Top 100 JavaScript Development Companies in London
March 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
- $50,000+
- 250 - 999 employees
- London, United Kingdom
One Beyond is a bespoke software development and digital transformation company headquartered in London with additional engineering centers in Madrid (Spain), Budapest & Szeged (Hungary) and Bucharest (Romania). Across international locations, they have a team of more than 350 individuals providing custom software, web and mobile application development and large- scale digital transformation to a diverse clientele.They support large established businesses, nonprofits, government organizations, and VC-funded startups
Clients
- Smith & Nephew
- GAIL's Bakery
- Costa Express
- Pearson
Industries
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One Beyond (formerly DCSL GuideSmiths) developed a cloud-based web app for a contract company. The digital tool lets users define large construction projects and streamlines the procurement process for contractors.
“Whenever there was a problem, they helped us come up with a solution.”
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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 3500+ engineers with experience in all of the latest technologies.
Clients
- ClassPass
- ZEFR
- Gain Capital (forex.com)
- Merkle
Industries
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iTechArt Group's engineers help a fintech firm with the development of their services. Some of their tasks include user onboarding, user account creation, tenant configuration management, and authentication.
"Not only have they executed the tasks given, but they've also shown an understanding of the product's impact."
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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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An online marketplace has hired Imaginary Cloud to provide website development. They took over the work of a previous partner and are doing data migration to Ruby on Rails, SEO, and feature development.
"We've worked with several developers, but Imaginary Cloud is the only partner that does what they say they'll do."
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4
- $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
- FieldBI
- AutoBI
- AgroTop
Industries
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Softblues is hired by a marketing agency to develop a custom filterable inventory section on a website and create a blog. They are also tasked with migrating the existing blog content.
"The project management team is very responsive and communicates often."
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5
- $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
- Cassbana
Industries
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A credit management platform hired Blink22 to build a mobile app that featured invoice and receipt functions, credit transaction recording, automatic payment reminders, and SMS and WhatsApp integrations.
"We were able to launch the app, iterate on it, and build on the foundations that they had set up for us."
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6
- $10,000+
- 50 - 249 employees
- London, United Kingdom
Peiko is an IT development company located in Kyiv, Ukraine. Comprising 19 employees, they develop software solutions for various sized companies in IT, business services, finance, and healthcare. Services include frontend and backend development, UX and UI design, database management, testing, QA, and website management.
Clients
- OrionProtocol (Top 250 Cryptocurrencies on CoinMarketcap. The first gateway to the entire crypto market: aggregating every CEX, DEX, and swap pool into one decentralized platform. The market cap of ORN is 250 000 000$)
- LocalAway (Silicon Valley marketplace)
- Riabu, ContactsBook, Investros Exchange (SaaS projects of HongBao Media)
- GS Diamonds (Australian gewelry eCommerce)
Industries
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Peiko provided mobile app development services to a cryptocurrency startup. After refactoring the client's server, they implemented software to create a mobile app using PHP, Node.js, and React.
"We were most impressed with their approach to the work; they solved all our problems."
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7
- $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 brand, naming, and language studio was looking to supplement their branding and web design efforts, so they hired Together to develop the strategy, design, assets, and website of one of their customers.
"We think very highly of them, and we hope to work with them again in the future."
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8
- $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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Andersen Inc. deploys engineers to help a fintech firm with their software development project. Their team is involved in the development lifecycle, from maintaining old functionalities to making new features.
"We can entrust almost any task and be sure of a good result."
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9
- $100,000+
- 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 connected a retail bank with skilled resources to complete cross-platform mobile app development services using Kotlin and Java. They also put together a two-year service improvement roadmap.
“I have nothing but good things to say about hedgehog lab.”
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10
- $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 B2B entertainment platform was looking to integrate blockchain technology into its system, so they engaged with Tech Alchemy for their custom software development sevices.
"They’re a solid team with excellent synergy, and they’ve merged well into the project."
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11
- $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 has provided web development services to a SaaS company to increase their site's performance. They've rebuilt and stabilized the website.
"They had straightforward communication and stuck to deadlines."
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12
- $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
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Infinum was a subcontractor on a government transport division’s electronic reporting platform development project. They worked in Ruby on Rails, making mock-ups and running user and factory acceptance tests.
“Infinum’s team was young and dynamic, which gave us the feeling that they were interested in what we were doing.”
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13
- $10,000+
- 50 - 249 employees
- London, United Kingdom
Plavno, a website development firm, is based in Nur - Sultan, Kazakhstan. They offer web development, mobile app development, and blockchain and were founded in 2007.
Clients
- Mercedes, Xerox, Kia, eBay, PayPal, Amazon , IBM, Bank, Mediacube
Industries
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A software development company hired Plavno to build an MVP app. The team was involved in every project phase from planning to deployment. They used React, Redux, and CSS animations, among other technologies.
"Plavno's team was highly skilled and experienced in using cutting-edge technologies."
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14
- $10,000+
- 50 - 249 employees
- London, United Kingdom
Brocoders is a software development company for VC-backed startups and midsize businesses based in Daytona Beach, Fla. Founded in 2014, Brocoders has a team of more than 70 specialists and has expanded to a second office in Kyiv, Ukraine to serve clients around the world. They provide web, cross-platform mobile app, custom software, and cloud architecture development.
Clients
- Gokada
- Ridesharing Application
- EveryPig
- MyCurrency
Industries
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Brocoders developed custom software for a SaaS company. The team utilized React.js and progressive web apps to meet all the client's requirements. They also handled continuous improvements and new features.
