Kingdom; Kyiv and Cherkasy, Ukraine; and Tel Aviv, Israel. Founded in 2006, they have about 16 employees that serve mostly midmarket and small-business clients in the business, financial, and IT sectors. Services include custom software development, AI, and IoT development.

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    Clients

    • PitchBook Data
    • POYNT
    • Morningstar
    • floLive

    Industries

  • 18
    (8 Reviews) 5.0
    • Timeliness

      4.8
    • Service Excellence

      5.0
    • Value

      4.8
    • Would Recommend

      5.0
    • $1,000+
    • 10 - 49 employees
    • London, United Kingdom

    Agile Digital Agency is a marketing technology agency based in London. The agency has a team of less than ten that provides email marketing, SEO, and other digital marketing services to small and midmarket companies and institutions.

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    Clients

    • Singleton Law Firm (USA)
    • EFQM (Global)
    • HRC International (Netherlands)
    • Userlane (Germany)

    Industries

  • 19
    (119 Reviews) 4.9
    • Timeliness

      4.8
    • Service Excellence

      4.9
    • Value

      4.6
    • Would Recommend

      4.9
    • $50,000+
    • 1,000 - 9,999 employees
    • London, United Kingdom

    Andersen is an international custom software development company that, among other things, specializes in healthcare software development. Since its founding in 2007, the company has opened more than ten development centers and about ten sales offices worldwide. More than 2700 highly qualified specialists work on developing, customizing corporate IT solutions, web applications, and mobile applications. Andersen has completed over 950 projects and received hundreds of positive reviews from clients worldwide. Today the company is working on over 250 projects. Our technology stack includes .NET, C#, Java, Python, PHP, Node.js, TypeScript, Golang, C++, JavaScript, Angular, React.js, Vue.js, HTML, CSS, Java (Android), Swift / Objective C (iOS), React Native, and more. We also offer manual and automated testing, business and data analysis, UI/UX design, DevOps services, IT security management, and L1, L2, L3 support.

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    Clients

    • Samsung
    • Johnson & Johnson
    • GlobePayroll
    • Siemens

    Industries

  • 20
    (13 Reviews) 5.0
    • Timeliness

      4.8
    • Service Excellence

      5.0
    • Value

      4.8
    • Would Recommend

      5.0
    • $10,000+
    • 10 - 49 employees
    • London, United Kingdom

    Hiyield is a small website development firm located in St. Austell, United Kingdom. Launched in 2018, the team focuses on web development, custom software development, ux/ui design, application management & support, and more.

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    Industries

  • 21
    (4 Reviews) 5.0
    • Timeliness

      4.9
    • Service Excellence

      5.0
    • Value

      4.8
    • Would Recommend

      5.0
    • $50,000+
    • 50 - 249 employees
    • London, United Kingdom

    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.

    Read More

    Industries

  • 22
    (17 Reviews) 4.9
    • Timeliness

      4.9
    • Service Excellence

      4.9
    • Value

      4.4
    • Would Recommend

      4.9
    • $100,000+
    • 10 - 49 employees
    • Sarratt, United Kingdom

    Clock Limited is a digital design and build company. Founded in 1997, the company is headquartered in Kings Langley, United Kingdom. They have a team of around 35 employees who focus on custom software, web, and mobile app development.

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    Clients

    • International Tennis Federation
    • Leicester Tigers
    • Northampton Saints
    • Wall Street Journal

    Industries

  • 23
    (19 Reviews) 4.7
    • Timeliness

      4.5
    • Service Excellence

      4.7
    • Value

      4.7
    • Would Recommend

      4.8
    • $25,000+
    • 50 - 249 employees
    • London, United Kingdom

    Located in Ahmedabad, India with additional offices in the US and UK, Innovify has been delivering high quality solutions since 2011. Although the team of nearly 130 specializes in mobile app development, they also engage in growth hacking, consulting, and UX design.

