Top 50 JavaScript Development Companies in Seattle

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Top 50 JavaScript Development Companies in Seattle

August 2022

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
    • $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.  

    Clients

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

    Industries

    Notable Project

    Lunarbyte.io developed software programs for a testing firm. They met with their client’s multiple times to outline the project. Since then, they’ve troubleshot problems and fixed bugs as needed.

    “They usually complete the task within 24-hours or by the end of the week.”

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  • 2
    • $10,000+
    • 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. 

    Clients

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

    Industries

    Notable Project

    A college university hired Black Antelope to migrate their website into a new platform and enhance their backend framework. The goal is to design and develop a new website for a specific school program.

    "The design aspect is fast, efficient, and top-notch."

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  • 3
    • Scheduling

      4.8
    • Quality

      5.0
    • Cost

      5.0
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $25,000+
    • 50 - 249 employees
    • Bellevue, WA

    MSOFT (formerly MediaSoft.team) is a Washington State, software development firm with an office in Bellevue, Seattle area. Founded in 2014, MSOFT (formerly MediaSoft.team) team of over 270 employees specializes in custom software, website, and mobile app development for enterprise clients. MSOFT (formerly MediaSoft.team) has partners in a variety of industries including Retail, GameDev, and FinTech.

    Clients

    • Zdravcity
    • CarPrice
    • Moio Delo
    • Svaznoy Travel

    Industries

    Notable Project

    MSOFT (formerly MediaSoft.team) developed a mobile app, as well as the technology to connect a vast database of content to the app. They also implemented the graphic design.

    "During the development process, they came up with a number of new ideas that greatly improved the app."

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  • 4
    • Scheduling

      5.0
    • Quality

      5.0
    • Cost

      5.0
    • NPS

      5.0
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    • $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.

    Clients

    • Off Leash K9 Training
    • NameSilo
    • COMRAD
    • EnGarde® Body Armor

    Industries

    Notable Project

    A wellness company hired Exo Agency to develop a WhatsApp-like app. The team handled the UI/UX design tasks and developed various features such as messaging, payment gateway, booking, and subscription services. 

    "The team does not beat around the bush; they convey everything honestly."

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  • 6
    • $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.

    Clients

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

    Industries

    Notable Project

    Culture Foundry was hired by a racing association to update their site's structure, design, and backend setup. The team now conducts regular audits to help improve customer experience on the site's front end.

    "Culture Foundry's team members are committed to working together to help achieve our business goals."

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  • 7
    • Scheduling

      4.9
    • Quality

      4.9
    • Cost

      4.9
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $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.

    Clients

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

    Industries

    Notable Project

    Bilberrry designed and developed a website that was part of a survey research project regarding the user experience's of various website modules and operations. The HTML site was designed to specifications. 

    "We got exactly what we expected the first time they delivered." 

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  • 8
    • $10,000+
    • 10 - 49 employees
    • Medina, WA

    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.

    Clients

    • Insurance Lounge
    • Brown Bear Car Wash
    • Geek Girl Careers
    • World Perspectives

    Industries

    Notable Project

    A medical device firm had an outdated site, and they hired Flower Press Creative Studio, LLC to create their WordPress site. The site featured the company's description, contact form, and downloadable brochure.

    "Their efficiency was their strong point."

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

    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.

    Clients

    • TimeXtender
    • Mitsubishi
    • Fuso
    • PGTAA

    Industries

    Notable Project

    Visualwebz, LLC provided web redesign and redevelopment for a nonprofit organization. The client wanted their platform to continue a smooth flow as they expanded services.

    "They gave us a great website on a new CMS platform."

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  • 10
    • $5,000+
    • 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.

    Clients

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

    Industries

    Notable Project

    Hero Creative offers full-service creative for a property management firm’s clients. Their support spans video production, website development, creative strategy, and branding.

    “They’re a fun group to work with, and their deliverables are top-notch.”

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  • 11
    • Scheduling

      4.9
    • Quality

      5.0
    • Cost

      4.8
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $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.

    Clients

    • Artisan Electric
    • PhotoTC
    • AME Commerce
    • Foundry Law

    Industries

    Notable Project

    Conflare assisted an aerospace firm with their design, web development, and brand messaging. They collected data, built a modern WordPress site, and created new color palettes and templates.

    “Their overall creativity is impressive.”

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  • 12
    • Scheduling

      4.0
    • Quality

      4.0
    • Cost

      3.0
    • NPS

      4.0
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    • $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.

    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

    Notable Project

    In order to prepare a large museum for its opening, Forum One built a Drupal 7 site within institutional infrastructure, with strong SEO and consistent UX across a variety of devices.

    “They brought a lot of experience from different clients across a variety of sectors, and we’ve benefited from that.”

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  • 13
    • Scheduling

      5.0
    • Quality

      5.0
    • Cost

      4.5
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $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.

    Notable Project

    Redtech provided BI and analytics for a software company. They redesigned a learning catalog and supported in understanding its current status.

    "Their subject matter expertise and professionalism were impressive."

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  • 14
    • $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.

    Clients

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

    Industries

    Notable Project

    Helpful Human provides custom software development services for an aerospace consulting services company. They are helping the client develop an advanced production scheduling software.

    "They are highly dynamic and have a great level of technical knowledge to support our requirements."

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  • 15
    • $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. 

