Top 60 JavaScript Development Companies in Seattle

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Top 60 JavaScript Development Companies in Seattle

The Best of March 2024

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. 

List of the Best Seattle JavaScript Developers

  • 1
    (69 Reviews) 4.9
    • Timeliness

      4.9
    • Service Excellence

      4.9
    • Value

      4.9
    • Would Recommend

      5.0
    • $5,000+
    • 50 - 249 employees
    • Seattle, WA

    UPQODE is a website design and development agency based in Nashville, Tennessee. Founded in 2015, the team of 40+ specializes in web development, web design, and e-commerce development. They work with small businesses, focusing on information technology, e-commerce, and business services.

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    Clients

    • Think Tank Team - Samsung Research America
    • SAA - Spondylitis Association of America
    • AmeriFreight Inc.
    • DOXO Inc.

    Industries

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  • 2
    (30 Reviews) 5.0
    • Timeliness

      4.9
    • Service Excellence

      5.0
    • Value

      4.9
    • Would Recommend

      5.0
    • $25,000+
    • 10 - 49 employees
    • Seattle, WA

    Founded in 2010 in Seattle, Billberry is a software development studio creating custom software, web apps, and digital products in partnership with some of the world's biggest brands. They have a veteran team of fewer than 50 strategists, designers, and developers who work in partnership with clients to help them grow, innovate, and move their businesses forward. Clients include businesses of all sizes in various industries, including business services, consumer products and services, and financial services.

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    Clients

    • Days for Girls
    • Snohomish County Public Utilities
    • Impinj
    • The Live You Can Save

    Industries

  • 3
    (8 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      5.0
    • Would Recommend

      5.0
    • $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.

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    Clients

    • 24 Hour Fitness
    • Audinate
    • Ballet Austin
    • Belmont Stakes / NYRA

    Industries

  • 4
    (1 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      4.5
    • Would Recommend

      5.0
    • Undisclosed
    • 50 - 249 employees
    • Seattle, WA

    Founded in 2000, Blink UX has almost 20 years of experience in the IT sector. True to their name, Blink UX specializes in UX/UI design but also offers mobile and web development, research, strategy, and design services.

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    Clients

    • Amazon
    • NASA
    • Apple
    • Disney

    Industries

  • 5
    (8 Reviews) 5.0
    • Timeliness

      4.9
    • Service Excellence

      5.0
    • Value

      4.9
    • Would Recommend

      5.0
    • $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.  

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    Clients

    • DDM Imports
    • Clean the Scene
    • Preflight Mitigator
    • Dollar Flight Club

    Industries

  • 6
    (65 Reviews) 4.8
    • Timeliness

      4.7
    • Service Excellence

      4.8
    • Value

      4.6
    • Would Recommend

      4.7
    • $10,000+
    • 2 - 9 employees
    • Seattle, WA

     Sayenko Design is a web design and development agency that specializes in the Shopify platform. The company has about four employees and was founded in 2009. Based in Seattle, Sayenko Design supports small- to medium-sized businesses. They focus on WordPress, PHP, and SQL. Other services include online marketing, branding.   

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    Clients

    • Erickson
    • Defined Crowd
    • Icertis
    • LinkedIn

    Industries

  • 7
    (20 Reviews) 4.9
    • Timeliness

      4.9
    • Service Excellence

      4.9
    • Value

      4.8
    • Would Recommend

      5.0
    • $25,000+
    • 2 - 9 employees
    • Seattle, WA

    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. 

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    Clients

    • UC Berkeley (Berkeley, CA)
    • UCSF (San Francisco, CA)
    • Monterey Bay Aquarium (Monterey, CA)
    • Fujitsu Laboratories Of America (Sunnyvale, CA)

    Industries

  • 8
    (16 Reviews) 5.0
    • Timeliness

      4.9
    • Service Excellence

      5.0
    • Value

      4.9
    • Would Recommend

      5.0
    • $5,000+
    • 10 - 49 employees
    • Seattle, WA

    Codersh Web Services is a web agency based in Ahmedabad, India, and founded in 201. With no more than 10 experts, they specialize in web design, web development, and mobile app development services for small firms in the industries of business and IT services, among others.

