Looking for a top JavaScript developer in Seattle?

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 Seattle. 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 Seattle JavaScript Developers

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  • 2
    $10,000+
    250 - 999 Employees
    Olympia WA

    Celebrate Drupal is a web development and design firm in Seattle. It was founded in 2009, and its team of 8 helps clients with IT staff augmentation, custom software development, UI/UX design, and e-commerce development in addition to web design and development.

    Clients
    State of North Carolina
    U.S. Department of Veterans Affairs
    U.S. Department of Education
    Hasbro
    Industries
    Notable Project

    A networking nonprofit hired Celebrate Drupal after a member said that its website was not being used as effectively as possible. Celebrate Drupal manages the website's back end, keeps the design current, and provides updates and staff training.

    "If I have something I need them to work on, we're in constant contact with each other, and I never really had that with any other developer before. Their level of responsiveness is very high, even though we have a three-hour time difference. We're very cognizant of each other's work schedules, and they're very accommodating." - Finance & Technology Manager, Networking Nonprofit

  • 3
    $25,000+
    10 - 49 Employees
    Seattle WA

    Culture Foundry is a web agency founded in Seattle in 2010 with more than 10 employees. They specialize in digital strategy, web design, and web development solutions for small and mid-market firms in the fields of arts, IT, and financial services.

    Clients
    24 Hour Fitness
    Audinate
    Ballet Austin
    Industries
    Notable Project

    Culture Foundry developed a website for a tech community and events group. The website was built with WordPress and was also optimized for SEO support. The group sees more and more traffic to the site each month.

    “Anytime issues came up, they were immediately responded to.” - Founder & CEO, Tech Community and Events Group

  • 4
    $5,000+
    50 - 249 Employees
    Seattle WA

    Forum One is a full-service digital design firm that was founded in 1997. The company has more than 100 employees in Alexandria, Va., Washington, D.C., and Seattle. Forum One offers web design, UX/UI design, web development, branding, and other digital services for mainly nonprofits and government agencies.

    Clients
    Smithsonian Institution
    Bill & Melinda Gates Foundation
    World Wildlife Fund
    Peace Corps
    Industries
    Notable Project

    A museum was preparing for its opening and only had a simple website. Forum One built a robust Drupal 7 website that incorporated important educational and search features. Forum One continues to maintain the website and incorporates events happening at the museum.

    "We’re pleased with their work, and our audience has responded positively to the functionality, design, and usability ... They’re a very talented group and open to collaboration. We will continue our relationship with them and continue to improve upon it." - Chief Digital Officer, Museum

  • 5
    $10,000+
    10 - 49 Employees
    Seattle WA

    Helpful Human is a development agency based in Seattle. Since 2013, their team of 15 has been specializing in web design and development, mobile app development, and UX/UI design. They work primarily with small businesses in the information services and business services industries.

    Clients
    Rudy's
    naturewise
    Elm Coffee Roasters
    Holland America Line
    Industries
    Notable Project

    A tech startup hired Helpful Human for their design expertise. They conducted background research, made suggestions for a prototype test, and will assist with future phases. The client prides Helpful Human on being responsive. 

    "Their experience and expertise played a major part and they were thoughtful and insightful." – Owner, Technology Startup 

  • 6
    $5,000+
    2 - 9 Employees
    Monroe WA

    Efinitytech is a web design company located in Monroe, Wash. Founded in 1998, Efinitytech's team of around 5 employees specializes in web design, web development, and ecommerce development. Efinitytech's clients are primarily small businesses in the ecommerce, real estate, and consumer product spaces.

    Clients
    Barn Pros
    Bed Voyage
    Orthman
    Matheus Lumber
    Industries
    Notable Project

    Efinitytech worked with a publishing group aiming to garner more web traffic, improve website security, and build a mobile app. In addition to providing these services, Efinitytech assisted with improving SEO and expanding payment options on the client's ecommerce website. The client planned to increase their investment with Efinitytech in the future.

    "We’ve had over 450% growth in the last two years. Our first website had a WordPress interface, which only had 5% of the functionality compared to Efinity Tech’s version. They built our website quickly, efficiently, and effectively." – CEO, Publishing Group

  • 7
    $5,000+
    10 - 49 Employees
    Seattle WA

    Hero Creative is a Seattle-based media production company founded in 2012. Their team of around 10 employees provides marketing strategy, branding, advertising and web design. They primarily serve enterprise clients in the advertising, hospitality and nonprofit industries.

