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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1$5,000+50 - 249 employeesSeattle, WAWeb design agency UPQODE was launched in 2015. They are based in Nashville, Tennessee; New York, New York; Tampa, Florida and Seattle, Washington and have a midsize team. UPQODE focuses on Web Design, Web Development, UX/UI Design, Custom Software Development, and more.Read More
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Gracenote - Entertainment ProvidersIndustries
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2$25,000+10 - 49 employeesSeattle, WACulture Foundry is a web design agency. They focus on Web Design, Web Development, Digital Strategy, Custom Software Development, and more and were established in 2010. Their small team is located in Seattle, Washington; Boulder, Colorado; Austin, Texas and Portland, Oregon.Read More
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24 Hour FitnessIndustries
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3$25,000+10 - 49 employeesSeattle, WAFounded in 2010, Bilberrry is a custom software development firm. They are in Seattle, Washington and have a small team. The firm offers Custom Software Development, IT staff augmentation, Web Design, Web Development, and more.Read More
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Days for GirlsIndustries
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4$5,000+250 - 999 employeesKirkland, WAEstablished in 2005, UKAD is an IT staff augmentation company. Their midsize team is located in Kirkland, Washington; Kraków, Poland; Kharkiv, Ukraine and Cesson-Sévigné, France and focuses on IT staff augmentation, E-Commerce Development, Low/No Code Development, Custom Software Development, and more.Read More
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AJ Produkter Ginza TargetAid EntitledToIndustries
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5$50,000+50 - 249 employeesSeattle, WAThirstySprout is an IT staff augmentation company. They are based in Seattle, Washington; San Francisco, California; Austin, Texas and Buenos Aires, Argentina and have a midsize team. The company provides IT staff augmentation, Generative AI, Custom Software Development, Web Development, and more.Read More
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Rover.comIndustries
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6$1,000+10 - 49 employeesSeattle, WAChopDawg.com is an application development firm. Their small team is located in Philadelphia, Pennsylvania; Smyrna, Georgia; Seattle, Washington and Boston, Massachusetts. The company specializes in Mobile App Development and Web Development. The company was launched in 2009.Read More
Clients
Alpha Paw Big Brothers Big Sisters Choice Home Warranty City of Peachtree Corners, GeorgiaIndustries
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7$10,000+50 - 249 employeesKirkland, WARead More
Founded in 2013, AccelOne is an artificial intelligence firm. They are headquartered in Kirkland, Washington; Buenos Aires, Argentina and Mission Viejo, California and have a midsize team. The firm offers Artificial Intelligence, Generative AI, IT managed services, IT staff augmentation, and more.
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XapoIndustries
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8$10,000+250 - 999 employeesBellevue, WARead More
Affirma Consulting is a custom software development firm established in 2001. Their midsize team is in Bellevue, Washington; Ahmedabad, India; Dublin, Ireland and Fayetteville, Arkansas. The firm focuses on Custom Software Development, AI Consulting, Generative AI, Mobile App Development, and more.
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MicrosoftIndustries
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9$25,000+250 - 999 employeesKirkland, WANearsure, a Nortal company is an IT strategy consulting company. They focus on IT strategy consulting, IT staff augmentation, IT managed services, Custom Software Development, and more and were founded in 2000. Their midsize team is headquartered in Montevideo, Uruguay; Kirkland, Washington; Envigado, Colombia and Sao Paulo, Brazil.Read More
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Health CatalystIndustries
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10$10,000+2 - 9 employeesSeattle, WARead More
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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EricksonIndustries
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11$25,000+50 - 249 employeesSeattle, WAMobcoder, an IT staff augmentation company, is located in Seattle, Washington; Cobham, England; Ghaziabad, India and Burnaby, Canada. The midsize company was launched in 2014. Their services include IT staff augmentation, Artificial Intelligence, UX/UI Design, BI & big data consulting & SI, and more.Read More
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General millsIndustries
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12$10,000+2 - 9 employeesSeattle, WARead More
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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13$25,000+10 - 49 employeesDallas, TXLaunched in 2015, Groove Jones is an AR/VR development company. Their small team is based in Dallas, Texas; Minneapolis, Minnesota; West Hollywood, California and Chicago, Illinois. Their team provides AR/VR development, Artificial Intelligence, Web Development, Mobile App Development, and more.Read More
Clients
3M AT&T American Heart Associaiton Charles SchwabIndustries
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14$5,000+10 - 49 employeesStockholm, SwedenRead More
Slashdev is a small custom software development firm based in Winter Park, Florida; London, England; Stockholm, Sweden and San Diego, California. They specialize in Custom Software Development, Web Development, Mobile App Development, IT staff augmentation, and more and were founded in 2020.
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15$25,000+2 - 9 employeesSeattle, WARead More
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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DDM ImportsIndustries
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16$25,000+2 - 9 employeesSeattle, WABlack Antelope, a website development company, was established in 2009. Headquartered in Seattle, Washington, their small team focuses on Web Development, UX/UI Design, Custom Software Development, E-Commerce Development, and more.Read More
Clients
UC Berkeley (Berkeley, CA)Industries
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17$1,000+10 - 49 employeesSeattle, WARead More
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
Make-A-Wish FoundationIndustries
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18$25,000+10 - 49 employeesMedina, WAFlower Press Interactive is a small user experience agency launched in 2001. Their team offers UX/UI Design, Mobile App Development, Custom Software Development, Web Development, and more. The company is located in Medina, Washington.Read More
Clients
Insurance LoungeIndustries
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19$5,000+10 - 49 employeesSeattle, WARead More
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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Dr. TracyIndustries
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20$5,000+10 - 49 employeesSeattle, WARead More
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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Artisan ElectricIndustries
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21$50,000+10 - 49 employeesSeattle, WARead More
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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AmazonIndustries
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22$25,000+2 - 9 employeesSeattle, WARead More
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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University of Washington -
23$5,000+10 - 49 employeesBellevue, WARead More
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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24$10,000+50 - 249 employeesBellevue, WARead More
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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25Undisclosed2 - 9 employeesSeattle, WARead More
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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26$10,000+10 - 49 employeesSeattle, WARead More
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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Rudy'sIndustries
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27Undisclosed50 - 249 employeesSeattle, WANTSprint LLC is a software development company. They are located in Seattle, Washington and have midsize team of experts. Their services include Custom Software Development and Web Development.Read More
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28$5,000+10 - 49 employeesBellevue, WARead More
Scalex Technology Solutions is a digital agency founded in Bellevue, Wash. in 2015 with fewer than 50 employees. They specialize in cloud consulting, mobile app development, and custom software development for clients in the fields of education, financial, and IT services.
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World VisionIndustries
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29$1,000+10 - 49 employeesRedmond, WARead More
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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StartlineIndustries
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30$1,000+10 - 49 employeesSeattle, WARead More
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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StacheClipIndustries
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