Top 100 JavaScript Development Companies in London

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Top 100 JavaScript Development Companies in London

February 2023

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

  • 31
    • Scheduling

      5.0
    • Quality

      4.9
    • Cost

      4.9
    • NPS

      4.9
    Read Full Reviews on Clutch Visit Site
    • $5,000+
    • 10 - 49 employees
    • London, United Kingdom

    Founded in 2019, Brand Vision is a web design company. Their small team is in Toronto, Canada. Their services include web design, social media marketing, branding, market research, and more.

    Clients

    • Winona Park Towns
    • ForestHill Brokerage
    • Diamond Realty Developers
    • Quick Consols

    Industries

    Notable Project

    Brand Vision developed an e-commerce website for a production company. Following an onboarding phase, they brainstormed ideas for the design, laid out a project roadmap, and rebuilt the platform.

    "The most impressive things about Brand Vision are their responsiveness and efficiency."

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  • 32
    • $5,000+
    • 10 - 49 employees
    • London, United Kingdom
    Based in New York, New York and Kyiv, Ukraine, LOOKSGREAT.STUDIO is a web design company. The small team focuses on web design, web development, branding, and ux/ui design and was launched in 2009.

    Clients

    • MOTUL Official Online Store
    • Washington Academy
    • Upperground

    Industries

    Notable Project

    LOOKSGREAT.STUDIO developed a new website for a freelance platform. They were hired again for their quality of work in their previous collaborations.

    "The whole team is really nice, very supportive, and professional."

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  • 33
    • Scheduling

      4.8
    • Quality

      4.9
    • Cost

      4.8
    • NPS

      4.9
    Read Full Reviews on Clutch Visit Site
    • $25,000+
    • 250 - 999 employees
    • London , United Kingdom

    RNDpoint (former PST Labs) is a London-based development firm. The team of over 50 provides mobile app, custom software and web development services. Founded in 2014, they primarily serve enterprise businesses in the financial services industry.

    Clients

    • First Abu Dhabi Bank
    • Eurasian Bank
    • Breaking Equity
    • Loop

    Industries

    Notable Project

    RNDpoint handles outsourced IT services for a software development company. In efforts to scale up the client's internal team, they provide development efforts on a wide range of projects.

    “They consistently provide quality resources that can accomplish any level of complexity that the project requires.”

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  • 34
    • $25,000+
    • 10 - 49 employees
    • London, 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.

    Clients

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

    Industries

    Notable Project

    Clock Limited provided frontend design and development to enhance two companies’ websites. Along with infrastructure hosting and database management, they trained content teams to use the CMS.

    “Once I established a relationship with their helpful team, I hired them again without hesitation.”

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  • 35
    • Scheduling

      4.6
    • Quality

      4.6
    • Cost

      4.4
    • NPS

      4.8
    Read Full Reviews on Clutch Visit Site
    • $25,000+
    • 10 - 49 employees
    • London, United Kingdom

    Bit Zesty is a custom software development firm. They provide custom software development, ux/ui design, web development, application management & support, and more and were launched in 2009. Their small team is London, United Kingdom-based.

    Clients

    • Oxford Medical Simulation
    • Trussell Trust (UK Foodbanks)
    • Queen's Awards for Enterprise
    • HMRC

    Industries

    Notable Project

    Bit Zesty was tasked with website maintenance and support for a human rights charity. They used Trello to manage the development process. They also completed a feature development sprint.

    "They didn't hesitate to challenge our thinking, deconstruct ideas, and propose solutions we may have overlooked."

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  • 36
    • Scheduling

      5.0
    • Quality

      5.0
    • Cost

      4.9
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $25,000+
    • 10 - 49 employees
    • London, United Kingdom

    Core Blue Ltd is a software engineering company based in London with an office in Plymouth, U.K. The company, founded in 2015, has a team of less than ten that provides custom software development, mobile app development, web development, and IoT development services to various companies.