"I had very great communication with the team."
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15
- $10,000+
- 10 - 49 employees
- London, 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 refreshed a cleaning products manufacturer's brand identity, including their logo, fonts, colors, and templates. They used an existing brand framework to build a new one and created a brand book.
"The team is very friendly, listens well, and provides a service that matches what we are looking for."
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16
- $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 website for a climate change think tank. They also provided support during a company event, ensuring the website was compatible with the correct server and technology.
"Hiyield excellently developed and managed the site."
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17
- $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
- Gaming Engage
- CarLend Deals
- Tapway
Industries
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Light IT Global is the iOS development contractor of a software development company. With the client's guidance, they work on iOS development, using Swift as the main tool and Python for the AI functionality.
"We really appreciate the openness."
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18
- $5,000+
- 50 - 249 employees
- London, United Kingdom
In Saint Petersburg, Florida; Jaipur, India; Gurugram, India and Gurugram, India, DianApps is an app development firm. Established in 2017, the midsize team offers mobile app development, web development, and ux/ui design.
Clients
- Pagarkhata
- NOZL
- Tripp
Industries
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DianApps has developed a web-based application for a veterinary service provider. They’ve created the event-planning application from scratch, which features multiple user profiles and a messaging tool.
“DianApps has executed a successful build and exceeded my navigation and functionality expectations."
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19
- $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 has developed a mobile app for a pharmaceutical collaborative strategic platform. They’ve worked on the UX/UI design and started building the product for iPhone, iPad, and desktop devices.
“Their interpretation of our needs and the design are exceptional.”
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20
- $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 developed a Sharepoint solution to improve a children's charity organization's data management and delivered an interactive wiki.
"We were very impressed with Influential for the positive meetings and collaboration between our two companies."
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21
- $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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Agile Digital Agency provides ongoing SEO services for a law firm. They have also redesigned their website, fixed their profile, reorganized content, and helped with their social media and Youtube channel.
"They have a high level of knowledge in their field."
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22
- $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 built a web app to consolidate a video production company's processes. They aimed to create a one-stop show to allow end-to-end project management for their productions.
"Our product owner went to great lengths to speak over the phone any time it was required."
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23
- $5,000+
- 2 - 9 employees
- London, United Kingdom
Burst Digital is a web design company in London, United Kingdom. They offer web design, graphic design, web development, digital strategy, and more and were launched in 2018.
Clients
- Vivienne Westwood - The Vivienne Foundation
- Lucinda Green
- Clean Kitchen
- Verity Bowditch
Industries
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Burst Digital is helping a digital marketing agency develop and design their website from scratch. They’re also helping the client create their brand guidelines and logo.
"They’ve been very helpful and responsive throughout the engagement."
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24
- $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 redeveloped the frontend of a nonprofit organization's web-based project. They worked on a series of lo-fi and hi-fi designs that were based on the client's feedback.
"The development work was fantastic."
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25
- $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
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Clock Limited has built a custom CMS membership platform for a media company. They have built the site from scratch, integrating the client's authentication and payment platform.
"They are constantly challenging me to improve, and I love that."
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26
- $25,000+
- 250 - 999 employees
- Borehamwood, United Kingdom
Binmile Technologies is a leading digital strategy and product engineering company based in India with offices globally and was founded in 2017. They have more than 200 employees that provide custom software, app development, web and e-commerce development, and app testing services with market-leading solutions. They expertly steer clients across the globe as they navigate their digital transformation powered by the latest technologies.
Clients
- Indigo
- Adani
- Nanovest
- Prodigi
Industries
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Binmile Technologies is creating a custom LMS for an EdTech company. The team uses an open-source LMS and enhances its features to meet requirements. The goal is to make it customizable for various solutions.
"Their culture is impressive."
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27
- $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.
Industries
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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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28
- $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
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Thought&Function supported various stages of growth for a fintech company. They built websites, incorporated SMS and open banking features into an app, and helped evaluate CTO candidates.
“The work they do is instrumental to our process, and they really help us with our exploration.”
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29
- $1,000+
- 10 - 49 employees
- London, United Kingdom
PurpleFire is a small software development firm established in 2021. Their team focuses on custom software development, web development, e-commerce development, blockchain, and more. The firm is based in Køge, Denmark.
Industries
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PurpleFire provides CRO services for a B2B sales development company. The team optimizes the firm's conversion rates across all of their sales funnels. Two teammates are working directly on the engagement.
"They were communicative and professional, and they moved quickly."
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30
- $10,000+
- 50 - 249 employees
- London, United Kingdom
Thoughtbot is a web and mobile app development company based in Boston, MA with offices in Austin, San Francisco, New York, Raleigh, Washington D.C, and London. Since 2003, this 50+ team has delivered empowering digital solutions to enterprise-level and small companies alike.
Clients
- Postmates
- Iora Health
- JoyDrive
- SplitFit
Industries
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thoughtbot has developed a mobile application for a healthcare company. After discussing the project details and goals, the team has created a roadmap, designs, and solutions to issues.
"The most impactful is thoughtbot's processes, collaboration, and guidance around product development."
Most Reviewed JavaScript Developers in London
Check out a JavaScript Developers in London with the most new reviews in the past 12 months.
JavaScript Developers
London
- 11 9 new reviews
- 12 9 new reviews
- 13 8 new reviews
- 14 8 new reviews
- 15 8 new reviews
