Looking for a top JavaScript developer in Spain?

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 Spain. 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 Spain JavaScript Developers

  • 1
    $50,000+
    250 - 999 Employees
    Madrid Spain

    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

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  • 2
    $50,000+
    250 - 999 Employees
    Barcelona Spain

    Headquartered in San Francisco, Wizeline is a global product development company with offices in Guadalajara and Mexico City, Mexico, and Ho Chi Minh, Vietnam. Since its founding in 2014, the team has grown to over 390 employees. Wizeline specializes in custom software, web, and mobile app development and UX/UI design. 

    Clients
    Mastercard
    Dell
    WSJ
    Australian Open
    Notable Project

    An entertainment company hired Wizeline to improve their website's CMS. Based on the team's initial success, they fostered a partnership that's still ongoing. The agency's skills made them stand out from comparably firms throughout the process. The client appreciates Wizeline's collaborative spirit and excellent communication skills. 

    "They have quickly learned our system, made helpful suggestions, and been very collaborative."–Senior Product Manager, Entertainment Company 

  • 3
    $10,000+
    10 - 49 Employees
    Madrid Spain

    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
    Worldpay
    SES
    Thomas Cook Airlines
    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 

  • 4
    Undisclosed
    50 - 249 Employees
    Sevilla Spain

    Cocomore AG is a communications and technology company based in Frankfurt, Germany, that was established in 2000. Their team of 146 employees provides web development, mobile app development, and e-commerce development.

    Clients
    Nestlé
    Procter & Gamble
    PwC
    SCA
    Notable Project

    Cocomore AG developed a website pro bono for a nonprofit museum. Their team fashioned an interactive UX/UI, coded the backend, provided training, and translated the museum's physical laboratory into a digital showcase using Drupal. The website received some positive feedback from users, but they planned additional improvements for its design.

    "The new site attracts researchers or experts to the museum, so they can publish their research projects. Other people are interested in using it as a communications platform." – Head of Education, Nonprofit Museum

  • 5
    $50,000+
    10 - 49 Employees
    Las Palmas de Gran Canaria Spain

    Lasting Dynamics SRL is a software agency founded in 2015 in Torre del Greco, Italy with over 10 employees. They specialize in web and mobile app development solutions for small and mid-market firms in the industries of transportation, business services, and more.

    Clients
    Wool Sportswear
    Intempus.dk
    Mindcap A/S
    Industries
    Notable Project

    Lasting Dynamics SRL developed an app for a fitness and nutrition startup. The app needed additional features implemented before its launch on iOS and Android devices. The features were implemented in three weeks.

    “The project manager was easy to communicate with, professional and knowledgeable.” - Founder, Fitness and Nutrition Startup

  • 6
    $10,000+
    10 - 49 Employees
    Madrid Spain

    redradix is a boutique design and development agency, founded in 2010 and located in Madrid, Spain. They have 25 employees specializing in web development and design, UI and UX design, mobile platforms, and CMS. They typically work with small and midmarket companies in advertising and marketing, healthcare, and finance.

    Clients
    GMV
    Indra
    Telefónica
    Industries
    Notable Project

    redadrix provided testing development services to a telecommunications company, working on modeling the experience for a new interphase development. They used editors for some of the JavaScript coding. The testing project ran smoothly, allowing the client to effectively demonstrate their plans to management and even use some of the coding in the final end product.

    “They did great research work and ensured the tools were compatible with what we needed. I can say that the project worked well — it helped us to show our upper management the project and allow them to understand what we wanted to create.” – Head of UX & UI, Telecommunications Company

  • 7
    $10,000+
    50 - 249 Employees
    Barcelona Spain

    Systematix Infotech Pvt. Ltd is a software development company headquartered in Charlotte, N.C., with offices in Singapore and Indore, India. Since 2005, their team of 534 has offered custom software, web, and mobile app development assistance to small firms, midmarket businesses, and enterprises. They have designed apps built for business intelligence, e-commerce, field operations, and for other uses as well.

