Looking for a top JavaScript developer in the United Kingdom?

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 United Kingdom. Browse descriptions, feedback, and awards to find which can best suit your company’s needs. If you need more support, tell us about your project, and we'll match you with recommended companies.

List of the Best United Kingdom JavaScript Developers

  • 1
    $50,000+
    50 - 249 Employees
    Matlock United Kingdom

    Human Made is a global enterprise WordPress firm founded in 2010. The company is headquartered in New York City and has additional locations in Matlock, UK and Brisbane, Australia. Human Made employs a team of 56 that provides web development, custom software development, web design, and more to mainly large and mid-size clients.

    Clients
    ABC
    News Corp
    TechCrunch
    Skype
    Notable Project

    An investment management firm was looking for a developer for build a high-end WordPress site that could handle high volume traffic. Human Made developed a robust back end, consultation, and testing services on a tight timeline. The site is also scalable and able to handle millions of monthly users. 

    "They do a very good job of meeting their estimations....For companies like ours, I would be more than happy to refer them." - CEO, Investment Management Firm 

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  • 2
    $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 1600+ engineers with experience in all of the latest technologies.

    Clients
    ClassPass
    ZEFR
    Gain Capital (forex.com)
    Merkle
    Industries
    Notable Project

    iTechArt Group is assisting with the development of a content management software for video advertisements. The team is building the system to accommodate multiple social media platforms like YouTube and Facebook.

    “The engagement has been very successful overall thus far. The work we've been able to quickly launch wouldn't have been possible without iTechArt's help. In addition to the quality of their code, they've also integrated extremely well into our team, adapting to our internal processes relatively seamlessly.” – Founder & CTO, Software Consulting Agency

  • 3
    $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
    Notable Project

    DCSL GuideSmiths redeveloped the recruitment software system of a construction firm. After laying out their requirements, DCSL GuideSmiths designed, tested, and delivered on the system. The client was pleased with the project and felt that DCSL GuideSmiths' skills made the collaboration extremely easy. 

    "We were able to see straightaway how the system would look and work. That’s another reason it went so smoothly." – Manager, Support Department, Construction Firm

  • 4
    $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 worked with an intergovernmental military alliance to rebuild a mission-critical software system. If and when submarines in international waters come into distress, the organization plans and coordinates the rescue effort of such submarines. Tivix was given complex system requirements and asked to come up with an effective design and solution that would replace a decades-old system. The client was incredibly impressed at every stage of the engagement, with Tivix delivering detailed systems and user-experience design, followed by robust development and operationalization of the system internationally. 

    Every single milestone has been met exactly on time. The company has met every requirement, both in terms of time as well as quality.” Maritime Service Owner, Intergovernmental Military Alliance

  • 5
    $100,000+
    50 - 249 Employees
    Edinburgh United Kingdom

    xDesign is a design and development company in Edinburgh, U.K. Founded in 2010, their team of 50+ provides web development and mobile app development services to small business, midmarket, and enterprise clients across various industries. 

    Clients
    PayPal
    Heineken
    World Health Organization
    William Grant & Sons
    Industries
    Notable Project

    xDesign developed to help a modular building manufacturer better monitor its product delivery. The client mapped out its goals, from which they designed wireframes, prototyped, and ultimately delivered the app. The client was impressed with their ability to understand the project goals and provide input to improve the product. 

    "They picked up our business process very very quickly and they were very good at pointing out things they thought might be better." – IT & Digital Manager, Modular Building Manufacturer

  • 6
    $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

    Clock Limited redesigned a website for a news and media outlet. The team also built a custom CMS for the client. The site forms the foundation of the internal team's business.

    "The CMS is fantastic and they have been very receptive to our ideas, no matter how big or small." – Site Editor, News Outlet

  • 7
    $50,000+
    50 - 249 Employees
    Bristol United Kingdom

    Torchbox is a web design agency launched in 2000. The firm focuses on web design, web development, ux/ui design, pay per click, and more and has a midsize team.

    Industries
    Notable Project

    Torchbox conducted in-depth user research for an education department. They performed several stakeholders, users, and potential user interviews to identify and understand the needed improvements for a website. 

    "Most impressive was how Torchbox understood our brief perfectly in a short period of time."

  • 8
    $25,000+
    250 - 999 Employees
    Belfast United Kingdom

    Founded in 2009, Unosquare, LLC is headquartered in Lake Oswego, Ore. with other locations in Guadalajara, Mexico, and Belfast, U.K. With more than 600 employees, they provide software testing and development services, combined with their staff augmentation services to meet software engineering needs, using nearshore development professionals.