    Clients

    • Bank of Kigali
    • Kuoni
    • SAP
    • PayPoint

    Industries

    Notable Project

    CoreBlue creates a scalable web app for a luxury holiday rental firm by making its core system a web API. They also use React.js and Next.js to build the interface as a server-side rendered single-page app.

    "CoreBlue is receptive to feedback and worked with me to ensure we hold the platform to the highest standard."

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  • 37
    • $25,000+
    • 10 - 49 employees
    • London, United Kingdom

    We Are Kitty is a small London, United Kingdom-based user experience design company. Founded in 2017, the team provides ux/ui design, e-commerce development, web design, web development, and more.

    Industries

    Notable Project

    A gaming company hired We Are Kitty to provide SEO and content development. Their efforts include keyword research and paid media activities to drive organic traffic and new players to the client's site.

    "They're very cost-effective, and I enjoy working with them."

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  • 38
    • $50,000+
    • 50 - 249 employees
    • London, United Kingdom

    Intellectsoft is a boutique digital transformation consultancy headquartered in Palo Alto, California. The Company provides cutting edge engineering solutions for global and Fortune 500 companies with the mission to help enterprises accelerate adoption of new technologies, untangle complex issues that always emerge during digital evolution, and orchestrate ongoing innovation.

    Intellectsoft maintains its advanced domain expertise through five dedicated labs:  Cognitive Computing, Decentralized Applications (i.e. Blockchain), Internet-of-Things (IOT), Premier Customer Experience (CX), and Mixed Reality (AR, VR).

    Established in 2007, Intellectsoft operates across multiple offices with the engineering centers in the U.S., the U.K., the Nordic region and Eastern Europe.

    Clients

    • Mitsubishi
    • Fleet Nurse
    • Harley-Davidson
    • Jaguar Land Rover

    Industries

    Notable Project

    Intellectsoft was hired to develop a unique mobile gaming app for iOS. They immediately impressed the client with their professionalism and attention to detail.

    "They couldn't have done anything more."

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  • 39
    • $10,000+
    • 10 - 49 employees
    • London, United Kingdom

    Asper Brothers is a product design & development firm based in London, United Kindom, and offices in Warsaw, Poland. It was founded in 2007 and has more than 35 employees that specialize in providing web development, custom software development, and e-commerce development services to a wide range of clients, mainly focusing on business services, IT, real estate, marketing & advertising, automotive, education, non- profit, e-commerce, and other industries. 

    Clients

    • CaseMGR
    • XREF
    • Vaping360
    • Pallo

    Industries

    Notable Project

    ASPER’s team developed a website that provides information on the knowledge and work of real estate agents, where customers can find insights before starting a collaboration.​

    "ASPER is a professional group, and they've been able to give us good feedback and ideas."

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  • 40
    • Scheduling

      4.9
    • Quality

      4.9
    • Cost

      5.0
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $1,000+
    • 2 - 9 employees
    • London, United Kingdom

    Pixated is a marketing agency in London, England. Founded in 2018, they have about 2 employees that serve small-business and midmarket clients in the gaming, e-commerce, and advertising industries. Services include social media marketing, mobile app marketing, and PPC.

    Clients

    • Tesco
    • Wicked Gummy Co
    • Millionaire Beauty
    • Vitamasques

    Industries

    Notable Project

    Pixated handles digital marketing services for a cosmetics company. In efforts to increase the brand's online presence, their team provides advertising and SEO efforts as well as makes website tweaks as needed.

    “They deliver on their promises.”

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  • 41
    • $10,000+
    • 2 - 9 employees
    • London, United Kingdom

    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. 

    Clients

    • Accenture
    • Aerial Empire
    • Bongo's Bingo
    • Boost

    Industries

    Notable Project

    An online learning program hired Lambert Labs as technical experts for some of their curricula. The team provided deliverables in the form of code base, requirement documentation, exercise, and more.

    "Lambert Labs was always going the extra mile to ensure the experience for our end users was going to be optimal."

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  • 42
    • $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.

    Clients

    • Datameer
    • Dandapani
    • Synchtank
    • Pineapple Contracts

    Industries

    Notable Project

    Webpop Design has provided platform development services to a consulting firm. They’ve used WordPress and WooCommerce to build the platform, which they’ve also integrated with MailChimp.