    Clients
    Crescent Down Works
    Greystar
    Avenue 5
    Leukemia and Lymphoma Society
    Industries
    Notable Project

    A nonprofit hired Hero Creative as a visual storytelling partner. They offered professional photography, filming services and web development. The client praised their creativity, commitment and passion.

    “They’re fun, creative, and down to earth—and they love devising innovative solutions to our challenges.” – Vice President of Communications, Nonprofit
     

  • 8
    $25,000+
    2 - 9 Employees
    Seattle WA

    Northwest Independent Ruby Development is a digital agency based in Seattle. Since 2011, the small team of four has specialized in providing web and custom software development. 

    Clients
    Inkd
    ;University of Washington
    Expedia
    Whitepages
    Notable Project

    Northwest Independent Ruby Development was hired to create software for a mental health project. Because of their work, the software was easier to manage internally.

    "They [Northwest Independent Ruby Development] are good at translating to us what they need to do as a developer to make the program work."- Customer Service and Operations Manager, Mental Health Project

  • 9
    $1,000+
    2 - 9 Employees
    Seattle WA

    Visualwebz is a digital design and marketing agency located in Renton, Wash., with under 10 employees. Founded in 2008, the company mainly provides web design and development, e-commerce development, SEO services, and content marketing using a variety of programs and systems.

    Clients
    NW Ambulance
    Animal Psychology Center
    Top Ten Golf Products
    Amelia Cruises
    Industries
    Notable Project

    A private equity firm hired Visualwebz to build a new website from scratch. Using Bluehost, the team developed and designed a website that met all requirements and added an interactive map feature, created a domain name, and set up various email addresses. Visualwebz efforts grew the client’s web presence, the site received positive feedback from users. The team was detailed and comprehensive in their approach to web development.

    “Their responsiveness is really important to us. They have other clients and projects, but we always felt like we were their only client.” — COO, Private Equity Firm

  • 10
    $5,000+
    10 - 49 Employees
    Seattle WA

    Conflare is a web development and design firm in Seattle. It was founded in 2004 and currently has 4 employees. Conflare provides web design and development, branding, digital strategy, and video production services mainly to small business clients.

    Clients
    Artisan Electric
    PhotoTC
    AME Commerce
    Foundry Law
    Industries
    Notable Project

    A jewelry company hired Conflare to update its Shopify website. Conflare built a new e-commerce website from scratch, including a custom "design your own ring" feature. It continues to perform site updates and add products. 

    "They’re honest. They’ve proven to be a very trustworthy partner, both initially and over the length of the project. They’re upfront with how they tackle the work." - Co-Founder, Jewelry Company

  • 11
    $5,000+
    2 - 9 Employees
    Shoreline WA

    VisionSnap is a design and development company based in Seattle, with an additional office in Phoenix, AZ. The team was founded in 1999. VisionSnap specializes in providing UX/UI design, web development, and web design services primarily for small and midmarket businesses.

    Clients
    Rulersmith
    GuerraWilson Group
    Valley National Bank of Arizona
    Midland Real Estate
    Industries
    Notable Project

    VisionSnap worked with this restaurant to build its website and take charge of its digital marketing campaigns. VisionSnap designed and developed the website to be more visually appealing with a high number of photos, ensured that it was optimized for Google searches, and implemented tracking capabilities.

    "The volume of emails, inquiries, and phone calls has doubled in the last couple of years." — Banquet Sales Manager, Restaurant

  • 12
    $10,000+
    10 - 49 Employees
    Medina WA

    A full-service digital design and development agency, Flower Press Creative Studio takes on mobile app, web, and custom software development projects. Founded in 2001, the small team of 6 is headquartered in Seattle and also has experience in UI/UX design.

    Clients
    Nike
    Disney
    SurveyMonkey
    Lipton
    Industries
    Notable Project

    A founder of a social meetup company needed help launching the business. Flower Press Creative Studio agreed to help, developing an iOS app and assisting with branding.