    Clients
    Vesta
    Harvard Business Publishing
    Foundation Medicine
    Edwards Lifesciences
    Industries
    Notable Project

    A caller ID company hired Unosquare, LLC to provide software engineering and QA resources. Assisting on various projects, Unosquare provided daily support in all aspects of application development.

    "I have been most impressed with the caliber of the technical resources provided by Unosquare." – Senior Director Software Engineering, Caller ID Company

  • 9
    $10,000+
    10 - 49 Employees
    Edinburgh United Kingdom

    GearedApp is a software development firm based in Edinburgh, Scotland. They were founded in 2013 and have a team of 11 employees who specialize in mobile development, web development, and UX/UI design. They work mostly with small business clients in the healthcare, business services, and education industries.

    Clients
    NHS
    Edinburgh University
    AWDis
    HR Solver
    Industries
    Notable Project

    GearedApp developed apps for a poultry breeding company. The client needed three different apps for its separate global brands. GearedApp took over from another developer and added several new functionalities, improving the design of the apps and decreasing their download times. The client was impressed by the improvements that were made to the product and the speed with which they were implemented.

    “They’ve improved both the apps’ design and functionality and dramatically reduced their download time.” – Assistant Marketing Manager  

  • 10
    $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 rebuilt a flight booking app for a startup. The original app was extremely buggy and the company needed further support. One feature Infinum developed allowed customers to sync their calendars to find flights that work around their schedule.

    “While many agencies limit your choices, it was quite different with Infinum. They were clear and upfront about what resources we were getting and why and offered us options, which was really nice.” – Senior Project Manager, App Startup

  • 11
    $25,000+
    50 - 249 Employees
    Manchester United Kingdom

    Digiryte is a web and mobile app development company based in Manchester, United Kingdom with another UK office in Preston. Since 2015, their team of 28 has been specializing in mobile app development, custom software development, and web development for midmarket clients. 

    Clients
    NHS
    Channel 4
    Close Brothers
    Hinch Property Management
    Industries
    Notable Project

    A beauty salon hired Digiryte for their digital development services. The agency developed a customized software that included automated billing, customer reviews, and more. The software is easy to use and has brought in new customers. 

    "I’ve shown my website to a few people, and they’re all impressed. I can use the software with ease, and it captures all the data that I wanted. People come to the salon after seeing the look and feel of the webs."–VP Technology, Beauty Salon

  • 12
    $5,000+
    50 - 249 Employees
    Manchester United Kingdom

    Groovy The Web Firm is a web design and digital marketing company headquartered in Nadiad, India. It was founded in 2015 and has 14 employees. They offer custom software development, mobile app development, and web development services. They mainly serve midmarket and small business clients in the IT, health care & medicine, and e-commerce sectors.  

    Clients
    MyCribBooking Malaysia
    XtraRecharge India
    BuyandSellOffers USA
    Pipeline Management Australia
    Industries
    Notable Project

    Groovy built a data management system to track pipeline construction for a software development consulting company. The system was accessible on the web and both iOS and Android devices, which improved efficiency and increased the speed and quality of the system. The client was grateful for their organization and ability to provide high-quality results.

    “Their ability to deliver high-quality work promptly is their main strength. Their understanding of complex requirements—especially when revisiting defects after a long period—was excellent.” –Operations Manager, Software Development Consulting Company

  • 13
    $10,000+
    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 developed and designed a creative website for a photography studio. The team also performed digital marketing services, crafting keywords. SEO campaigns improved search results and mobile usage.

    "Propeller created a platform that represents me, my taste and artistic level."– Founder, Photography Studio

  • 14
    $10,000+
    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 an app for a personal finance company. The app was built entirely from scratch using React Native for both Android and iOS platforms. The app was released earlier than scheduled.

    “For me, what sets them apart is the relationship.” - Founder, Personal Finance Company

  • 15
    $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 designed a bidding-style app for a company that deals with nightlife reservations. They built the app from scratch, taking into consideration what the company wanted, as well as giving advice. The app had a lot of functions, such as a list of venues, submission options, and tools that allowed notifications to be sent from venues.

    “They’re incredibly efficient in the work that they do and know what they're doing in design, coding, and executing their ideas. They have a great understanding of what's current and get things done very quickly compared to others.” – Founder, Mobile App

  • 16
    $50,000+
    50 - 249 Employees
    Hertford United Kingdom

    Zoocha is a web development firm founded in 2009 and headquartered in Hertford, in the U.K. The firm has other locations in Valencia, Spain; Balneário Camboriú, Brazil; and New York, N.Y. Zoocha has about 30 employees. 

