Top 100 JavaScript Development Companies in London
December 2023Looking 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
- $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.
Clients
- ClassPass
- ZEFR
- Gain Capital (forex.com)
- Merkle
Industries
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Vention provides staff augmentation services to a SaaS solutions provider. The scope includes software and feature development and maintenance across the product line.
"They are all developers capable of delivering their responsibilities."
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2
- $10,000+
- 50 - 249 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.
Clients
- FieldBI
- AutoBI
- AgroTop
Industries
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A virtual care management company hired Softblues to build a web-based texting platform and integrate it with a registered Twilio number. The tool provided resources depending on users' survey responses.
"They were very kind people and a pleasure to work with."
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3
- $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.
Clients
- Nokia
- Sage
- Ernst & Young
- BNP Paribas
Industries
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Imaginary Cloud provided staff augmentation services for an industrial IoT solutions company. They supported the internal team to develop a React Native mobile app and helped with user stories design and tech.
"We were impressed by their experienced team members."
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4
- $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.
Clients
- Pfizer
- BrokerIQ
- Ultra
- Gaming Engage
Industries
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Light IT Global developed new features for a technology company's product, including an OKR management system and an HR management system, using Python and React. Their work included QA and project management.
"They not only accepted our requests but actively warned us about the problems and risks they saw on their side."
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5
- $10,000+
- 10 - 49 employees
- London, United Kingdom
Marzee Labs is a web development company that has been offering web design, web development, ad e-commerce development services to their clients since 2013. Their 10 employees are based out of their Porto, Barcelona, London, and Setúbal, Portugal offices.
Clients
- ARTE
- BEN Group
- Impulso
Industries
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Marzee has provided e-commerce development services for a fantasy sports platform. They have developed the client's NFT marketplace, the home page, and related drop mechanics features.
"They are really good at responding to the client's needs and flexible enough to adapt to new scenarios and needs."
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6
- $10,000+
- 50 - 249 employees
- London, United Kingdom
Tech Alchemy was founded in 2016 and has two locations in London. Their team of nearly ten employees provides web development, mobile app development, and UX/UI design services for small businesses.
Clients
- Ocean Bottle
- TOAD
- MyBricks
- Moviecoin
Industries
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A gaming company has hired Tech Alchemy for game development. Their work includes P2E Web3 development, gaming app creation, and blockchain integration.
''Tech Alchemy had a great proactive scope and roadmap planning where realistic goals were set. ''
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7
- $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.
Clients
- Philips
- Nike
- Porsche
- Coca Cola
Industries
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Infinum designed and developed an application for a fixtures installation company. Infinum created an internal app for the client's company with work management, tracking, invoicing, and billing capabilities.
"I was impressed with the openness of the company personnel to want to help us succeed."
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8
- $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.
Clients
- Jumia
- Careem
- Khatabook
- Geidea
Industries
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Blink22 helps a subscription-based digital library with product management. They've implemented a machine learning book recommendation engine, made UI/UX enhancements, and designed emails and landing pages.
"They were really good at adjusting to our different needs."
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9
- $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
- Singleton Law Firm (USA)
- EFQM (Global)
- HRC International (Netherlands)
- Userlane (Germany)
Industries
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A digital marketing firm hired Agile Digital Agency to develop an HTML-based microsite for their app. The team mainly utilized JSON and JavaScript to implement gameplay functionalities.
"The whole engagement was excellent."
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10
- $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.
Clients
- Samsung
- Johnson & Johnson
- GlobePayroll
- Siemens
Industries
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A ride-hailing company has hired Andersen Inc. to develop two new financial products. The team is responsible for front- and backend development, integrations, testing, and analytics set-up.
"The team is highly flexible and responsive to any business need in no time."
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11
- $25,000+
- 50 - 249 employees
- Croydon, United Kingdom
Founded in 2005 and headquartered in Croydon, UK, GoodCore Software specializes in bespoke software development. WIth a team of about 50 employees, the company offers web and mobile app development to startups and established businesses alike. Engagement options include fixed- cost and dedicated development teams.
Clients
- Printed Music Licensing
- Weight Loss Resources
- GC Business Finance
- XTracked Deliveries
Industries
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GoodCore developed a SaaS application for managing briefing programs and events for Fortune 100 companies. The team coded in React and Laravel for creating a web-based application. The application helped automate and streamline the management of corporate events, briefing programs and meetings.
