The Best JavaScript Developers in The Emerald City

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.

List of the Best Seattle JavaScript Developers

  • 1
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  • 2

    Esteemed

    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.

    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

    Former clients
    State of North Carolina
    U.S. Department of Veterans Affairs
    U.S. Department of Education
    Hasbro
    Washington Fish and Wildlife
    $ $ $ $ $
    equalizer $10,000+
    group250 - 999 Employees
    place Olympia, WA
    4.8
    4.8
    6 Clutch reviews
  • 3

    New Normal

    New Normal, founded in 2012, is a software services agency headquartered in Seattle. Their company consists of a team of 22 people who specialize in web development, mobile app development, and e-commerce development. While they mostly work with mid-market businesses, they also work with enterprise and small businesses. The businesses they work with are mostly in the advertising & marketing, e-commerce, and financial services industries.
     

    Notable Project

    New Normal provided design and development services for a gamification platform. The client needed to create the platform to increase sign-up for their airline client’s frequent flier program. New Normal created the platform, and integrated multiple features that the client wanted. After the company developed the platform, the airline received thousands of sign-ups, and the client launched more campaigns. 

    “With New Normal’s help, we were able to help the airlines get over 80,000 new sign-ups to its loyalty program in the month that contest ran. The success of this project allowed us to run two more similar campaigns for the client with New Normal as the software team.”

    — Director of Creative Services, Digital Marketing Agency
     

    Former clients
    Amazon
    Bill & Melinda Gates Foundation
    State of Washington
    $ $ $ $ $
    equalizer $10,000+
    group10 - 49 Employees
    place Seattle, WA
    5.0
    5.0
    2 Clutch reviews
  • 4

    Culture Foundry

    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.

    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

    Former clients
    24 Hour Fitness
    Audinate
    Ballet Austin
    $ $ $ $ $
    equalizer $25,000+
    group10 - 49 Employees
    place Seattle, WA
    5.0
    5.0
    4 Clutch reviews
  • 5

    Forum One

    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.

    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

    Former clients
    Smithsonian Institution
    Bill & Melinda Gates Foundation
    World Wildlife Fund
    Peace Corps
    American Red Cross
    $ $ $ $ $
    equalizer $5,000+
    group50 - 249 Employees
    place Seattle, WA
    4.0
    4.0
    1 Clutch review
  • 6

    Northwest Independent Ruby Development

    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. 

    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

    Former clients
    Inkd
    <strong>;</strong>University of Washington
    Expedia
    Whitepages
    $ $ $ $ $
    equalizer $25,000+
    group2 - 9 Employees
    place Seattle, WA
    5.0
    5.0
    1 Clutch review
  • 7

    Efinitytech

    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.

    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

    Former clients
    Barn Pros
    Bed Voyage
    Orthman
    Matheus Lumber
    Thrive Community Fitness
    VAP Construction
    $ $ $ $ $
    equalizer $5,000+
    group2 - 9 Employees
    place Monroe, WA
    4.9
    4.9
    12 Clutch reviews
  • 8

    Black Antelope

    Black Antelope is a digital creative industry headquartered in Seattle. It was founded in 2009 and has expanded to additional locations in Sacremento, Calif. and London. Black Antelope has about 3 employees that serve a range of enterprise and small- to mid-sized businesses. Services include custom software development, web development, and web design. 

    Notable Project

    Black Antelope redeveloped a website on a unified Drupal CMS to improve performance. The system includes translation modules for different coding languages. Initially, they provided design services before a third-party vendor assumed that responsibility. Subsequently, they focused on SEO and increased web traffic significantly. The site's faster speed and new professional look significantly improve site rankings. 

    "Despite significant peaks of traffic at times, the site never went down. Black Antelope helped us with initial SEO implementations, giving us core advice for this area. We definitely saw an uptick in Google search results."  – Director of Web Development, Tech Company

     

    Former clients
    UC Berkeley
    Monterey Bay Aquarium
    Fujitsu Laboratories of America
    Cloudwords
    SPCA International
    $ $ $ $ $
    equalizer $10,000+
    group2 - 9 Employees
    place Seattle, WA
    4.9
    4.9
    15 Clutch reviews
  • 9

    RNO1

    RNO1 is a digital design agency headquartered in California, with offices in Washington and Vancouver. Founded in 2007,  RNO1 has a team of less than 50 and specializes in UX/UI design, web design, web development, marketing strategy, branding, and SEO. 

