Top 100 JavaScript Development Companies in San Francisco
The Best of October 2026Looking for a top JavaScript developer in San Francisco?
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 San Francisco. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best San Francisco JavaScript Developers
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1$50,000+1,000 - 9,999 employeesSan Francisco, CAVention is an artificial intelligence firm. Founded in 2002, the company is based in New York, New York; London, England; Marietta, Georgia and San Francisco, California. The large team focuses on Artificial Intelligence, Custom Software Development, Enterprise App Modernization, cloud consulting & SI, and more.Read More
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IBM PayPal pwc IC MarketsIndustries
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2$50,000+1,000 - 9,999 employeesSan Francisco, CARead More
Toptal is a private network of freelance technologists and designers. With more than 2000 freelance workers in its exclusive community, Toptal can be instrumental in finding the right freelance partner for development projects. The community includes developers for any platform, finance experts, and designers of both visual material and graphic interfaces. Because of its screening process, Toptal combines the reliability and expertise of an agency with the flexibility and affordability of freelance work.
Clients
Toptal clients include J.P. MorganIndustries
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3$10,000+250 - 999 employeesSan Francisco, CAGeekyAnts is an application development firm established in 2006. The firm provides Mobile App Development, Custom Software Development, Artificial Intelligence, Web Development, and more and has a midsize team.Read More
Clients
Siveco Romania Olive Garden Darden KhataBookIndustries
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4$10,000+50 - 249 employeesSan Francisco, CAAirdev is a software development company established in 2015. The company provides Custom Software Development, Artificial Intelligence, Low/No Code Development, and Web Development and has a midsize team. The company is based in San Francisco, California.Read More
Clients
HPIndustries
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5$5,000+50 - 249 employeesSan Francisco, CAUPQODE is a web design agency. The midsize Nashville, Tennessee-based team focuses on Web Design, UX/UI Design, and Web Development. The agency was founded in 2015.Read More
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Gracenote - Entertainment ProvidersIndustries
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6$10,000+50 - 249 employeesSan Francisco, CAIn Alexandria, Virginia and San Francisco, California, JetRuby Agency is a midsize artificial intelligence company. They offer Artificial Intelligence, Custom Software Development, Mobile App Development, Web Development, and more and were launched in 2010.Read More
Clients
OSRAMIndustries
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7$50,000+50 - 249 employeesSan Francisco, CAClear Digital Inc is a web design agency. The midsize San Jose, California-based team offers Web Design, Web Development, Digital Strategy, Branding, and more. The company was launched in 1999.Read More
Clients
Aviatrix Splunk Sift CiscoIndustries
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8$25,000+50 - 249 employeesSan Francisco, CASudolabs is an AI firm in Košice, Slovakia; San Francisco, California; San Francisco, California and West Hollywood, California. They offer Artificial Intelligence, AI Consulting, UX/UI Design, IT strategy consulting, and more and were founded in 2017.Read More
Clients
The Expert (https://www.theexpert.com/)Industries
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9$50,000+10 - 49 employeesSan Francisco, CATogether is a branding company launched in 2018. The small team specializes in Branding, UX/UI Design, Product Design, Web Development, and more. The agency is located in London, England; New York, New York and San Francisco, California.Read More
Clients
UnitIndustries
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10$25,000+10 - 49 employeesSan Francisco, CARead More
Cylogy Inc. Is a website development firm. They are located in San Francisco, California and have a small team that provides web development, application management & support, digital strategy, IT strategy consulting, and more. The company was founded in 2001.
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11$10,000+50 - 249 employeesBerkeley, CARead More
Founded in 2016, Crowdbotics is a development company based in Berkeley, Calif. They work with businesses of all sizes in the business services, consumer products, and healthcare fields.
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StripeIndustries
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12$100,000+1,000 - 9,999 employeesSan Francisco, CARead More
Headquartered in San Francisco, Wizeline is a global technology services provider with delivery centers in Mexico, Colombia, Spain, and Vietnam. Since its founding in 2014, Wizeline has grown to over 1,300 employees specializing in product/platform development, UX design, data & AI, cloud & DevOps, and product evolution services.
Clients
Fitz Frames -
13$50,000+50 - 249 employeesSan Francisco, CARead More
Cybercraft Inc. is a development agency headquartered in Lviv, Ukraine, that was established 2012. Their team of 19 offers custom software development, IT staff augmentation, web development, and more.
Clients
Palo Alto NetworksIndustries
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14$10,000+50 - 249 employeesSan Mateo, CACidersoft - Web Design & Staff Augmentation is a web development firm established in 2015. The firm focuses on Web Development, IT staff augmentation, E-Commerce Development, and Web Design and has a midsize team.Read More
Clients
HPIndustries
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15$25,000+250 - 999 employeesSan Francisco, CARobosoft Technologies Inc. Is a San Francisco, California-based app development company. They offer Mobile App Development, UX/UI Design, Web Development, Custom Software Development, and more and were launched in 1996.Read More
Clients
Warner Bros. Discovery HSBC McDonalds Mercury FinanceIndustries
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16$10,000+50 - 249 employeesSan Francisco, CARead More
Founded in 2012, SF AppWorks is a digital agency that produces innovative technologies for mainly midmarket companies. Based in San Francisco, their team of 50+ specializes in web development, mobile app development, UX/UI design, and custom software development.