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    Clients

    • Reinventu Pro
    • Redesign Hub
    • Vidste
    • Bahia Days

    Industries

  • 9
    (30 Reviews) 4.9
    • Timeliness

      4.8
    • Service Excellence

      4.9
    • Value

      4.8
    • Would Recommend

      4.9
    • $25,000+
    • 50 - 249 employees
    • Seattle, WA

    Mobcoder is a software development company based in Seattle. They also have an office in Noida, India. Founded in 2014, their team of 40 employees provides mobile app development, custom software, and web development services to its midmarket and small business clients. They also serve enterprise clients. 

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    Clients

    • General mills
    • Axisbank
    • State of Washington tourism
    • Motherson Group

    Industries

  • 10
    (44 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      5.0
    • Would Recommend

      5.0
    • $1,000+
    • 2 - 9 employees
    • Seattle, WA

    A digital marketer based in San Francisco, Randy McCabe offers SEO, PPC, and digital strategy services. They were founded in 2018.

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    Clients

    • Morgan Stanley
    • Huawei
    • NameSilo
    • RE/MAX

    Industries

  • 11
    (11 Reviews) 5.0
    • Timeliness

      4.9
    • Service Excellence

      5.0
    • Value

      5.0
    • Would Recommend

      5.0
    • $50,000+
    • 50 - 249 employees
    • Seattle, WA

    ThirstySprout is an outsourced development company headquartered in Seattle with an additional office in San Franciso. Founded in 2017, they currently have about 18 employees. They provide IT staff augmentation as well as custom software and web development services to primarily midmarket agencies in IT, e-commerce, and business services.

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    Clients

    • Rover.com
    • Jirav.com
    • Zillow
    • WeWork Labs

    Industries

  • 12
    (15 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      4.9
    • Would Recommend

      5.0
    • $5,000+
    • 10 - 49 employees
    • Seattle, WA

    Slashdev is a small software development company. The Winter Park, Florida-based company was established in 2021. Their services include custom software development, web development, mobile app development, wearable app development, and more.

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    Industries

  • 13
    (9 Reviews) 5.0
    • Timeliness

      4.5
    • Service Excellence

      5.0
    • Value

      4.9
    • Would Recommend

      5.0
    • $1,000+
    • 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.

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    Clients

    • Make-A-Wish Foundation
    • University of Washington
    • Leukemia and Lymphoma Society
    • Northwest Motorsport

    Industries

  • 14
    (15 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      5.0
    • Would Recommend

      5.0
    • $5,000+
    • 10 - 49 employees
    • Seattle, WA

    Seattle New Media is a website development agency based in Seattle. The agency, founded in 2006, has a team of less than ten that provides, among others, video production, web development, and mobile app development services to various companies and clients. 

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    Clients

    • Dr. Tracy
    • Clearview.ai

    Industries

  • 15
    (4 Reviews) 5.0
    • Timeliness

      4.9
    • Service Excellence

      5.0
    • Value

      4.8
    • Would Recommend

      5.0
    • $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.

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    Clients

    • Artisan Electric
    • PhotoTC
    • AME Commerce
    • Foundry Law

    Industries

  • 16
    (1 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      4.5
    • Would Recommend

      5.0
    • $10,000+
    • 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.

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    Industries

  • 17
    (3 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      5.0
    • Would Recommend

      5.0
    • $50,000+
    • 10 - 49 employees
    • Seattle, WA

    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.
     

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    Clients

    • Amazon
    • Bill & Melinda Gates Foundation

    Industries

  • 18
    (2 Reviews) 4.8
    • Timeliness

      4.8
    • Service Excellence

      4.8
    • Value

      4.3
    • Would Recommend

      5.0
    • $100,000+
    • 250 - 999 employees
    • Seattle, WA

    Founded in 2014, PYCOGroup is a development firm. Their team of around 370 employees is based in Brussels, with an additional office around the globe. They focus on custom software, web, and mobile app development.