    Notable Project

    RNO1 worked with an architecture firm to establish a stronger, more contemporary online presence. RNO1 designed a custom template through Squarespace and updated the firm's website. The firm's founder appreciated the presentation and design of the new site. 

    "I liked the look and feel of the work, and I liked the presentation of the company, but most importantly, I liked the people with whom I was connected. That really connected the dots for me. I was not on a campaign to do a lot of interviewing. I hire people who I know can perform." – Founder, Toby Long Design 

    Former clients
    Microsoft
    Airbnb
    Pet Paradise
    Clever Homes
    $ $ $ $ $
    equalizer

    Undisclosed

    group50 - 249 Employees
    place Seattle, WA
    4.7
    4.7
    5 Clutch reviews
    Awards

    Agency Spotter: Top 20 Branding Agencies

  • 10

    Hero Creative

    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.

    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
     

    Former clients
    Crescent Down Works
    Greystar
    Avenue 5
    Leukemia and Lymphoma Society
    $ $ $ $ $
    equalizer $5,000+
    group10 - 49 Employees
    place Seattle, WA
    5.0
    5.0
    9 Clutch reviews
  • 11

    Helpful Human

    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.

    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 

    Former clients
    Rudy's
    naturewise
    Elm Coffee Roasters
    Holland America Line
    $ $ $ $ $
    equalizer $10,000+
    group10 - 49 Employees
    place Seattle, WA
    5.0
    5.0
    2 Clutch reviews
  • 12

    Visualwebz, LLC

    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.

    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

    Former clients
    NW Ambulance
    Animal Psychology Center
    Top Ten Golf Products
    Amelia Cruises
    $ $ $ $ $
    equalizer $1,000+
    group2 - 9 Employees
    place Seattle, WA
    5.0
    5.0
    20 Clutch reviews
  • 13

    VisionSnap, Inc.

    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.

    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

    Former clients
    Rulersmith
    GuerraWilson Group
    Valley National Bank of Arizona
    Midland Real Estate
    $ $ $ $ $
    equalizer $5,000+
    group2 - 9 Employees
    place Seattle, WA
    4.9
    4.9
    5 Clutch reviews
  • 14

    Y-Designs, Inc

    Founded in 2010, Y-Designs’ small but powerful team of 3 offers design and development for mobile apps, websites, and other digital products. Based in Seattle, the team serves local small businesses.

    Notable Project

    Y-Designs built a web application and iOS and Android apps for a tech startup. The client originally hired Y-Designs for their design expertise but was impressed with their engineering talent, efficiency, and amiability.

    “I can really say that Y-Designs can move the ball faster and harder than even a team of 30 engineers at a very large, well-established corporation. That’s  because they know so much about the technology landscape.” – CEO, Tech Startup

    Former clients
    Vetri Glass
    Seattleite Guide
    Content26
    Conlon Dart
    $ $ $ $ $
    equalizer $25,000+
    group2 - 9 Employees
    place Seattle, WA
    5.0
    5.0
    4 Clutch reviews
  • 15

    Conflare

    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.

    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

    Former clients
    Artisan Electric
    PhotoTC
    AME Commerce
    Foundry Law
    Harris Moure
    $ $ $ $ $
    equalizer $5,000+
    group10 - 49 Employees
    place Seattle, WA
    5.0
    5.0
    3 Clutch reviews
  • 16

    Kelsus

    Kelsus has been providing clients with software engineering teams to small businesses in the education, business services, and consumer product service industries since 2008. With a team of 50 in offices around the Colorado, Buenos Aires, Duvall, and Argentina areas, they help clients publish content, social strategy, and software development.

    Notable Project

    Kelsus partnered with pet-owner social media company to design, create the application, and build an algorithm for a weekly competition to feature owners pets. The results were 20,000 users and over 30,000 pets on the platform with Kelsus app development.