    “Webpop has given us exactly what we were looking for."

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  • 43
    • $25,000+
    • 10 - 49 employees
    • London, United Kingdom

    Purr Digital is a software development agency that has been offering web development, mobile app development, and custom software development to their small business and mid-market clients in the hospitality, arts and entertainment, and consumer products and services industries since 2013. Their 50 employees are based out of their London and Birmingham, UK offices. 

    Clients

    • Elder
    • Loyalty Lion
    • Unicef
    • MCFC

    Industries

    Notable Project

    Purr Digital developed and designed two web platforms for the event cinema industry. The sites were meant to ease the distribution and ticketing process. They also built a data search tool.

    "Purr Digital is approachable and flexible."

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  • 44
    • Scheduling

      4.6
    • Quality

      4.6
    • Cost

      4.4
    • NPS

      4.8
    Read Full Reviews on Clutch Visit Site
    • $10,000+
    • 10 - 49 employees
    • London, United Kingdom

    Catch is a digital experience agency founded in 2007. Based in London, United Kingdom, they also have an office in Madrid, Spain, and a team of over 30 employees. They specialize in web development, UX/UI design, and content marketing. 

    Clients

    • Sharp
    • Tony Blair Institute
    • Worldpay
    • The Body Shop

    Industries

    Notable Project

    Catch delivered a web platform for a professional association’s members and a Salesforce CRM. They worked with third-parties to build and integrate custom APIs and delivered an authentication feature.

    "The project underwent acute changes, including in project managers, and Catch dealt with it all with panache." 

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  • 45
    • Scheduling

      4.8
    • Quality

      5.0
    • Cost

      4.9
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $10,000+
    • 2 - 9 employees
    • London, United Kingdom

    56 Degrees is a web development agency with a team of under 10 employees. Based in London and founded in 2010, they provide web development, web design, and e-commerce development services. 

    Clients

    • GiffGaff Studio
    • Budweiser
    • ZAK
    • Hamson Barron Smith

    Notable Project

    56 Degrees provides software development services for an online auction company. Their work involves creating wireframes and performing tests. One person works directly with the client for the project. 

    “The team is on the ball and always prioritizes everything we need.”

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  • 46
    • $10,000+
    • 2 - 9 employees
    • London, United Kingdom

    Browser London is a digital product agency based in London, United Kingdom. This company has 11 employees and was founded in 2008. Services offered by Browser London include UI/UX design, web design, and custom software development for companies of all sizes.

    Clients

    • Mayor of London
    • Lightning API
    • Shell
    • NHS

    Industries

    Notable Project

    Browser London provides WordPress web design and development services for a London government office. Their work is ongoing with updating site functionality and a scheduled site rehaul in the near future.

    "They're always ready to help us in whatever way they can."

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  • 47
    • Scheduling

      5.0
    • Quality

      5.0
    • Cost

      5.0
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $25,000+
    • 10 - 49 employees
    • London, United Kingdom

    Founded in 2014, SoBold is a design and development agency headquartered in London.  Their team of 10 specialize in web development, web design, print design, and social media marketing services for clients. Their clients primarily work with with small and mid market companies in the education, health care, hospitality, energy, and consumer product industries. 

    Clients

    Industries

    Notable Project

    SoBold designed and developed a website to support the launch and digital adoption of a patient portal app. The team created a mock-up site for the client to help decide on the final designs and functions.

    "I'm impressed by their response times, expertise and that nothing is ever a problem."

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  • 48
    • Scheduling

      4.9
    • Quality

      5.0
    • Cost

      5.0
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $1,000+
    • 10 - 49 employees
    • London, United Kingdom

    TH-EY is a development agency in London, England. Founded in 2017, they have about 8 employees that serve clients in a variety of industries. Services include custom software development, web development, and mobile app development.

