Top 80 JavaScript Development Companies in Seattle
The Best of December 2025Looking 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
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31$1,000+10 - 49 employeesSeattle, WATekByt LLC is a web design agency established in 2024. They are in Seattle, Washington and have a small team. Their services include Web Design, UX/UI Design, Custom Software Development, Web Development, and more.Read More
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32$5,000+50 - 249 employeesSeattle, WARead More
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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Smithsonian Institution (National Museum of African American History & CultureIndustries
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33$5,000+2 - 9 employeesBurien, WASandcastle Web Design and Development is a software development company established in 1998. The team specializes in Custom Software Development and Mobile App Development.Read More
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Aviation Supplies & Academics Cevala / Brandvia Allegiant Commercial Asset Services GroupIndustries
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34$5,000+50 - 249 employeesBellevue, WAMidsize mobile application development firm Tech Pathway, is in Jaipur, India and Bellevue, Washington. Their services include Mobile App Development and Web Development.Read More
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35$25,000+50 - 249 employeesKirkland, WARead More
WOLFPACK DIGITAL, a web development company, is headquartered in Cluj-Napoca, Romania; Dublin, Ireland and Kirkland, Washington. Launched in 2015, the midsize team focuses on Web Development, Mobile App Development, and Artificial Intelligence.
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Walgreens Boots Alliance Abbvie Corrib Oil SephoraIndustries
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36$100,000+50 - 249 employeesSeattle, WALaunched in 2000, Carbon Five is a custom software development company. Their team specializes in Custom Software Development and Mobile App Development.Read More
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37$10,000+50 - 249 employeesSeattle, WADevblock is a software development company. Based in Seattle, Washington and Ho Chi Minh, Vietnam, the company offers Custom Software Development and Web Development.Read More
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38$10,000+10 - 49 employeesSeattle, WAPalador is a small custom software development firm headquartered in Seattle, Washington and Yogyakarta, Indonesia. Their services include Custom Software Development and Enterprise App Modernization.Read More
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39$50,000+50 - 249 employeesSeattle, WACloud consulting & SI company GenUI was launched in 2009. The midsize team focuses on cloud consulting & SI and Mobile App Development.Read More
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40$5,000+10 - 49 employeesSeattle, WACommand Media is a website development company established in 2005. The small team provides Web Development and Web Design.Read More
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41Undisclosed10 - 49 employeesSeattle, WAPivotal Consulting, a cloud consulting & SI company, is based in Seattle, Washington. The team offers cloud consulting & SI and Enterprise App Modernization.Read More
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42$10,000+10 - 49 employeesSeattle, WABranding agency Zipline B2B Marketing was founded in 2005. The agency provides Branding and Digital Strategy, and is small.Read More
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43$75,000+50 - 249 employeesSeattle, WATangoTeams, a midsize website development company, is in Seattle, Washington. Their services include Web Development and Mobile App Development.Read More
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44$1,000+2 - 9 employeesSeattle, WASeaMonster Studios, a web development firm, was launched in 2007. In Seattle, Washington, the team focuses on Web Development and UX/UI Design.Read More
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45$1,000+2 - 9 employeesSeattle, WAUp n Up Global is a Marketing Strategy company. Established in 2019, the team provides Marketing Strategy and Pay Per Click.Read More
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46$1,000+2 - 9 employeesSeattle, WAS9 Digital is a branding company. Their small team is in Seattle, Washington. Their services include Branding and Content Marketing.Read More
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47$10,000+2 - 9 employeesKent, WAWinnComm, LLC is a software development company. They provide Custom Software Development and Web Development and are based in Jaipur, India and Kent, Washington.Read More
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48Undisclosed10 - 49 employeesMountlake Terrace, WASunshine Digital Solutions is a SEO company. The Mountlake Terrace, Washington-based company was founded in 2024. Their services include Search Engine Optimization and Pay Per Click.Read More
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49$10,000+50 - 249 employeesChicago, ILDMC, Inc., a custom software development firm, is based in Chicago, Illinois and Somerville, Massachusetts. The team provides Custom Software Development and CRM consulting and SI.Read More
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3MIndustries
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50$5,000+2 - 9 employeesSeattle, WAV37 is a custom software development company located in Seattle, Washington. Launched in 2022, the team specializes in Custom Software Development and Web Development.Read More
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51$5,000+2 - 9 employeesSeattle, WASuzanne Harrison, Web Design + Build is a web design company. The small Seattle, Washington-based team provides Web Design and Branding. The firm was established in 2012.Read More
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52$5,000+2 - 9 employeesShoreline, WARead More
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.
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RulersmithIndustries
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53Undisclosed2 - 9 employeesSeattle, WANOTEBLEU is a web design company and web development firm. The Seattle, Washington-based company was founded in 2009. Their team focuses on Web Design and Web Development.Read More
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54$1,000+10 - 49 employeesRedmond, WAWebtual Global Inc., a custom software development company, was founded in 2019. The company offers Custom Software Development and Enterprise App Modernization.Read More
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55Undisclosed2 - 9 employeesSeattle, WANanochord PVT, a Content Marketing company, was founded in 2024. They are headquartered in Seattle, Washington and have a small team. Their services include Content Marketing, Web Design, UX/UI Design, Graphic Design, and more.Read More
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56$10,000+2 - 9 employeesFederal Way, WANeurian is a web development firm established in 2022. The agency focuses on Web Development and Search Engine Optimization.Read More
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57$10,000+2 - 9 employeesBellevue, WAAstra, a web development company, offer Web Development and Mobile App Development. They were established in 2022.Read More
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58$1,000+10 - 49 employeesKent, WAEstablished in 2021, DigiCorders is a social media marketing firm. The team provides Social Media Marketing and Content Marketing.Read More
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59Undisclosed2 - 9 employeesSeattle, WATaliferro Group is a cloud consulting & SI company. The Seattle, Washington-based firm was established in 2020. Their services include cloud consulting & SI and Web Development.Read More
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60$1,000+Freelancer employeesLynnwood, WADesign Detective is a small web design company and website development firm located in Lynnwood, Washington. Their services include Web Design and Web Development.Read More
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