    “I can’t say enough positive things about them. Rather than just building whatever we ask of them, Kelsus has been very helpful about leading us through the development process. As a self-funded startup, we don’t always know what we’re building, so they advise us on the most efficient ways to proceed.” – Co-Founder & CEO, ZooPix

    Former clients
    Sphero
    Equifax
    Zoopix
    DigitalTown
    Chatbunker
    Intel
    $ $ $ $ $
    equalizer $50,000+
    group10 - 49 Employees
    place Duvall, WA
    4.7
    4.7
    3 Clutch reviews
  • 17

    Flower Press Creative Studio, LLC

    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.

    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

    Former clients
    Nike
    Disney
    SurveyMonkey
    Lipton
    Southern Living
    $ $ $ $ $
    equalizer $5,000+
    group10 - 49 Employees
    place Medina, WA
    4.9
    4.9
    17 Clutch reviews
  • 18

    Designify

    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.

    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

     

    Former clients
    Startline
    Chipmonk Consulting
    Center Source Inc
    $ $ $ $ $
    equalizer $1,000+
    group10 - 49 Employees
    place Redmond, WA
    4.9
    4.9
    7 Clutch reviews
  • 19

    Digitegy

    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.

    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 

    Former clients
    Style Skool
    Bruchelle's;Bagel Bistro
    Greg Landscaping
    AA Derma Science
    $ $ $ $ $
    equalizer $1,000+
    group10 - 49 Employees
    place Seattle, WA
    5.0
    5.0
    3 Clutch reviews
  • 20

    Kind+Human

    Founded in 2018, Kind+Human is a small development firm. Their team is based in Los Angeles, with an additional office in San Francisco and Seattle. They focus on custom software, web, and mobile app development.

    Notable Project

    Kind+Human provided UI/UX designs for an automotive digital company. The team created custom and modernized layouts and flows.

    "Their creativity stands out." – CTO, Automotive Digital Company

    Former clients
    Dataship
    Munch Citi
    Woolly Labs
    $ $ $ $ $
    equalizer $10,000+
    group10 - 49 Employees
    place Seattle, WA
    5.0
    5.0
    3 Clutch reviews
  • 21

    Lunarbyte.io

    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.  

    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

    Former clients
    Preflight Mitigator
    Dollar Flight Club
    Storytellers for Change LLC
    $ $ $ $ $
    equalizer $25,000+
    group2 - 9 Employees
    place Seattle, WA
    5.0
    5.0
    7 Clutch reviews
  • 22

    Grinev Software

    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. 

    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

    Former clients
    Salesfolks, Inc.
    True Virtual Tours
    Syzeit
    FromTo.City
    TechService, LTD
    $ $ $ $ $
    equalizer $1,000+
    group2 - 9 Employees
    place Tacoma, WA
    5.0
    5.0
    1 Clutch review
  • 23

    Maintaingo

     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. 

    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

    Former clients
    Cambodia Tomorrow
    Cycle University
    Environmental Defense Fund
    Louroe Electronics
    PhaseRx
    $ $ $ $ $
    equalizer $1,000+
    group2 - 9 Employees
    place Seattle, WA
    5.0
    5.0
    2 Clutch reviews
  • 24

    Tilladelse Marketing Agency

    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
     

    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
     

    Former clients
    Bid Venues
    McSwain CPA
    Koelsch Construction
    $ $ $ $ $
    equalizer $10,000+
    group2 - 9 Employees
    place Olympia, WA
    5.0
    5.0
    1 Clutch review
  • 25

    Steelsmith Haus, LLC

    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.

    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

    Former clients
    StacheClip
    Starving Students
    UC Berkeley
    StemGenex
    $ $ $ $ $
    equalizer $5,000+
    group10 - 49 Employees
    place Seattle, WA
    5.0
    5.0
    1 Clutch review
  • 26

    Inside Edge

    Inside Edge is a marketing firm based in Mill Creek, Wash. with over two employees. Since their founding in 2008, they have offered media planning and buying, PPC, and SEO solutions for small businesses in the fields of consumer products, legal services, and more.

    Notable Project

    Inside Edge provided marketing and SEO solutions for a home maintenance service. The partnership with the service still continues to this day. This has helped the service grow significantly.

    “Very knowledgeable about the home service business industry.” - Owner, Home Maintenance Service

    Former clients
    Emerald State LLC
    $ $ $ $ $
    equalizer $1,000+
    group2 - 9 Employees
    place mill creek, WA
    4.5
    4.5
    1 Clutch review
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