Top 100 JavaScript Development Companies in London

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Top 100 JavaScript Development Companies in London

May 2022

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

    Headquartered in New York, iTechArt is a custom software development company with additional offices in Marietta, Ga. and Iselin, N.J. Since 2002, iTechArt 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, iTechArt’s talent pool includes 3500+ engineers with experience in all of the latest technologies.

    Clients

    • ClassPass
    • ZEFR
    • Gain Capital (forex.com)
    • Merkle

    Industries

    Notable Project

    iTechArt Group is augmenting a pet food company’s development team. They work on several projects independently and with internal developers using Python, Vue.js, and Nuxt.js. 

    "They deliver strong code quality, high test coverage, and brilliant architectural design."

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  • 2
    • Scheduling

      5.0
    • Quality

      5.0
    • Cost

      4.9
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $5,000+
    • 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

    • Pinterest
    • FieldBI
    • AutoBI
    • AgroTop

    Industries

    Notable Project

    Softblue developed an agricultural company’s WordPress website. The site had a custom design and unique marketing features. They also built an e-commerce platform. 

    "The Softblues team was very proactive."

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  • 3
    • Scheduling

      4.9
    • Quality

      5.0
    • Cost

      4.9
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $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

    Notable Project

    A B2B software company partnered with Tech Alchemy in order to develop a custom web app that will allow them to trigger and multi-sign blockchain transactions. 

    "We appreciated their experience working with startups to help them succeed in the long run."

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  • 4
    • $10,000+
    • 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

    Notable Project

    Andersen designed the UI/UX for a digital therapeutics company's application. They conducted initial research, evaluated existing wireframes, and delivered UX prototypes.

    "They established clear deliverable timelines and stayed on point."

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  • 5
    • $50,000+
    • 250 - 999 employees
    • London, United Kingdom

    DCSL GuideSmiths is a bespoke software development company headquartered in Farnborough, England with additional engineering centers in London, Manchester, England, and Madrid, Spain. Across international locations, they have a team of more than 250 individuals providing custom software, mobile application, and web development services to a diverse clientele. They support established businesses, nonprofits, government organizations, and startups

    Clients

    • Mitsubishi
    • Hospify
    • Skanska
    • Water Aid

    Industries

    Notable Project

    A real estate investment company hired DCSL GuideSmiths to provide customer portal development. They use different technologies to write the site's new iteration, develop the frontend, and host the software.

    "Their team has enabled us to get through the rough patches we’ve faced with our project."

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  • 6
    • $1,000+
    • 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

    Notable Project

    Imaginary Cloud developed an interactive website for a online awareness initiative. The original site was built on React powered by data residing in Google Sheets.

    "The people at Imaginary Cloud were both professional and organized."

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  • 7
    • Scheduling

      4.6
    • Quality

      4.8
    • Cost

      4.6
    • NPS

      4.9
    Read Full Reviews on Clutch Visit Site
    • $25,000+
    • 50 - 249 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

    Notable Project

    Infinum provides mobile app development services for a bank. Their team built an Android and iOS app from scratch. Now, they handle maintenance and updates as well as resolve any issues that may arise.

    “Infinum has a young responsive team that’s well-equipped for what it does.”

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  • 8
    • $25,000+
    • 10 - 49 employees
    • London, United Kingdom

    ProductCrafters is a software development company based in Khmelnitsky, Ukraine. Their team of fewer than 10 employees provides custom software, web, and mobile app development services. The company was founded in 2016.

    Clients

    • BeautyAdvisor
    • Raisal
    • ProcessBoard
    • LTC Consulting

    Industries

    Notable Project

    ProductCrafters was hired to build a web and mobile-optimized family recipe sharing app. The team also provides consultation services and utilizes React and PostgreSQL for the front- and backend development.

    "After having one conversation with them, I instantly knew they were going to be the best partner for this project."

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  • 9
    • Scheduling

      4.9
    • Quality

      4.8
    • Cost

      4.8
    • NPS

      4.9
    Read Full Reviews on Clutch Visit Site
    • $25,000+
    • 50 - 249 employees
    • London, United Kingdom

    Propeller is a web design and development company that was founded in 2000. Headquartered in London, with another office in New York, they have a team of over 55. They specialize in e-commerce development, email marketing, web design, and SEO or clients in the hospitality, leisure, consumer products, and retail industries.

    Clients

    • Azzuri Restaurant Group
    • Twinings
    • Young's Pubs
    • MWELL - Kellogg's

    Industries

    Notable Project

    Propeller provides ongoing web design and development services for a high-end dental practice. Their team has designed and developed four websites over the course of the 13-year engagement. 

    “Propeller has been absolutely amazing; they really understand the brief.”

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  • 10
    • Scheduling

      4.7
    • Quality

      4.9
    • Cost

      4.8
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $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

    Notable Project

    Together developed an advertising company’s website. The team redesigned the firm’s visual identity and implemented their designs on the firm’s marketing materials. They also created bespoke animations on site.