    Clients
    Westminster City Council
    Financial Conduct Authority
    Ofsted
    Topdeck Travel (part of Flight Centre Travel Group)
    Industries
    Notable Project

    Zoocha created a web application for a UK oil and gas energy network. Using Drupal extensions and PHP scripting, Zoocha made an interactive platform for tracking and storing information. The client was impressed with Zoocha's work.

    "The refresh that we did with Zoocha Ltd has increased business value by three times, and in some areas, it’s about six times. We haven’t had any bugs or crashes." - CEO, UK Energy Service Firm

  • 17
    $10,000+
    10 - 49 Employees
    Brighton United Kingdom

    DabApps is a web and mobile application development agency based in Brighton, England. They were founded in 2010 and have a staff of 21 employees. They specialize in custom software, web, and mobile app development for primarily small business clients in the business services, consumer products, and education industries.

    Clients
    LOD
    One Research
    FUTRLI
    Brighton Fringe
    Industries
    Notable Project

    DabApps built an app for an illustration agency. They created apps for Android and iOS that fit the client's specifications and incorporated their visuals, artwork, and custom emojis. The client was very satisfied with the product, and with the professional partnership. 

    “They were really good. They stuck to all the deadlines we set which were quite tight at times. They had very good project management overall.” – Agent, Illustration Agency
     

  • 18
    $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 

  • 19
    $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 helped an international conservation charity with multiple projects. First, they rebuilt a Drupal E-commerce website and built the CMS for the organization. In addition, the team manages the integration with ticketing and the CRM. Finally, they also worked on developing two applications. The company's website work resulted in increases in the number of users on the site and views.  

    "We’ve seen a positive impact on the site and how people have used it. We’ve had increases in users, conversion rates, page views, and so on." – Head of Digital Services, International Conservation Charity 

  • 20
    $10,000+
    10 - 49 Employees
    Aberdeen United Kingdom

    Fabrit Global is a web app development company based in Aberdeen, U.K., with an office in Cluj-Napoca, Romania. The company, founded in 2014, has a team of more than 30 that provides web development and custom software development services. Fabrit Global serves mid-market and small companies in various industries that include financial services, hospitality & leisure, and energy & natural resources.

    Clients
    Societe Generale
    Hawkins Brown
    Pier Asset Management
    NB Group
    Industries
    Notable Project

    A personal & professional development solutions company hired Fabrit Global to create their online platform. As part of the engagement, Fabrit Global worked closely with the company to determine what they wanted out of the platform and then developed an MVP using Microsoft Azure and completed it within around three months. At present, the company offers ten courses through the platform and has attracted more than 800 users.

    "We just know what we need, and they come up with easy-to-use solutions, which are developed and deployed fast. So their flexibility and very fast delivery is also a very strong point." - Process Leader, Personal & Professional Development Solutions Company

  • 21
    $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.

    Industries
    Notable Project

    A business consultancy has tapped ClerksWell to rebuild their host system and website. They've incorporated the client's rebranding solutions into their work and continue to provide system and site maintenance.

    "ClerksWell is a highly capable team, and the only advice you need is to trust them to meet your exact needs."

  • 22
    $10,000+
    50 - 249 Employees
    Manchester 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

  • 23
    $1,000+
    10 - 49 Employees
    Belfast United Kingdom

    Zesty is a full-service digital agency based in Dublin, Ireland, with additional offices in Belfast, Northern Ireland and London, England. Zesty was founded in 1996 and has 37 employees. Services offered by Zesty include web development, web design, and digital strategy.

    Clients
    Ulster Orchestra
    GAA
    talkSPORT
    Visit Blackpool
    Industries
    Notable Project

    Zesty was responsible for web design and development for a tourism board. The project included developing a brand new website with an engaging design, along with transferring pre-existing data from the old platform to the new one. The client reports that the new site has led to double-digit growth in page views.

    "I was impressed by their ability to relate to us, understand our needs, and work towards the bigger picture." - CEO, Tourism Board

  • 24
    $25,000+
    10 - 49 Employees
    Cardiff United Kingdom

     Illustrate Digital is a web design and development agency that specializes in WordPress. Founded in 2013, they have a team of 10 between offices in Cardiff and Bristol, United Kingdom. They primarily work with midmarket clients across various industries.

    Clients
    Penguin Random House
    Honda Motorcycles
    Admiral
    Welsh Government
    Industries
    Notable Project

    Illustrated Digital assisted with branding and digital media for a fintech nonprofit. In addition to developing a WordPress site, they created content for social media. They delivered high-quality work that exceeded expectations. The team is very experienced and responsive.