    Clients

    • University of Washington
    • Avvo
    • Whitepages
    • Behavioral Tech

    Notable Project

    NIRD provided resources to help bring the Linehan Suicide Safety Net to market. They made the online software HIPAA compliant and reworked the backend to make it more stable.

    "NIRD helped us get our program in a place where it was healthy and functioning the way it should be."

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  • 16
    • Scheduling

      5.0
    • Quality

      5.0
    • Cost

      4.5
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $25,000+
    • 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.

    Notable Project

    An advertising agency was looking to rebrand their image and online presence, so they engaged with Gigantic to provide them with web development, SEO management, and marketing campaigns and strategies.

    "They delivered above and beyond what we were expecting."

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  • 17
    • Scheduling

      5.0
    • Quality

      5.0
    • Cost

      5.0
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $1,000+
    • 2 - 9 employees
    • Seattle, WA

     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. 

    Clients

    • Institute for Systems Biology
    • WorkCare
    • GLP Attorneys
    • Louroe Electronics

    Notable Project

    Maintaingo maintains and updates a novelty goods e-commerce site. The team initially transferred and customized the site on WordPress. They also integrated the site with Etsy and now manage marketing.

    "Maintaingo always keeps in touch with me about what they’re doing, how long it’s taking them, and what it’s costing."

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  • 18
    • Scheduling

      4.9
    • Quality

      4.9
    • Cost

      5.0
    • NPS

      5.0
    Read Full Reviews on Clutch Visit Site
    • $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.

    Clients

    • Startline
    • Chipmonk Consulting
    • Center Source Inc

    Industries

    Notable Project

    Designify recreated a legacy website with the aim of improving its functionality and visual appeal. This involved creating new features for the platform.

    "The Designify team took my poorly designed website and turn it into a modern and attractive expression of my company."

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  • 19
    • $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.

    Industries

    Notable Project

    Truu Digital developed a website for a chiropractor practice. The team built and designed a new website with a more modern image.

    "They are up to date with technology, communicate well, and listen to your needs."

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  • 20
    • $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.

    Clients

    • StacheClip
    • Starving Students
    • UC Berkeley
    • StemGenex

    Industries

    Notable Project

    Steelsmith Haus built a new website and subsequently created a marketing strategy. Post-launch, they’ve provided SEO and PPC.

    "The team does a phenomenal job with web development and marketing."

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  • 21
    • 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.

    Industries

    Notable Project

    Perception Builder has been hired by a power sweeping company to update their website, develop new marketing strategies, provide SEO services, and create content for the website's overall improvement.

    "We were impressed by their technical capabilities."

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  • 22
    • $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.

    Industries

    Notable Project

    A software company hired Virtuosity Consulting for staff augmentation. The team supplied qualified process-driven and self-motivated managers for early planning, daily execution, monthly releases, and more. 

    "The agency and the candidates they supplied really took ownership of the project."

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  • 23
    • Scheduling

      4.8
    • Quality

      4.9
    • Cost

      4.9
    • NPS

      4.9
    Read Full Reviews on Clutch Visit Site
    • $10,000+
    • 50 - 249 employees
    • Seattle, WA

    Five Jars, a web development firm, was established in 2017. Their small team is in Dover, Delaware and Kyiv, Ukraine. Their services include web development, custom software development, and web design.

    Clients

    • George Washington’s Mount Vernon
    • YMCA of the North
    • Council for Exceptional Children
    • YMCA of Greater Brandywine

    Industries

    Notable Project

    Five Jars is a long-standing partner for a nonprofit organization's web development projects. Their most recent project was a Drupal directory of current staff and HRIS integration.

    "The Five Jars team is thoughtful, resourceful, and open to feedback and input."

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  • 24
    • Undisclosed
    • 2 - 9 employees
    • Seattle, WA

    NOTEBLEU is a web design agency and website development company. Established in 2009, the small firm is in Seattle, Washington. Their services include web design and web development.

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  • 25
    • $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.

    Industries

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  • 26
    • $50,000+
    • 50 - 249 employees
    • Seattle, WA

    Launched in 2009, GenUI is a cloud consulting & SI company. The company offers cloud consulting & SI, mobile app development, web development, ux/ui design, and more and has a midsize team. The company is based in Seattle, Washington.

    Industries

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  • 27
    • $100,000+
    • 50 - 249 employees
    • Seattle, WA

    Carbon Five is a software development firm. Established in 2000, the midsize company is located in San Francisco, California; Santa Monica, California; Chattanooga, Tennessee and New York, New York. Their services include custom software development, mobile app development, web development, web design, and more.

    Industries

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  • 28
    • $10,000+
    • 10 - 49 employees
    • Seattle, WA

    Zipline B2B Marketing is a content marketing company. They are headquartered in Seattle, Washington; Spokane, Washington; Vancouver, Washington and Boise, Idaho and have a small team. Their services include content marketing, digital strategy, search engine optimization, web design, and more. The company was launched in 2005.

    Industries

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  • 29
    • $75,000+
    • 50 - 249 employees
    • Seattle, WA

    TangoTeams is an app development company. Established in 2021, the team provides mobile app development, web development, custom software development, and other application development. Their midsize firm is Seattle, Washington-based.

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  • 30
    • $1,000+
    • 2 - 9 employees
    • Seattle, WA

    SeaMonster Studios is a website development firm. The small Seattle, Washington-based company was founded in 2007. Their team specializes in web development, ux/ui design, e-commerce development, web design, and more.

    Industries

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