    Clients

    • Launchworks
    • Own-Kind
    • pixable
    • First Ascent

    Industries

    Notable Project

    TH-EY provided web development services for a B2B SaaS company. The team was hired to create a web application to help with the client's office employee management. 

    "All the features that we required in the initial estimation were developed plus a couple of extra ones."

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  • 49
    • $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.

    Clients

    • CGE Partners
    • HSS Hire Group
    • Thames Reach
    • Armadillo

    Industries

    Notable Project

    Agile Digital Agency re-platformed an outdated WordPress site into a new, interactive solution. The final product helped connect young people with companies to learn about career opportunities.

    “It’s comfortable chatting with them because they’re great people.”

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  • 50
    • Scheduling

      5.0
    • Quality

      4.9
    • Cost

      4.8
    • NPS

      4.9
    Read Full Reviews on Clutch Visit Site
    • $10,000+
    • 50 - 249 employees
    • London, United Kingdom

    Fourmeta is an e-commerce development firm founded in 2017. In London, United Kingdom, their midsize team offers e-commerce development, ux/ui design, and web development.

    Industries

    Notable Project

    Fourmeta developed a web app from scratch for a recommence company. The team also provided UX design for an analytical dashboard, feature enhancement, storefront application, and inventory management system.

    "They were very proficient and direct, and that worked great with us!"

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  • 51
    • $5,000+
    • 10 - 49 employees
    • London, United Kingdom

    Pixelette Technologies Ltd is a SEO services firm headquartered in London, United Kingdom. They focus on search engine optimization, conversion optimization, digital strategy, social media marketing, and more and were launched in 2018.

    Industries

    Notable Project

    A veterinary group has hired Pixelette Technologies to add cryptocurrency fundraising capabilities to their website, adding NFT-based fundraising. They’ve altered the site’s content to improve search rankings. 

    Their team is really great to work with.”

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  • 52
    • Scheduling

      4.3
    • Quality

      4.6
    • Cost

      4.6
    • NPS

      4.7
    Read Full Reviews on Clutch Visit Site
    • $10,000+
    • 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.

    Clients

    • ARM INC
    • Vonage
    • British Council
    • BBC

    Industries

    Notable Project

    Innovify developed the MVP of an interactive mobile platform that allows users to pre-order food. The team built both the Android and iOS versions of the app. They continue to handle succeeding iterations.

    “Even though we worked using an outsourced model, Innovify gave me the feeling of having an in-house team.”

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  • 53
    • Scheduling

      4.5
    • Quality

      5.0
    • Cost

      5.0
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $25,000+
    • 10 - 49 employees
    • London, United Kingdom

    Headquartered in Southend-on-Sea, United Kingdom, Enhanceable is a small software development firm. They specialize in custom software development, mobile app development, and IT strategy consulting and were founded in 2019.

    Notable Project

    Enhanceable has built a custom software solution for a travel company. They’ve developed a tool that connects the client’s team with customers needing assistance during their vacation.

    “We’ve been most impressed by the team’s attention to detail; they’ve delivered what we asked for and more."

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  • 54
    • Scheduling

      4.5
    • Quality

      4.6
    • Cost

      4.4
    • NPS

      4.6
    Read Full Reviews on Clutch Visit Site
    • $50,000+
    • 50 - 249 employees
    • Sutton, United Kingdom

    Geeks is a software development company in London. Founded in 2007, Geeks' team of 85 specializes in custom software development, web development, and mobile app development, primarily for midmarket clients in media and govenment.

    Clients

    • BBC
    • EasyJet
    • Euromoney
    • Mitie

    Industries

    Notable Project

    Geeks managed all aspects of development in creating a timeline visualization engine. The system extracts and imports historical data from a variety of sources using JavaScript.

    “While the others seemed wary of dealing with large databases and files, they were very enthusiastic about our project.”

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  • 55
    • Scheduling

      5.0
    • Quality

      4.9
    • Cost

      4.9
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $25,000+
    • 2 - 9 employees
    • London, United Kingdom

    Hero Team is a digital agency located in London. Founded in 2018, their services include mobile app and web development in addition to UX/UI design. Their team of 3 works with small businesses.