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12
- $75,000+
- 50 - 249 employees
- London, United Kingdom
Founded in 2007, hedgehog lab is a global software consultancy of 200+ that specializes in multi-platform software and device innovation. Headquartered in London with six offices across three continents, their team architects, designs, and develops app solutions that prepare brands for the future of post-PC devices.
Clients
- Aviva
- AJ Bell
- LaserShip
- Santander
Industries
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hedgehog lab works on app development for Android and iOS for an InsurTech company. They’ve built a software development kit for the client’s mobile technology using JavaScript, Kotlin, Swift, and Objective-C.
“hedgehog lab invests time and effort into our products and creates greater opportunities for us to explore together.”
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13
- $25,000+
- 10 - 49 employees
- London, United Kingdom
Founded in 2018, Together is a creative agency. Their team of around 10 employees is based in London. They focus on web development and design and branding.
Clients
- Mosaic
- SeedLegals
- Amazon
- Coast
Industries
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A fintech company hired Together for a brand redesign. Deliverables included a new logo, color scheme, and new sales collateral. Together also designed and developed the client’s Webflow website.
“They have some of the best designers we’ve ever worked with.”
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14
- $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.
Clients
- Mercedes-AMG
- CSC Group
- Fazwaz
- Rad Golf
Industries
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Webskitters LTD was hired by an e-bike subscription company for e-commerce development services. They customized a Shopify store for the client's business.
"The timely and accurate development impressed us."
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15
- $10,000+
- 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.
Clients
- Contec Inc
- WFS Global
- Alrec
- Sony
Industries
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Valiant Design provided digital marketing services for an electrical components company. The team assisted the client in regard to their product launch marketing communications.
"I was most pleased with their high level of expertise and professional communication."
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16
- $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.
Clients
- ARM INC
- Vonage
- British Council
- BBC
Industries
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Innovify was hired by a software development company for app and website development services. The team ensured that both the app and website were seamlessly integrated across different platforms.
"Their technical expertise and ability to understand our goal were outstanding."
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17
- $50,000+
- 50 - 249 employees
- London, United Kingdom
Supercharge is a digital production firm that is headquartered in Budapest, Hungary with a second office in London. Founded in 2010, Supercharge's team of more than 100 employees specializes in web and mobile app development. The firm also offers UI/UX design services to its clients.
Industries
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Supercharged developed an Apple Watch app for a medical device company to use for demos, PR, and media purposes. The team worked with Apple’s tech stack and the watchOS to develop the product’s demo features.
“Supercharge is a partner you can trust.”
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18
- $50,000+
- 50 - 249 employees
- London, United Kingdom
Founded in 2010, Magora is a 50+ team of web and mobile app designers and developers based in London. Whether it’s B2B or B2C, the firm creates bespoke software that integrates with existing business solutions to enable user-centered interaction and scalable software architecture.
Clients
- Danone
- Unilever
- Toyota
- Royal College of Art
Industries
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Magora has developed a web app for a video production company. The team has worked on building new features for the platform and has handled everything from wireframing and design to JavaScript development.
“They’re accessible, and it doesn’t feel like I’m working with a faceless team.”
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19
- $5,000+
- 10 - 49 employees
- London, United Kingdom
OSOM Studio is an interactive online solutions provider founded in 2011, based in Lodz, Poland, with an office in Warsaw, Poland. Their team of 15 employees provides web development, UX/UI design, and e-commerce development services to small, midmarket, and enterprise businesses alike.
Clients
- IKEA
- Capgemini
- Vivitek
- OECD
Industries
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Osom Studio designed a website for a software company. The site was built for WordPress, using various page formats. The team included videos, images, and case studies and enabled the site to be customized.
"All teammates were responsive, and a good communication flow made it easy to adjust our goals throughout the project."
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20
- $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.
Industries
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Hiyield developed a digital built asset consultancy's website to help them increase their brand awareness and stand out. This involved outlining deliverables, creating mock-ups, and developing wireframes.
"The whole interaction with them was a pleasurable experience"
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21
- $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.
Clients
- Kopona
- Brain.Health
- CityMunch
- Altus Investment Management Ltd
Industries
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Old.St Labs optimized the desktop booking tool of a transportation solutions company to make it mobile-responsive. Their work included revamping the customer journey from scratch and integrating several APIs.
"The team planned the project thoroughly."