    “The team was spot on in terms of capability, trustworthiness, and execution."

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  • 11
    • $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.

    Clients

    • DoctorLink
    • AllPlants
    • ProperCorn
    • Kano

    Industries

    Notable Project

    Thought&Function developed iOS and Android mobile applications using React Native. They spearheaded the project, from wireframes to deployment, including working with the app stores on submission. 

    "They went the extra mile without necessarily billing me for every single piece of advice." 

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  • 12
    • $10,000+
    • 10 - 49 employees
    • London, United Kingdom

    Ester Digital is a web design agency based in Tallinn, Estonia. Founded in 2015, the team of 7 specializes in web design, graphic design, and logos. They work mostly with small business clients, and primarily work within the advertising and marketing, information technology, and business services industries.

    Clients

    • Toptal
    • McDonald's
    • Bridgestone
    • T-Mobile

    Industries

    Notable Project

    An integrated service platform initially wanted to implement an add languages option to their current website. They engaged with Ester Digital for the project, but included adding a drop-down menu as well.

    "Their knowledge, patience, and quick communication were all impressive."

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  • 13
    • $25,000+
    • 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

    Notable Project

    A media company wanted to develop a website to manage their loyalty program and increase engagement. They chose to partner with Clock Limited after getting several recommendations about the vendor's work.

    "Clock's project management style is exceptional."

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  • 14
    • Scheduling

      4.5
    • Quality

      4.8
    • Cost

      4.5
    • NPS

      4.7
    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 upgraded and rewrote two existing apps for a health and safety software company. They developed upgrades for APIs, added new functionality, and more.

    "For any urgent issues we were able to contact them quickly."

    Visit Site
  • 15
    • Scheduling

      4.9
    • Quality

      4.9
    • Cost

      4.8
    • NPS

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

    Freshcode is a software development company from Zaporizhzhya, Ukraine. Since it was founded in 2014, the team has since grown to about 47 employees. Freshcode offers custom software, web, and mobile app development mostly for small and mid-size companies. 

    Clients

    • tchop
    • Huddle
    • KPMG

    Industries

    Notable Project

    Freshcode developed a web application for a Certificate of Rent Paid (CRP)-issuing company. The platform would automatically generate CRP forms for landlords, saving time and effort.

    "I was impressed at how they can adapt and refine a product into a best-case scenario when situations change."

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  • 16
    • Scheduling

      4.7
    • Quality

      4.9
    • Cost

      4.7
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $10,000+
    • 50 - 249 employees
    • London, United Kingdom

    Code&Care is a full-stack software development company based in Austin, Texas, and founded in 2015. With over 50 employees, they offer web development, IT staff augmentation, and mobile app development solutions to small and mid-market agencies alike.

    Clients

    • BITFINEX
    • Roofstreet
    • FrandMe
    • RealConnex

    Industries

    Notable Project

    Code&Care provides technical outsourcing for a fintech company. They've sent over 10 resources for the client's internal development teams.

    "We're impressed with the quality and consistency of the staff they provide."

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  • 17
    • $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 created a simple software platform for a supply chain transparency firm. The client worked with a UI/UX specialist and a senior web developer to build the prototype. 

    "They were highly involved and engaging. We also came up with some good ideas for how to present information together."

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  • 18
    • Scheduling

      4.7
    • Quality

      4.8
    • Cost

      4.4
    • NPS

      4.8
    Read Full Reviews on Clutch Visit Site
    • $75,000+
    • 50 - 249 employees
    • London, United Kingdom

    With a team of 50+, Fueled specializes in creating mobile apps and websites. The New York-based app development company aims to create easy-to-use and attractive products for customers, whether they are big or small brands.

    Clients

    • MGM Resorts International
    • 9Gag
    • Harvard
    • Rite Aid

    Industries

    Notable Project

    Fueled is working for an EdTech company to build a mobile app that includes a CMS, a parent portal, and gamified lessons. They have developed the app using Flutter and have performed testing sprints.

    "Overall, our engagement with Fueled has been very positive."

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  • 19
    • 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 developed an e-commerce website for a cab comparison company. The team fixed and enhanced the UI flow of the site, working in Node and React for development. 

    "They are good developers and architects who pay close attention to detail."

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  • 20
    • Scheduling

      4.7
    • Quality

      4.7
    • Cost

      4.6
    • NPS

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

    Tivix is a digital product development and design company headquartered in San Francisco, with offices across the US, UK, and Europe. Founded in 2008, they have over 90 employees who serve startup, midmarket, and enterprise clients across diverse industries such as FinTech, health care, manufacturing, government, and nonprofit. Tivix reduces engineering risk for clients by offering rapid time-to-market while delivering standards-based code that can be transitioned to an internal team at any time. Their focus is building both internal and consumer-facing digital products that drive business growth. Services include product management, UX/UI design, full-stack software engineering, and DevOps

    Clients

    • NATO
    • Apple
    • United Nations
    • Zoetis

    Industries

    Notable Project

    Tivix supported a software development project’s design phase for a device testing company. They mapped out requirements, gathered user stories, and produced data structures.