    Clients
    Ettika
    School Space Media
    Capitol Commodity Hedging Services
    Industries
    Notable Project

    Systematix Infotech Pvt. Ltd developed an iOS app for a software company. The app is a portal that displays jobs to users. In particular, Systematix Infotech Pvt. Ltd properly developed the UI and workflow of the app.

    "Their project and time management were excellent. Their progress updates were consistent, and they clarified requirements promptly to avoid overhead and revision. That was important, since the project had a tight deadline." - IT Manager, Software Company

  • 8
    $5,000+
    2 - 9 Employees
    Madrid Spain

    Appetite Creative Solutions is a creative digital marketing agency in London, England – with offices in Madrid and Dubai, too. Established in 2015, Appetite Creative Solutions has a team of 25 employees. They offer logo, web design, games development, and social media marketing services.

    Clients
    Starbucks
    Bacardi
    Coca Cola
    Tetra Pak
    Industries
    Notable Project

    Appetite Creative Solutions developed a marketing campaign for a digital sales company to increase exposure. They created mockups, high-impact ads, and eye-catching marketing games. The clients' were pleased with the innovative designs.

    "They’re hands-on, accommodating, and creative." – Marketing & Advertising Professional, Digital Sales Company

  • 9
    $50,000+
    50 - 249 Employees
    Barcelona Spain

    United Virtualities is a tech consultancy in New York; Buenos Aires, Argentina; Guadalajara, Mexico; and Barcelona, Spain. Founded in 2009, they have about 121 employees that serve clients in the consumer products, financial services, and healthcare industries. Services include IT strategy, web development, and big data consulting.

    Clients
    Converse
    Godiva
    National Geographic
    Samsung
    Industries
    Notable Project

    United Virtualities provided web development services for a virtual education platform. Their team built a website that presents and archives webcasts. The platform has received positive feedback for its look and functionality.

    “The expertise they provided to build a very technically challenging website was remarkable.” – President & Owner, Virtual Education Website

  • 10
    $10,000+
    10 - 49 Employees
    Madrid Spain

    Based in Madrid, Aluxion is a digital product agency that was founded in 2014.  Aluxion and their team of 15 specialize in web design, web development, UX/UI design, and custom software development. The agency mainly works with mid-sized businesses. 

    Clients
    Santander
    Asisa
    Globalvia
    Amadeus
    Industries
    Notable Project

    Aluxion developed a WordPress site that extended the concept of a marketing agency's social media project.  They also created the design for the site, and their abilities and agility impressed. 

    "They understand the project, know what we want, and don't just wait for us to tell them what to do. They've taken our ideas and transformed them into the site. " – COO, Digital Marketing Agency

  • 11
    $10,000+
    10 - 49 Employees
    Valencia Spain

    Yeeply Mobile is a mobile development marketplace headquartered in London with offices in Paris and Valencia, Spain. Founded in 2012, Yeeply Mobile's team of around 30 employees primarily provides mobile app development services, but can also offer UX/UI design and mobile & app marketing capabilities.

    Clients
    LaLiga
    Panini
    Groopify
    Microsoft
    Notable Project

    Yeeply worked with a consulting firm to develop custom WordPress websites with CSS programming. Yeeply also created an SEO strategy while building blogs and other websites for some of the client's customers. The client has reported seeing an increase in traffic in the previous three months, with clients commenting on their websites changed image and usability. 

    "They were very well organized and I felt confident throughout the project." – Marketing Director, Consulting Firm

  • 12
    $10,000+
    10 - 49 Employees
    Las Palmas de Gran Canaria Spain

    Established in 2018, Squaads is a small mobile app development company. Their team offers mobile app development, web development, custom software development, enterprise app modernization, and more. The agency is based in Las Palmas de Gran Canaria, Spain.

    Industries
    Notable Project

    Squaads developed a data management software for an animal breeding consultancy firm using Angular and Nodejs. As a result, Redil increased it's data efficiency and scaled it's business. 

    Squuad was easy to interact with, deadlines were met on a weekly basis. There was open communication across channels.