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    Clients

    • Microsoft
    • American Express
    • Volkswagen
    • Coach

    Industries

  • 19
    (1 Reviews) 4.0
    • Timeliness

      4.0
    • Service Excellence

      4.0
    • Value

      3.0
    • Would Recommend

      4.0
    • $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.

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    Clients

    • Smithsonian Institution (National Museum of African American History & Culture
    • National Museum of Natural History and the National Zoo)
    • Global Impact
    • Patient Centered Outcomes Research Institute (PCORI)

    Industries

  • 20
    (3 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      5.0
    • Would Recommend

      5.0
    • $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.

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    Industries

  • 21
    (1 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      4.5
    • Would Recommend

      5.0
    • $25,000+
    • 50 - 249 employees
    • Bellevue, WA

    Redtech is a custom software development firm. They are located in Bellevue, Washington and have a midsize team. Their services include custom software development, non-voice bpo/back office services, digital strategy, web development, and more. The agency was established in 1995.

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  • 22
    (6 Reviews) 4.9
    • Timeliness

      4.8
    • Service Excellence

      4.9
    • Value

      4.9
    • Would Recommend

      5.0
    • $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.

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    Clients

    • Rudy's
    • naturewise
    • Elm Coffee Roasters
    • Holland America Line

    Industries

  • 23
    (1 Reviews) 5.0
    • Timeliness

      4.0
    • Service Excellence

      5.0
    • Value

      5.0
    • Would Recommend

      5.0
    • $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. 

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    Clients

    • University of Washington
    • Avvo
    • Whitepages
    • Behavioral Tech
  • 24
    (7 Reviews) 4.9
    • Timeliness

      4.9
    • Service Excellence

      4.9
    • Value

      5.0
    • Would Recommend

      5.0
    • $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.

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    Clients

    • Startline
    • Chipmonk Consulting
    • Center Source Inc

    Industries

  • 25
    (1 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      5.0
    • Would Recommend

      5.0
    • $1,000+
    • 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.

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    Clients

    • StacheClip
    • Starving Students
    • UC Berkeley
    • StemGenex

    Industries

  • 26
    (1 Reviews) 5.0
    • Timeliness

      5.0
    • Service Excellence

      5.0
    • Value

      4.5
    • Would Recommend

      5.0
    • $10,000+
    • 50 - 249 employees
    • Bellevue, WA

    Virtuosity Consulting, a custom software development firm, was launched in 2008. They are located in Bellevue, Washington and Navi Mumbai, India and have a midsize team. Their services include custom software development, IT managed services, enterprise app modernization, web development, and more.

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    Industries

  • 27
    (1 Reviews) 4.5
    • Timeliness

      5.0
    • Service Excellence

      4.5
    • Value

      4.5
    • Would Recommend

      4.5
    • Undisclosed
    • 2 - 9 employees
    • Seattle, WA

    Perception Builder is a small conversion optimization company in Seattle, Washington. Established in 2011, the team focuses on conversion optimization, search engine optimization, ux/ui design, and web development.

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    Industries

  • 28
    (0 Reviews)

    Not yet reviewed.

    • $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.
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    Industries

  • 29
    (23 Reviews) 4.9
    • Timeliness

      4.9
    • Service Excellence

      4.9
    • Value

      4.8
    • Would Recommend

      5.0
    • $25,000+
    • 10 - 49 employees
    • Seattle, WA

    Groove Jones is a mobile app, AR/VR, and custom software developer based in Dallas. Founded in 2015, this 10+ team of digital experts builds the interactive tools that give brands a competitive edge.

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    Clients

    • 3M
    • 7 Eleven
    • AT&T
    • Amazon

    Industries

  • 30
    (0 Reviews)

    Not yet reviewed.

    • $5,000+
    • 2 - 9 employees
    • Burien, WA

    Launched in 1998, Sandcastle Web Design and Development is a small web design agency based in Seattle, Washington. Their services include web design, custom software development, e-commerce development, and mobile app development.

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    Clients

    • Aviation Supplies & Academics
    • Auburn Dairy Products (Yami & Zoi Yogurts)
    • ZipFizz
    • Long Term Care Associates

    Industries

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