Top 100 JavaScript Development Companies in London

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Top 100 JavaScript Development Companies in London

December 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 built a web platform that allows the occupants of high-rise buildings to interact, even in areas with poor Internet connectivity. The project team also handles other mobile app projects.

    “They proceed professionally—no cutting corners, no ambiguity, no rushing into things before they know what they’re doing.”

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  • 2
    • Scheduling

      4.7
    • Quality

      4.8
    • Cost

      4.7
    • NPS

      4.9
    Read Full Reviews on Clutch Visit Site
    • $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

    Notable Project

    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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  • 3
    • 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

    Softblues developed a custom platform to manage and automate operations associated with agricultural land management. This includes tracking soil fertility and task performance.

    "The teams demonstrate a high level of responsibility at every stage of cooperation."

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  • 4
    • $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

    Notable Project

    Imaginary Cloud developed an app for a digital feedback assessment effort. They handled the front- and backend production for the platform and created a dashboard. They provide ongoing technical support.

    "The team, deliverables, and overall experience have all been fantastic— I couldn’t ask for anything more."

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  • 5
    • Scheduling

      5.0
    • Quality

      5.0
    • Cost

      4.9
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $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

    Notable Project

    Peiko has designed and developed a website for a blockchain platform. They’ve built the site from scratch using Figma and Visual Basic; the platform allows investors to trade tokens in a decentralized manner.

    “The team is well-structured, organized, and experienced in their area.”

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  • 6
    • Scheduling

      4.8
    • Quality

      4.9
    • Cost

      4.8
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $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

    Notable Project

    Blink22 provided Android application development services, implementing wireframes for the native application while also contributing their own ideas.

    “They proved to be very proactive in a way they helped us solve problems.”

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  • 7
    • Scheduling

      4.7
    • Quality

      4.9
    • Cost

      4.8
    • NPS

      4.9
    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 provided branding and web design services for a fintech company. They redesigned the client's website, focusing on the design and development aspects. 

    "They were patient and willing to take feedback."

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  • 8
    • Scheduling

      4.5
    • Quality

      4.6
    • Cost

      4.5
    • NPS

      4.9
    Read Full Reviews on Clutch Visit Site
    • $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

    Notable Project

    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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  • 9
    • $25,000+
    • 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 augments a product developer's internal team during long-term, intensive projects. They provide full stack development and implementation for websites and cloud-based solutions.

    "They really try to find appropriate solutions for all of our requests."

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  • 10
    • 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

    Tech Alchemy provided fullscale design and development support to create a platform. They built the screens and UI, and compiled relevant data to form the final product.

    "Their adaptability and ability to respond to technical challenges were impressive."

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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

    Notable Project

    GoodCore Software developed a custom shopping cart configurator that designed product models and delivered quotes. They built the tool using PHP, Linux, CodeIgniter, and a MySQL database. 

    "Their communication and understanding of our requirements were outstanding."

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  • 12
    • Scheduling

      4.9
    • Quality

      4.8
    • Cost

      4.9
    • NPS

      4.9
    Read Full Reviews on Clutch Visit Site
    • $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

    Notable Project

    appreal.net helped develop the front end of an iOS messaging and social app. The team worked predominantly on UI/UX. 

    "They’ve been able to execute everything we’ve wanted them to execute. They’re good at understanding the product."

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  • 13
    • Scheduling

      4.6
    • Quality

      4.8
    • Cost

      4.5
    • NPS

      5.0
    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 handled both the design and development of an iOS application in Objective-C, migrating the client’s previous app from PhoneGap.

    "Infinum has been considerate about our requests and paid a lot of attention to them."

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  • 14
    • Scheduling

      4.8
    • Quality

      4.7
    • Cost

      4.8
    • NPS

      4.7
    Read Full Reviews on Clutch Visit Site
    • $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

    Notable Project

    Powercode developed a website that mirrored the flagship mobile app of a celebrity communication company. The key technologies they use include Node.js, React.js, React Native, AWS, SendGrid, and Fondy. 

    "They delivered amazing results, and I was impressed by their speed and stability."

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  • 15
    • Scheduling

      4.8
    • Quality

      4.9
    • Cost

      4.7
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $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

    Notable Project

    Hiyield created a wellbeing assessment web application for a wellness company. The team provided an intuitive design that can be fully utilized within 90 seconds, supporting the welfare of people. 

    "Hiyield designed an incredible product!"

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  • 16
    • $25,000+
    • 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

    Notable Project

    Starting from scratch, Valiant Design redesigned the WordPress website of a protection material manufacturer. The team took the client’s goals and visual requirements to deliver an SEO-sensitive platform.