  • 13
    $25,000+
    10 - 49 Employees
    Barcelona Spain

    Vrrb Interactive is a digital agency based in Los Angeles, with a second office in San Francisco. Founded in 2007, their team consists of around 10 employees. They offer web design, web development, and mobile app development. The primarily serve small and midmarket businesses in the advertising, business, and consumer products industries.

    Clients
    Tempo
    HomeHero
    Biotene
    ULCA
    Industries
    Notable Project

    Vrrb Interactive collaborated with an e-learning platform on multiple technical processes. They assisted with web design and UI/UX design for their web app, including the early stages of an offering platform, a publishing platform, and analytics. The client has received positive feedback on their work.

    “They were great. They worked quick. That's one of the things we liked about them. They followed through across the board.” – CEO, E-Learning Platform
     

  • 14
    $5,000+
    10 - 49 Employees
    Barcelona Spain

    DevsData LLC is an IT consulting company based in New York City with an office in San Francisco. The company, founded in 2016, has more than 30 employees that provide, among others, IT strategy consulting, BI & big data consulting & SI, and custom software development services to enterprise and midmarket companies and institutions. 

    Clients
    Novartis
    Varner
    True Group
    Pioneer Labs
    Industries
    Notable Project

    DevsData was hired by an insurance startup to help with large-scale data mining and machine learning, as well as build a dashboard for data visualization. These services brought about a 25% increase in the startup's NPS.

    "You could ping Tom any time, day or night and he would respond and propose a solution immediately."  - Project Manager, insurance startup

  • 15
    $25,000+
    10 - 49 Employees
    Las Palmas de Gran Canaria Spain

    Based in Las Palmas, Spain, Secret Source is an outsourcing development company founded in 2008. Their team of 28 specializes in web design, web development, e-commerce development, mobile app development, and more.  

    Clients
    CGNET Services
    System 2
    ISL Recruitment
    Apply4 Technology;
    Industries
    Notable Project

    Secret Source expanded an online application platform for a film company. They stabilized the platform, and its performance pleased the client to the point they decided to license our the software to other companies. Secret Source delivered great work and the website has received positive feedback.

    "It’s been great working with someone who understands development and could hold our hands throughout the entire process."– CEO, Film Company

  • 16
    $1,000+
    10 - 49 Employees
    Barcelona Spain

    ExpandX Marketing & Web is a digital marketing agency and web solutions provider headquartered in Sofia, Bulgaria. It also has locations in London and Washington, D.C. The company was founded in 2015, has a team of 6 people, and provides digital strategy, marketing strategy, and social media marketing for mostly mid-market and small businesses in the business services, consumer products & services, and health care & medical services industries. 
     

    Clients
    Best Western Hotels
    OSM International Group (Italy)
    Telelink Services Group (Bulgaria)
    Spaces Property Group (UK)
    Industries
    Notable Project

    ExpandX developed a website and created branding and marketing material for an IT systems company. The company created an appealing and interactive website for the client that included an easy-to-use admin panel and was optimized for SEO. Additionally, the company generated new branding and marketing strategies for the client. ExpandX’s services improved search rankings, the visibility of the client’s brand ambassador program, and the client’s overall visibility.

    “They advised us and offered the most up-to-date solutions in web design, content marketing, web development, and digital marketing. This further increased our satisfaction with their work.” – Marketing Manager, IT Systems Company

  • 17
    $10,000+
    10 - 49 Employees
    Madrid Spain

    Develapps is a mobile design and development company founded in 2008. Develapps is headquartered in Madrid with additional offices in Valencia, Spain and London. Their team of 14 offers a wide range of services including mobile app development, web development, custom software development, web design, application management & support, enterprise app modernization, and others.

    Clients
    LG Electronics
    Santander
    Aquaservice
    Industries
    Notable Project

    A sports analytics company sought to develop an app that allows players to record their statistics. Develapps developed everything necessary for iOS and Android apps, taking the project from start to finish.