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22
- $25,000+
- 250 - 999 employees
- London, United Kingdom
Altkom Software & Consulting, founded in 1998, is a software development company headquartered in Warsaw, Poland, with an additional office in Krakow, Poland. They specialize in custom software development, web development, and application management & support. The company has 130+ employees who work with enterprise, mid-market, and small businesses. The businesses they serve are mostly in the financial services industry.
Clients
- BNP Paribas
- AXA Insurance
- Santander
- Danone
Industries
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Volvo has hired Altkom Software & Consulting to digitize and automate their sales processes. The team is also responsible for developing dealer web pages and designing their UI/UX for the client.
"I was most impressed with their involvement in the project and team communication skills."
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23
- $10,000+
- 50 - 249 employees
- London, United Kingdom
Powercode is a web development agency based in Kyiv, Ukraine founded in 2015. They are operated by a team of 66 who are experts in web, mobile app, and custom software development for clients ranging from startups to enterprises. They have experience working in industries such as financial services, business services, and IT. They are also familiar with working with platforms like Amazon, Linux servers, and Azure, among others.
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Powercode developed websites for a nonprofit organization's customers. They also handled CRM integration into the email system.
"Their open and transparent communication and a keen eye for detail took away all my worries."
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24
- $10,000+
- 250 - 999 employees
- London, United Kingdom
TkXel is a mobile app and web development company founded in 2007. With its headquarters in Reston, Va., and an office in Lahore, Pakistan, they have a team of 318 employees. Their services include mobile app development, web development, and custom software development. They primarily serve small and midmarket clients.
Clients
- ABB
- Nokia
- Groupon
- TELUS
Industries
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Tkxel has helped a software consulting and development company streamline and optimize their processes and integrate data seamlessly. The team has also worked on enhancing the client's customer interactions.
"I'm impressed with their solutions."
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25
- $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.
Clients
- International Tennis Federation
- Leicester Tigers
- Northampton Saints
- Wall Street Journal
Industries
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Clock Limited designed and developed a website and mobile app for a subscription service company. The goal was to increase membership engagement and growth.
"The process was incredibly smooth. The entire team was very prepared at all times."
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26
- $50,000+
- 10 - 49 employees
- London, United Kingdom
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
- Togetherall
- Lick
- MyTrees
- Bulb
Industries
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NEVERBLAND developed and designed a website for a healthcare company. The team reviewed the client's current website, created wireframes, designed the UI/UX, and set up a CMS and frontend technologies.
"They adapted to our change of scope throughout and ensured all deadlines were met."
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27
- $5,000+
- 10 - 49 employees
- London, United Kingdom
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
- Mercer
- Legal & General
- Utility Warehouse
Industries
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A land mapping business hired Plug & Play to design their mobile application using Adobe. They assisted the client with narrowing down the scope of the project before presenting and implementing the designs.
“Overall, we had a very positive experience working with them.”
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28
- $10,000+
- 50 - 249 employees
- London, United Kingdom
Influential Software is a software development firm in London, United Kingdom; Maidstone, United Kingdom and Glasgow, United Kingdom. The firm focuses on custom software development, web development, BI & big data consulting & SI, IT managed services, and more and has a midsize team.The firm was launched in 1993.
Clients
- Deloitte
- American Express
- London Stock Exchange
- Pret a Manger
Industries
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Influential Software has been hired by a healthcare training center to replace their legacy systems with more bespoke ones. The team has provided a tailored solution using .NET and a portal framework.
"We are so impressed with the quality of work that was done."
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29
- $10,000+
- 10 - 49 employees
- London, United Kingdom
Signifly is a digital design and development agency headquartered in Montreal, Canada, with an office in Copenhagen. Since 2010, their team of about 30 has expertise in digital strategy, UX/UI design, and e-commerce development.
Clients
- BMO - Bank of Montreal
- Diva Cup
- GE Current
Industries
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A B2B business hired Signifly to design and develop a new website. The team also created a new brand identity, along with a new brand guidelines, for the client.
“I’m in love with Signifly’s team.”
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30
- $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.
Clients
- OnlyFans
- Play HQ
- University of Melbourne
- Expedo
Industries
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Uinno provides development services for an HR solution company. They've worked on the client's front- and backend tasks using the .NET technology. Other key technologies include React.js, TypeScript, and Azure.
"They always see the big picture while approaching the task pool and, thus, find the best possible solution."
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