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    Clients

    • ARM INC
    • Vonage
    • British Council
    • BBC

    Industries

  • 24
    (10 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      5.0
    • Would Recommend

      5.0
    • $10,000+
    • 10 - 49 employees
    • London , United Kingdom

    Web development firm Wise Vision was founded in 2018. The agency provides web development, e-commerce development, accounting, enterprise app modernization, and more and has a small team. The agency is in L'viv, Ukraine.

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    Clients

    • Beep Auto
    • KSM Starter
    • HUMA
    • Teraseya

    Industries

  • 25
    (47 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      4.9
    • Would Recommend

      5.0
    • $5,000+
    • 10 - 49 employees
    • London, United Kingdom

    ExpandX is a web services provider and digital marketing agency headquartered in Sofia, Bulgaria. It also has locations in London, New York, Munich and Barcelona. The company was founded in 2015 serving clients globally with projects of different sizes and niches. ExpandX provides web development services, e-commerce solutions, social media marketing, PPC, web design, video marketing, and other related digital services.

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    Clients

    • High Touch Investment Corp Inc (USA)
    • Assent Inc (Canada)
    • Luuup Textile Recycling (Switzerland)
    • Abeauty (Italy)

    Industries

  • 26
    (34 Reviews) 4.9
    • Timeliness

      4.7
    • Service Excellence

      4.9
    • Value

      4.8
    • Would Recommend

      4.9
    • $25,000+
    • 10 - 49 employees
    • London, United Kingdom

    Together is a full-service agency that builds brands, websites and digital products for good tech companies around the world.

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    Clients

    • Unit
    • Stytch
    • Amazon
    • Mosaic

    Industries

  • 27
    (15 Reviews) 5.0
    • Timeliness

      4.9
    • Service Excellence

      5.0
    • Value

      5.0
    • Would Recommend

      5.0
    • $10,000+
    • 10 - 49 employees
    • London, United Kingdom

    Old.St Labs is a software development business based in London. The business, founded in 2020, has a team of more than ten that provides custom software development, mobile app development, UX/UI design, web design & development, and AI services. Old.St Labs serves small and mid-market companies in the advertising & marketing, education, financial services, health care & medical, and legal industries.

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    Clients

    • Kopona
    • Brain.Health
    • CityMunch
    • Altus Investment Management Ltd

    Industries

  • 28
    (4 Reviews) 4.9
    • Timeliness

      4.9
    • Service Excellence

      4.9
    • Value

      5.0
    • Would Recommend

      5.0
    • $25,000+
    • 10 - 49 employees
    • London, United Kingdom

    Filter Digital, a website development company, was launched in 2016. Their small team is headquartered in London, United Kingdom. The agency focuses on web development, mobile app development, custom software development, and digital strategy.

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    Clients

    • Ennismore
    • The Inside Out Community
    • Homeprotect
    • Tomorrow's Guides

    Industries

  • 29
    (20 Reviews) 4.9
    • Timeliness

      4.9
    • Service Excellence

      4.9
    • Value

      4.8
    • Would Recommend

      4.9
    • $10,000+
    • 50 - 249 employees
    • London, United Kingdom

    Angry Nerds is a software development house based on Wroclaw, Poland. Established in 2015, they have more than 60 employees who provide app development services for global clients consisting mostly of small and mid-market firms. Their services include custom software development, web development, and mobile development for Android and iOS. They also offer staff augmentation.

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    Clients

    • Homedot app
    • Cats and Dogs app
    • NeoTaste
    • Epaka

    Industries

  • 30
    (7 Reviews) 5.0
    • Timeliness

      4.9
    • Service Excellence

      5.0
    • Value

      4.5
    • Would Recommend

      5.0
    • $10,000+
    • 2 - 9 employees
    • London, United Kingdom

    Webpop Design is a web design agency based In London. Founded in 2008, their small team is known for their UX/UI design, branding and SEO efforts as well. They work primarily with small businesses in multiple industries.

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    Clients

    • Datameer
    • Dandapani
    • Synchtank
    • Pineapple Contracts

    Industries

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