    "Develapps provides a very professional service. I've worked with lots of freelancers and other developers, and working with Develapps has proved to be very tidy in comparison from a technical and organizational standpoint." — Founder, Sports Analytics Company

  • 18
    Undisclosed
    10 - 49 Employees
    Barcelona Spain

    Slashmobility is a mobile application development firm based in Barcelona, Spain with offices in Madrid and London. Founded in 2010, the company has about 35 employees that primarily build enterprise mobile solutions for corporate clients. Slashmobility's services include mobile app development, UX/UI design, web development, application testing, and wearable app development.

    Clients
    Desigual
    HP
    Zurich
    Bank of America
    Industries
    Notable Project

    A social shopping startup partnered with Slashmobility to develop a platform that allows companies to include targeted promotions on goods and services. The Slashmobility team delivered native applications for Android and iOS, which have garnered over one million downloads since launch.

    "The app has obviously been successful, and we’re happy with the work they’ve done as we continue to work with them." – Project Manager, Social Shopping Company

  • 19
    $25,000+
    10 - 49 Employees
    Barcelona Spain

    Hello Pomelo is a software development company founded in 2017 in Paris and with secondary offices in Bordeaux, France and Barcelona, Spain. With about 20 employees on their team, they offer custom software development, web development, and mobile app development mostly to medium-sized companies in financial services, media, business services, and education sectors.

    Clients
    BNP Paribas
    Groupe Bertrand
    UGPBAN
    Industries
    Notable Project

    Hello Pomelo developed a customized software solution for a telecommunications company that needed to optimize its fleet management. They delivered within six months and provided support and additions for the platform. The client expressed that the software was user-friendly and issue-free. 

    "Our clientele continues to grow." – Head of Sales, Telecommunications Company

  • 20
    $10,000+
    10 - 49 Employees
    Castelldefels Spain

    Unimedia Technology is a website development company. Their small team is located in Castelldefels, Spain. Their services include web development, custom software development, mobile app development, and e-commerce development. The firm was launched in 2017.

    Industries
    Notable Project

    Unimedia Technology has developed a website for a digital advertising company. The team is tasked with creating a system that allows the customer to generate their advertising campaigns effects in real time.

    "Their commitment inspired a lot of trusts, which is important in the collaboration."

  • 21
    Undisclosed
    2 - 9 Employees
    València Spain

    We are Cactus S.L. is a development agency based in Valencia, Spain. Since 2014, their current, small team of 9 are experts in web design and development, custom software development, and branding. We are Cactus S.L. mainly works with small businesses. 

    Clients
    Las Naves
    ReadBug
    Navilo
    Notable Project

    We are Cactus S.L. completed backend dashboard development for a call center based in Spain. They also partnered with another agency to help with frontend development and integrated the center's chat systems. The client was extremely impressed with their flexibility and commitment. 

    "They have a very flexible team that reacts to problems very well. They have known how to alter their work and employees in order to provide the extra support we need. They have always given us support when it’s necessary. We feel supported and they feel as part of our project and the team. "– CEO, Mobile Calling Center

  • 22
    $10,000+
    2 - 9 Employees
    Barcelona Spain
    Located in Barcelona, Spain, Onabitz is a small application development firm. They provide mobile app development, ux/ui design, e-commerce development, and web development and were founded in 2017.
    Industries
    Notable Project

    Onabitz developed a mobile app for a training company. They aim to develop a training center communication tool that includes available courses, registration, and certificates.

    "I am impressed by their humane treatment and professionalism."

  • 23
    $5,000+
    10 - 49 Employees
    Olot Spain

    Volcanic Internet is a small software development firm in Olot, Spain; Barcelona, Spain; Amsterdam, Netherlands and Wales, United Kingdom. Launched in 2009, the team offers custom software development, web development, e-commerce development, mobile app development, and more.

    Industries
    Notable Project

    An AI development company hired Volcanic Internet to augment their staff and software development services. The tech stack they used includes Node.js, PostgreSQL, Docker, and Kubernetes.

    "Whether it’s changing developers or changing technologies, they’re willing to discuss and accommodate my needs."

  • 24
    $5,000+
    50 - 249 Employees
    Badalona Spain

    Iyrix Tech is an IT staff augmentation company. They are based in San Francisco, California; Badalona, Spain and Sialkot, Pakistan and have a small team. Their services include IT staff augmentation, mobile app development, BI & big data consulting & SI, web development, and more. The agency was founded in 2015.