Clients
West ElmIndustries
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17$10,000+50 - 249 employeesSan Francisco, CADouble Coconut is an application development firm. The midsize San Francisco, California-based company was established in 2012. Their services include Mobile App Development, Web Development, Custom Software Development, UX/UI Design, and more.Read More
Clients
EA Sports | Madden NFL Microsoft Casual Games Ellen Degeneres OTG GamesIndustries
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18$10,000+10 - 49 employeesOakland, CARead More
Founded in 2021, Nimi Tech Limited is a small software development firm based in Oakland, California; Colombo, Sri Lanka and Chennai, India. Their services include custom software development, web development, mobile app development, IT staff augmentation, and more.
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19$25,000+50 - 249 employeesSan Francisco, CARead More
Grio is a software consulting firm based in San Francisco, Calif, that was established in 2008. Their team of 50 employees offers web development, mobile app development, and UX/UI design services.
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20$25,000+10 - 49 employeesSan Francisco, CASavas Labs is a small web development company founded in 2013. Their services include Web Development, Web Design, UX/UI Design, Custom Software Development, and more. The agency is located in New York, New York; San Francisco, California; Boston, Massachusetts and Washington, District of Columbia.Read More
Clients
Harvard University Environmental Defense Fund Adobe NPRIndustries
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21$50,000+50 - 249 employeesSan Francisco, CAFounded in 2017, Sprint Studios is an IT staff augmentation company. Their midsize team is headquartered in San Francisco, California; San Juan, Puerto Rico; Miami, Florida and New York, New York. Their services include IT staff augmentation, Custom Software Development, Web Development, Mobile App Development, and more.Read More
Clients
SnapptIndustries
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22$10,000+10 - 49 employeesSan Francisco, CAIT strategy consulting company Techlexity was founded in 2019. Located in L'viv, Ukraine and San Francisco, California, their small team provides IT strategy consulting, Custom Software Development, Web Development, Mobile App Development, and more.Read More
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23$1,000+10 - 49 employeesSan Francisco, CARead More
Based in San Francisco, Weby Agency is a design, marketing & growth consulting company that was founded in 2017. Their small team of two assists with web design & development, content marketing, and e-commerce development for primarily small businesses.
Clients
https://puraleafs.com/Industries
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24$5,000+10 - 49 employeesSan Francisco, CARead More
Launched in 2020, Apex Lab is a software development company. Their small team is based in Tallinn, Estonia and San Francisco, California. Their team offers custom software development, mobile app development, web development, and enterprise app modernization.
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25$5,000+10 - 49 employeesSan Francisco, CABurst Digital is a web design company. Established in 2018, the company is located in London, England; New York, New York and San Francisco, California. The small team offers Web Design, Web Development, Search Engine Optimization, Branding, and more.Read More
Clients
Vivienne Westwood - The Vivienne Foundation Artisan AI Cogency Global Moonbeam Car WashIndustries
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26$50,000+10 - 49 employeesSan Francisco, CARead More
Dayspring Technologies is a custom software and web development firm founded in 1997. They have just under 30 employees based in their San Francisco office. Much of their work focuses on custom software development for in-house platforms, but they also build client-side web apps, user interfaces, and e-commerce platforms.
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American Red CrossIndustries
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27$25,000+10 - 49 employeesOakland, CARead More
Kalamuna is a web development and design agency founded in 2012. They have 15 employees based in their Oakland, Calif. office. The bulk of their services focus on full-service web development, from visual design to server-side operations. Kalamuna also offers custom software development and digital strategy consulting.
Clients
American Foundation for the BlindIndustries
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28$25,000+50 - 249 employeesOrinda, CARead More
Based out of Orinda, CA with satellite offices in India and Croatia, Daxima is a software development company. The team of more than 50 employees has been in business since 2003. They provide web, software, and mobile app development for clients around the world.
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T-Mobile USIndustries
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29$25,000+50 - 249 employeesSan Francisco, CALocated in San Francisco, California; San Ramon, California and Lahore, Pakistan, Kwanso LLC is a custom software development firm. They focus on Custom Software Development, Web Development, Mobile App Development, IoT development, and more and were founded in 2012.Read More
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US NewsIndustries
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30$10,000+10 - 49 employeesSan Francisco, CARead More
PLATFORM, based out of San Francisco, CA, is a UX/UI agency that also engages in web and mobile app development. The majority of their clients are small businesses, though they work with enterprise and midmarket businesses as well. PLATFORM has done projects in advertising, financial services, information technology, and real estate, among others.
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SpotifyIndustries
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