    “They go the extra yard to make things right while maintaining a strong personal relationship.” – General Secretary, Fintech Nonprofit

  • 25
    $5,000+
    10 - 49 Employees
    London United Kingdom

    White Label Coders is a software house founded in 2011 and located in Gliwice, Poland. They employ 15 industry professionals specializing in Magento e-commerce and custom business web application development. They work primarily with international companies, providing innovative solutions for WordPress, e-commerce, and custom software.

    Clients
    HomeKoncept
    DrOmnibus
    Adexbud
    Industries
    Notable Project

    White Label Coders developed and managed a custom software solution to manage all business operations for a computer hardware company. They worked quickly and effectively, implementing a job management system, inventory management, a CRM, and integration with VoIP. The system is the functional foundation of the business, integral to all daily operations.

    “This system runs the entire backend of our company. Without it, we wouldn't be able to get done what we need to get done. They’re also a great team to work with. They've always delivered exactly what I needed.” – CEO, Computer Hardware Company

  • 26
    Undisclosed
    10 - 49 Employees
    Soho United Kingdom

    IdeaWork Studios is a full-service advertising, development, and design agency founded in 1999. Headquartered in New York City, the company also has offices in Santa Barbara, CA and Las Vegas, NV. The team of more than 20 employees offers branding, web design, web development, and other marketing and design services such as logo and packaging design and email marketing.

    Industries
    Notable Project

    After a wellness resort was acquired by another company, it needed to rebrand and hired IdeaWork Studios. The project included creating a new name and logo for the resort, updating its website to reflect the new branding, and launching an advertising campaign.

    "The level of creativity they showed for a complete rebranding was impressive. We needed to take the resort in a completely different direction, and they did it very quickly. It was impressive what they understood about the brand and what they put forward from a presentation standpoint." – Director of Sales and Marketing, Wellness Resort

  • 27
    $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 UK developed the platform for an online marketplace after the previous developer proved unsatisfactory. The team took wire frames and a prototype provided by the client to build a minimum viable product, using AWS, React, Python, and Django for the framework. The client spoke highly of the engagement.

    “They’re extremely knowledgeable and work closely with us to make sure we know what’s going on. Their team is phenomenal and have both dev and interpersonal skills.” — Executive, Digital Office Marketplace

  • 28
    $5,000+
    2 - 9 Employees
    London United Kingdom

    Digital product studio Series Eight is located in London. Since the company's founding in 2014, their small team of five has specialized in web design and development, UX/UI design, branding, and more with primarily small and mid-market businesses.

    Clients
    Kuoni
    Cardconnect
    First Data
    Trōv
    Industries
    Notable Project

    A skiing electronics company hired Series Eight for a complete website redesign. They wanted to optimize user experience and increase sales. Since the website's launch, conversion rates have increased. 

    "They have been absolutely excellent. Despite both our team and their team being remote, we’ve managed to maintain outstanding communication."–CCO, Skiing Electronics Company 

  • 29
    $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

    An internet services company partnered with Purr Digital for a technical solution and software platform for their mobile app. They provided the client with design, software development, and backend support for the mobile application. This resulted in a 35% conversion in regions that received 400 transactions the first two weeks.

    ”Their team has made constructive suggestions for features that we didn’t even think about, which has been quite crucial actually. They did a fantastic job. No one on my team is highly technical and Purr Digital guided us through the whole process.” — Director, Internet Services Company

  • 30
    $25,000+
    50 - 249 Employees
    Cardiff United Kingdom

    Box UK is an enterprise software development company based in Cardiff, UK, with an office in London. The company, founded in 1998, has more than 50 employees who provide, among others, custom software development, web development, and enterprise app modernization services to various businesses. 

    Clients
    OKdo.com
    Investec Asset Management
    ateb
    Welsh Government
    Industries
    Notable Project

    Box UK was hired by an Employee Benefits Service to oversee and advise on the Service's new e-commerce platform. But their service was expanded to include the development of the platform, rewriting some parts in Symfony from the original CakePHP. The client was so satisfied with the work that Box UK is still onboard to supply new features on the platform as needed. 

    "Box UK has a very modern, agile approach and is good at looking at new methods of working." - Project Manager, Employee Benefits Service 

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NEED HELP SELECTING A COMPANY?

Based on your budget, timeline, and specifications we can help you build a shortlist of companies that perfectly matches your project needs. Schedule a free consultation with a Manifest Analyst.

TELL US ABOUT YOUR PROJECT