    Industries
    Notable Project

    Iyrix Tech delivers software components for the products of an e-learning technology company. They mainly use PHP for development, as well as MySQL databases and GitHub.

    "We have daily communication with them, and they feel like part of our team."

  • 25
    $5,000+
    10 - 49 Employees
    Barcelona Spain

    Asamblo is a development agency founded in 2015 in Buenos Aires, Argentina. They have secondary locations in Miami and Barcelona, Spain, and a team of about 20 employees. They mainly provide custom software development, web development, and mobile app development to small-to-medium-sized businesses in financial services, healthcare, and other industries.

    Clients
    Dr. Contact Lens
    Visa
    Adidas
    Industries
    Notable Project

    Asamblo developed a web application for a dental clinic that needed a new system that would allow the business to scale. Through daily communication, their team delivered the solution to 100% perfection after a few rounds of changes.

    "...they have a team of young functional analysts with great capacity to understand the operations of a dental company." – CTO, Dental Clinic

  • 26
    $25,000+
    10 - 49 Employees
    Córdoba Spain

    Headquartered in Córdoba, Spain, The Neon Project is a digital agency that assists with large organizations and startups. Since 2018, their team of 15+ has been specializing in web development, custom software development, artificial intelligence, and blockchain. 

    Notable Project

    The Neon Project was hired by an IoT company to develop their smart locker solution for tourists. The team used React and Python to build the solution and the entire booking process. The reviews have been positive, and tourists say that the flow is effortless.

    "The Neon Project is the best company you can get to work with." – CEO, IoT company

  • 27
    $1,000+
    Freelancer
    Barcelona Spain

    Hable Studios is a web design and development studio based in Barcelona. Founded in 2018, they serve small and midmarket businesses in industries such as arts and entertainment, business services, and education.

    Clients
    Paperclip
    Folk Oslo
    Go Good
    Machinic Protocols
    Industries
    Notable Project

    Hable Studios provided web development services for a coworking space. The team customized a WordPress site and provided graphic design collateral. Their straightforward, efficient service exceeded expectations. 

    "They delivered a simple solution and were always available to us." — Co-Founder, Coworking Space

  • 28
    $1,000+
    2 - 9 Employees
    Puerto Real Spain

    Libnamic is a digital firm based in Puerto Real, Spain with over two employees. Founded in 2017, they offer web design, IT strategy consulting, and IT managed services for small and mid-market businesses in the fields of IT and government agencies, among others.

    Clients
    University of Seville
    Complutense University of Madrid
    Carlos III University of Madrid
    Industries
    Notable Project

    Libnamic provided hosting services for a web dev company. The company wanted to improve the overall loading times of the sites that they manage. Libnamic improved many of the loading times by as much as 80%.

    “It is very easy to work with Libnamic as they have a standardized process for migrating and creating websites.” - Founder & SEO, Web Dev Company

  • 29
    $10,000+
    10 - 49 Employees
    Madrid Spain

    Atlann is an IT company based in Madrid, Spain, and founded in 2017. With over 10 experts, they offer custom software, web, and mobile app development services for clients ranging from small firms to large companies in the fields of advertising, media, and real estate.

    Clients
    Heineken
    Talent Garden
    Pepe Housing
    Industries
    Notable Project

    Atlann provided app development services for an online training agency. The agency was finding it difficult to follow-up on participants. Atlann developed a solution that is used worldwide and is 100% functional.

    “We have to be realistic in the day-to-day work, and Atlann helped manage our expectations.” - Founder & CEO, Online Training Agency

  • 30
    $10,000+
    10 - 49 Employees
    Madrid Spain
    Launched in 2017, Etéreo is a small software development firm located in Madrid, Spain. Their services include custom software development, web development, mobile app development, enterprise app modernization, and more.
    Industries
    Notable Project

    A telecommunications company hired Etéreo for the development of an old website. The client's goal was to improve UI/UX and redesign the site's interface. 

    "They give innovative solutions to problems and they are business-oriented."

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