    “She was really good at taking my ideas and turning them into something usable. She’s easy to work with, as well as versatile. She has a way of remedying doubts clients might have about their ideas.” – Founder, Social Meetup App

  • 13
    $25,000+
    2 - 9 Employees
    Seattle WA

    Lunarbyte.io is a development agency based in Seattle. Since 2019, the 3-person team has built websites, custom software, and mobile apps for predominantly small businesses.  

    Clients
    Preflight Mitigator
    Dollar Flight Club
    Storytellers for Change LLC
    Industries
    Notable Project

    Lunarbyte.io developed payment systems, mailing solutions, and deliverability functionality for a flight deals platform. They also provided support with WordPress. The client's business more than doubled as a result. 

    "Everything they do is delivered well, and they aren’t stressed about the production process. Those are qualities you can’t buy." – COO, Flight Deals Platform

  • 14
    $1,000+
    10 - 49 Employees
    Redmond WA

    Designify is a web agency based in Redmond, Wash., and founded in 2017. With no more than 50 members, they specialize in web development, web design, and SEO solutions for small and mid-market businesses in the fields of business services, consumer products, and e-commerce.

    Clients
    Startline
    Chipmonk Consulting
    Center Source Inc
    Industries
    Notable Project

    Designify developed a WordPress website for a fitness company. The company needed a website to help better convert sales for their business. Designify developed a professional-looking platform that the company was satisfied with.

    “They understood all of the issues with the site without me having to tell them.” - CEO, Fitness Company

     

  • 15
    $1,000+
    10 - 49 Employees
    Seattle WA

    Digitegy is a digital agency that provides a mix of development and marketing services: software, web, and mobile app development, web design, SEO, PPC, and digital strategy. Founded in 2016, they have a small team of fewer than five employees.

    Clients
    Style Skool
    Bruchelle's;Bagel Bistro
    Greg Landscaping
    AA Derma Science
    Notable Project

    A small bagel restaurant tasked Digitegy with designing and developing a website. Digitegy accepted the challenge, launching the project by getting to know the client's needs, such as the most important information to include on the site, branding, and features. After completing the website, Digitegy transformed it into an app, so users could choose how they interact with the bagel restaurant.

    "Digitegy frequently reaches out to us with suggestions of how to make the site better. They help us much more than any company that we’ve ever worked with." – Owner, Bagel Restaurant 

  • 16
    $1,000+
    2 - 9 Employees
    Tacoma WA

    Grinev Software is a development company based in Federal Way, Wash. Their team was founded in 2007 and has around 10 employees. They primarily provide mobile app, web, and e-commerce development. 

    Clients
    Salesfolks, Inc.
    True Virtual Tours
    Syzeit
    FromTo.City
    Notable Project

    Grinev Software developed the frontend of an AWS-hosted sales firm's site. They created the tools and handled necessary customizations. The delivered work was a success and the project was productive. 

    "They were incredibly fun to work with. Life's too short to not work with people you like and respect." – Managing Director, Sales Firm

  • 17
    $1,000+
    2 - 9 Employees
    Seattle WA

     Headquartered in Seattle, Maintaingo is a development agency and site support service. The company was founded in 2016 and has under 10 employees. They specialize in web development, e-commerce, design, and SEO. 

    Clients
    Cambodia Tomorrow
    Cycle University
    Environmental Defense Fund
    Louroe Electronics
    Notable Project

    Maintaingo managed development for an advertising agency that works with multiple clients. The team worked collaboratively with end clients to design and build full sites according to specific requirements. 

    "They’re excellent - always cheerful, always positive, always staying on top of everything. They’re very responsive and communicate effectively." – Project Manager, Advertising Agency

  • 18
    $5,000+
    10 - 49 Employees
    Bellevue WA
    Truu Digital, a website development company, was established in 2012. The small Bellevue, Washington-based team provides web development, conversion optimization, CRM consulting and SI, digital strategy, and more.
    Industries
    Notable Project

    Truu Digital developed a website for a chiropractor practice. The team built and designed a new website with a more modern image.

    "They are up to date with technology, communicate well, and listen to your needs."