    Clients

    • Hugo
    • Cuckoo Broadband
    • Virtuall
    • Tried And Supplied

    Notable Project

    Hero Team is developing the frontend of a platform that allows companies to mitigate risks posed by suppliers. They have also worked on the API and conducted tests.

    “They are advisors as well as developers.”

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  • 56
    • Scheduling

      4.4
    • Quality

      4.8
    • Cost

      4.5
    • NPS

      4.7
    Read Full Reviews on Clutch Visit Site
    • $5,000+
    • 10 - 49 employees
    • London, United Kingdom

    Imobisoft is a full-service mobile app & software development company based in Coventry, U.K., with an office in London. The company, founded in 2007, has a team of more than ten that provides custom software development, digital strategy, IoT development, web development, BI & big data consulting & SI, and SEO services. Imobisoft serves midmarket and other-sized companies in the medical, manufacturing, utilities, energy & natural resources, financial services, ane e-commerce industries. 

    Clients

    • NHS (Multiple divisions)
    • BSkyB
    • E-Energy
    • Northern Gas Networks

    Industries

    Notable Project

    An energy supplier hired Imobisoft to provide web and app development. Their efforts also include UI/UX design for a platform that allows salespeople to streamline their processes.

    "Imobisoft developed a web and mobile app using .NET  technologies. The application allows us to bring on thousands of new customers . Without the software they created for us, we wouldn’t be generating sales. We're very satisfied with the design and the application, and it couldn’t be better".

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  • 57
    • Scheduling

      4.9
    • Quality

      4.9
    • Cost

      4.9
    • NPS

      4.9
    Read Full Reviews on Clutch Visit Site
    • $50,000+
    • 2 - 9 employees
    • London, United Kingdom

    Digiruu is a digital firm founded in 2016 run by a team of fewer than 10 professionals. Based in London, the company lends their expertise in mobile app development, UX/UI design, and web design to clients ranging from startups to large enterprises, working in various industries such as consumer products, advertising, and media.

    Clients

    • Pretty Lavish
    • ByErim
    • The Climate Week NYC
    • Subconsciously

    Industries

    Notable Project

    A freelance writer hired Digiruu to resolve the issue on their website. The client worked directly with the founder of the vendor’s company on this project.

    "I really liked working with Aman — he was great, efficient, and committed."

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  • 58
    • Scheduling

      5.0
    • Quality

      5.0
    • Cost

      5.0
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • Undisclosed
    • 10 - 49 employees
    • London, United Kingdom

    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.

    Clients

    • The Lowdown
    • Hero
    • Packet AI
    • Myster

    Industries

    Notable Project

    An AIOps solution provider works with Tilde Loop for custom software development focused on the front end and UI/UX.  

    "It's very rare to see such a professional IT services company."

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  • 59
    • Scheduling

      4.7
    • Quality

      4.7
    • Cost

      4.3
    • NPS

      4.7
    Read Full Reviews on Clutch Visit Site
    • $25,000+
    • 10 - 49 employees
    • London, United Kingdom

    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.
     

    Clients

    • Admiral
    • Veygo an Admiral company
    • BNP Paribus
    • MADE.com

    Industries

    Notable Project

    Theodo (previously Theodo UK) created additional functionality for an existing website for a property management company. They built landing pages, a new user onboarding flow, and other features for a better user experience.

    "Theodo kicked off our project with little need for onboarding and executed our goals quickly."

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  • 60
    • Scheduling

      5.0
    • Quality

      4.5
    • Cost

      3.5
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $25,000+
    • 50 - 249 employees
    • London, United Kingdom

    Lola Tech is a London, United Kingdom-based website development firm. The midsize company was founded in 2009. Their services include web development, ux/ui design, architectural design, AR/VR development, and more.

    Industries

    Notable Project

    Lola Tech was hired by an airline company to support their development capabilities. The team handled the projects' architecture development, UI/UX design, and front- and backend software development.

    "By working with Lola Tech, we were able to achieve exactly what we set out to accomplish."

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