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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61$5,000+2 - 9 employeesEverett, WARead More
Jordan Crown is a nationally known firm based in Seattle, WA. Founded in 2008, their tight-knit team of 11 specializes in creating beautiful websites in the construction, technology, manufacturing, and consulting industries.
Clients
Compass HealthIndustries
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62$5,000+2 - 9 employeesMonroe, WARead More
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
Safe ConsultingIndustries
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63$1,000+Freelancer employeesEverett, WAEasy Biz Tech LLC is a Conversion Optimization company established in 2021. Located in Everett, Washington, the team offers Conversion Optimization and Search Engine Optimization.Read More
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64$1,000+2 - 9 employeesSeattle, WAProduct Marketing company ProductColab was established in 2023. The team specializes in Product Marketing and Content Marketing and is in Seattle, Washington.Read More
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65Undisclosed2 - 9 employeesSeattle, WABusiness 2 Virtual LLC is a Back Office Outsourcing company. They are based in Seattle, Washington and have small team. They focus on Back Office Outsourcing and Engineering.Read More
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66Undisclosed2 - 9 employeesPoulsbo, WAFusion Creative Works is a small Poulsbo, Washington-based graphic design agency. The team offers Graphic Design and Logo.Read More
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67$1,000+2 - 9 employeesTacoma, WARead More
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
grinev.softwareIndustries
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68$1,000+Freelancer employeesLake Tapps, WAEstablished in 2010, Empac Design is a Marketing Strategy company. The agency offers Marketing Strategy and Web Design, and is small.Read More
Clients
Dr. Tarak Patel Olympic Energy LLC BL TowingIndustries
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69$10,000+10 - 49 employeesArlington, WAFDG Web, Inc is a web design company established in 2000. Based in Arlington, Washington, the team provides Web Design and Web Development.Read More
Industries
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70Undisclosed2 - 9 employeesPuyallup, WASmall web design company BlueDenham WEB Design & Hosting, is based in Puyallup, Washington. Their services include Web Design and Web Development.Read More
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71$5,000+2 - 9 employeesSouth Hill, WAWeb design company Undraft'd Studio was founded in 2022. The firm provides Web Design and Branding, and is small.Read More
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72$5,000+10 - 49 employeesMarysville, WARead More
Small graphic design company Hybrid Mediaworks, is based in Islamabad, Pakistan. The team focuses on graphic design, social media marketing, video production, and web design.
Clients
Best Bronze Home Delivery BR Herco Freight Forwarders Pocket TeacherIndustries
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73$10,000+2 - 9 employeesOlympia, WARead More
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 |Industries
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74$1,000+10 - 49 employeesBellevue, WARead More
Fractional CMO is a marketing automation agency with offices in Hyderabad, India and Seattle. Founded in 2017, they comprise 13 employees specializing in content marketing, social media, lead generation, SEO, online branding, and CRM. They work with small and midmarket businesses, primarily in IT, real estate, and manufacturing.
Clients
AvisoIndustries
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75$5,000+2 - 9 employeesBothell, WARavenna is a website development company headquartered in Bothell, Washington. The team offers Web Development and Mobile App Development.Read More
Industries
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76$5,000+50 - 249 employeesRedmond, WACitizen, Inc. Is an user experience design company. Launched in 2005, the company is based in Portland, Oregon and Redmond, Washington. Their services include UX/UI Design and Mobile App Development.Read More
Industries
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