  • 19
    $10,000+
    2 - 9 Employees
    Olympia WA

    Tilladelse Marketing Agency is a full service marketing agency located in Olympia, Wash. Founded in 2018, they have a team of 3 employees who specialize in web design, PPC, e-commerce development, and web development for their clients
     

    Clients
    Bid Venues
    McSwain CPA
    Koelsch Construction
    Notable Project

    Tilladelse Marketing Agency provided web development and marketing services for an online auction platform. They built a WordPress website for the client, paying particular attention to the UX design. To promote the new site, they managed an email marketing campaign, provided SEO, and curated content on Facebook. The client’s new website has since received a positive response from users.

    “Our customers love the new website and its navigation. All of our feedback is positive.” – VP, Online Auction Platform
     

  • 20
    $5,000+
    10 - 49 Employees
    Seattle WA

    Steelsmith Haus LLC is an internet marketing agency in Seattle. Founded in 2010, Steelsmith Haus has about 8 employees that work with a range of clients. Services include SEO, content marketing, web design, and email marketing services.

    Clients
    StacheClip
    Starving Students
    UC Berkeley
    StemGenex
    Industries
    Notable Project

    Steelsmith Haus worked with this personal training website to build its new website and supplement it with SEO and PPC capabilities. Steelsmith Haus collaborated with the client to capture the client's brand and implement the most effective marketing strategies.

    "They manage expectations well, knowing things can come up. Communication has been key to our relationship." — Owner, Personal Training Website

  • 21
    $25,000+
    50 - 249 Employees
    Kirkland WA

    Heaven Solutions is an IT staff augmentation company founded in 2005. The company offers IT staff augmentation, application testing, custom software development, web development, and more and has a midsize team. The company is based in Kirkland, Washington; Iași, Romania; Bensheim, Germany and Il-Gżira, Malta.

    Industries
    Notable Project

    Heaven Solutions has aided the custom software development efforts for a streaming service provider's delivery system. They continue to support the platform by implementing enhancements and system integrations.

    "Heaven Solutions is a results-oriented team that strives to deliver optimal results."

  • 22
    $5,000+
    50 - 249 Employees
    Redmond WA
    Citizen, Inc. Is a midsize UX company. Founded in 2005, the agency is based in Portland, Oregon and Redmond, Washington. Their team specializes in ux/ui design, mobile app development, web development, digital strategy, and more.
    Industries
  • 23
    Undisclosed
    2 - 9 Employees
    Seattle WA
    NOTEBLEU is a web design agency and website development company. Established in 2009, the small firm is in Seattle, Washington. Their services include web design and web development.
  • 24
    $5,000+
    50 - 249 Employees
    Bellevue WA
    Tech Pathway is a web development firm. Established in 2017, the midsize agency is located in Jaipur, India and Bellevue, Washington. Their team focuses on web development, mobile app development, and e-commerce development.
    Industries
  • 25
    $50,000+
    50 - 249 Employees
    Seattle WA
    Launched in 2009, GenUI is a cloud consulting & SI company. The company offers cloud consulting & SI, mobile app development, web development, ux/ui design, and more and has a midsize team. The company is based in Seattle, Washington.
    Industries
  • 26
    Undisclosed
    2 - 9 Employees
    Poulsbo WA
    Based in Poulsbo, Washington, Fusion Creative Works is a graphic design agency. The small team provides graphic design, logo, search engine optimization, web design, and more. The firm was launched in 2006.
  • 27
    $100,000+
    50 - 249 Employees
    Seattle WA
    Carbon Five is a software development firm. Established in 2000, the midsize company is located in San Francisco, California; Santa Monica, California; Chattanooga, Tennessee and New York, New York. Their services include custom software development, mobile app development, web development, web design, and more.
    Industries
  • 28
    $25,000+
    2 - 9 Employees
    Seattle WA
    Gigantic is a web design agency founded in 2020. The agency specializes in web design, ux/ui design, web development, branding, and more and has a small team.
  • 29
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    Undisclosed
    2 - 9 Employees
    Puyallup WA
    Web design agency BlueDenham WEB Design & Hosting was founded in 1989. They are in Puyallup, Washington and have a small team. BlueDenham WEB Design & Hosting specializes in web design, web development, graphic design, and IT managed services.
  • 30
    $75,000+
    50 - 249 Employees
    Seattle WA
    TangoTeams is an app development company. Established in 2021, the team provides mobile app development, web development, custom software development, and other application development. Their midsize firm is Seattle, Washington-based.
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