    “They’re very good at turning your ideas into reality.”

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  • 17
    • Scheduling

      4.7
    • Quality

      4.8
    • Cost

      4.5
    • NPS

      4.8
    Read Full Reviews on Clutch Visit Site
    • $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

    Notable Project

    A skincare, makeup, and personal care app has hired DianApps to take over the development of their app MVP. They first reviewed coding from previous developers, and then they made a list of deliverables.

    "The team is professional, skilled, and service-focused."

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  • 18
    • Scheduling

      4.4
    • Quality

      4.8
    • Cost

      4.3
    • NPS

      4.7
    Read Full Reviews on Clutch Visit Site
    • $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

    Notable Project

    NEVERBLAND provides branding and web development services for a functional beverage brand. They’ve helped develop the brand’s voice and visual identity and are building the website starting with a template.

    “They always recommend the right solution and are very aware of what we need.”

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  • 19
    • $10,000+
    • 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

    Notable Project

    Magora Systems has helped with DevOps and worked on the main core system for a mobility solutions company. They’ve also built systems from scratch using PHP, JavaScript, and relational databases hosted on AWS.

    “They’re a stable and reliable team.”

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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

    Notable Project

    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
    • $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

    Notable Project

    Burst Digital was hired by a financial management company for their web development and branding services. The team's other tasks include ongoing maintenance and content creation.

    "Burst Digital helped us establish our branding and visibility."

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  • 22
    • Scheduling

      4.9
    • Quality

      5.0
    • Cost

      5.0
    • NPS

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

    Notable Project

    Old.St Labs has developed a cross-platform mobile app for a marketing and booking platform with an integrated payment system using provided mock-ups. The app lets users book services they need to make a record. 

    “Their team has excellent customer service and makes sure all of our needs are met.”

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  • 23
    • $25,000+
    • 50 - 249 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
    • Credit Agricole Assurance
    • Allianz Partners
    • AXA Partners

    Industries

    Notable Project

    Altkom Software helped an AI company with their due diligence. The team audited the company's product delivery process, development process, system architecture, security, control system, and testing approach.

    "I appreciated the communication skills and the ability to provide feedback."

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  • 24
    • $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 provides development services for a digital health company. They work on a mobile app’s frontend using React Native and the backend using AWS. Currently, they also work on a web application.

    “Thoughts&Function’s team delivers everything we need.”

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  • 25
    • Scheduling

      5.0
    • Quality

      4.9
    • Cost

      4.9
    • NPS

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

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

    Clients

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

    Industries

    Notable Project

    A real estate investment company hired with Brand Vision to provide a number of services. These include designing their website and landing pages, managing said pages, and helping with ad campaigns.

    "The speed of work and the transparency are impressive."

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  • 26
    • $10,000+
    • 10 - 49 employees
    • London, United Kingdom

    Top Notch Dezigns is a web design and digital marketing agency from New York. It was founded in 2004 and now has a team of 26 that does web design and development, mobile apps, SEO, SEM, and more for clients across a variety of industries, from business services to consumer products. 

    Clients

    • Meadowbrook Financial Mortgage Bankers
    • Brick Education
    • Long Island University
    • Wolo Manufacturing Corporation

    Industries

    Notable Project

    Top Notch Dezigns redesigned a website, adding a corporate video and improving the layout. The new website allows customers to search for loan officers, see client testimonials, and view reviews.

    "They're proud of their work and want to make their clients happy."

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  • 27
    • $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

    Ester Digital handled a complete brand and landing page overhaul with the objective of increasing client conversion.

    "We really couldn't ask for much more."

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  • 28
    • Scheduling

      4.9
    • Quality

      4.9
    • Cost

      5.0
    • NPS

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

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

    Clients

    • Tesco
    • Wicked Gummy Co
    • Millionaire Beauty
    • Vitamasques

    Industries

    Notable Project

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

    “They deliver on their promises.”

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  • 29
    • 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 created a simple, straightforward app to serve clients in the luxury nightlife market. They later guided the app through several iterations.

    "I think they’re good at finding the right approach."

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  • 30
    • Scheduling

      4.8
    • Quality

      5.0
    • Cost

      4.8
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $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

    Notable Project

    PurpleFire was hired by an e-commerce store for UX, checkout flow, and conversion rate optimization improvements. They helped the client improve product pages to be more helpful to their customers.

    "We had a really good experience with PurpleFire."

    Visit Site

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