    "They were always on top of the engagement’s progress, and they always checked our availability."

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  • 21
    • Scheduling

      4.6
    • Quality

      4.8
    • Cost

      4.6
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $100,000+
    • 50 - 249 employees
    • London, United Kingdom

    Myplanet is a software studio headquartered in Toronto, Ontario, with additional offices in Vancouver, British Columbia, and Chicago, Ill. Founded in 2009, Myplanet's team of around 90 specializes in web development, web design, and e-commerce development, primarily for midmarket and enterprise clients in financial services and media.  

    Clients

    • Acquia
    • CenturyLink
    • Cisco
    • Cleveland Clinic

    Industries

    Notable Project

    A cloud platform developer hired Myplanet for assistance with digital strategy, information architecture, and user experience. The client's goal was to rebrand and reposition its digital presence as it moved away from providing hardware to providing cloud services. The client appreciated Myplanet's "customer-centric" approach to project management.

    "From day one to January 2015, we experienced a 300% increase in site traffic and 200% increase in leads coming from the web. Our bounce rate went down and our net promoter score went up." - Chief Marketing Officer & SVP of Business Operations, Cloud Platform Developer 

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  • 22
    • Scheduling

      4.6
    • Quality

      4.5
    • 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

    Notable Project

    Catch refurbished the website of an investment management company to improve their online presence. They've used Figma to rebuild the UX, upgraded the system to Drupal 9, and hosted the site via Acquia and AWS.

    "We’re most impressed with their team’s adaptability — they work within our schedules and stick to our project scope."

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  • 23
    • $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 provided custom software development services for a creative and design agency. Their team handled frontend development of a web solution utilizing Laravel and React.

    “They’re very collaborative. Purr Digital was open to feedback.”

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  • 24
    • $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 is developing a youth marketing agency’s app. They’ve taken over from the in-house team that started the project. The app generates reports and is available on Android, iOS, and the web.

    "Intellectsoft’s communication is very efficient and clear."

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  • 25
    • 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 developed a custom website for an independent creative agency. The team built the brochure site as well as an e-commerce platform.

    "They are transparent and approachable."

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  • 26
    • Scheduling

      4.2
    • Quality

      4.7
    • Cost

      4.3
    • NPS

      4.8
    Read Full Reviews on Clutch Visit Site
    • $10,000+
    • 50 - 249 employees
    • London, United Kingdom

    CTI Digital is a full-service digital agency from Manchester, UK with other offices in London and Stockport, UK. The agency was established in 2003 and now has a team of 68 that works on web development, e-commerce development, mobile app development, and UX/UI design.

    Clients

    • Greater London Authority
    • Merlin Entertainments
    • Little Greene Paint
    • Body Building Warehouse

    Industries

    Notable Project

    A government contractor previously had a website that was managed by one company and whose servers were hosted by another. They chose to consolidate all their website work at CTI Digital, who now hosts their servers, provides Drupal development, and updates the website and CRM.

    "The support is really great. The team that deals with support is absolutely brilliant...We have a very good two-way working relationship." — Project Manager, Government Contractor

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  • 27
    • 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

    A real estate brokerage hired Geeks Ltd for custom software development services. The team handled the client's intranet support services, CRM, document processing, and mobile optimization.

    "We were impressed by their knowledge, communication style, and professionalism."

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  • 28
    • Scheduling

      4.9
    • Quality

      4.9
    • Cost

      4.9
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $10,000+
    • 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

    A personal training company enlisted SoBold to design, develop, and launch their company website. The goal was to increase brand awareness and gain lead generation that would turn into conversions. The results of the project were positive; the client gained new customers and this outweighs the cost of the project.

    “The ease of communication and speed of execution were impressive. They had a low turn around time in tasks requested.” — Co-Founder & Director, Personal Training Company

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  • 29
    • Scheduling

      4.7
    • Quality

      5.0
    • Cost

      4.4
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $10,000+
    • 50 - 249 employees
    • London, United Kingdom

    Founded in 2007, MassMedia Group is a software development firm that offers custom software development, web development, CRM consultation, and SI to their small business, mid-market, and enterprise clients in the legal, financial, and business services industries. Their 250 employees are based out of Khmel'nyts'kyi, Ukraine.

    Clients

    • sket.io
    • Greek Capital Management
    • Pentroy

    Industries

    Notable Project

    Snotor (formerly MassMedia Group) did development as part of a partnership with a SaaS platform. Services included frontend and backend development, integrating external APIs, and defining user stories.

    "There’s genuine confidence that they have my back."

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  • 30
    • 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."

    Visit Site

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