Top 100 JavaScript Development Companies in San Francisco
The Best of December 2025Looking 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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31$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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32$10,000+10 - 49 employeesSan Francisco, CARead More
Founded in 2018, Aphelia Innovations is a mobile application development company. Their small team is based in New Delhi, India. Their services include mobile app development, IT staff augmentation, and web development.
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Skylark Group, IndiaIndustries
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33$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.
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https://puraleafs.com/Industries
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34$10,000+50 - 249 employeesSan Mateo, CAG360Technologies is a custom software development firm. Established in 2010, the team provides Custom Software Development, Generative AI, Application Testing, Application Management & Support, and more. Their midsize company is located in San Mateo, California and Montevideo, Uruguay.Read More
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35$100,000+10 - 49 employeesSan Francisco, CARead More
This California-based software company has strong expertise in web and mobile app development. The team of less than 50 has worked in various industries, from fitness to healthcare – they’ve done it all.
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GoogleIndustries
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36$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.
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American Foundation for the BlindIndustries
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37$10,000+10 - 49 employeesSan Francisco, CARead More
Galliot is a San Francisco-based software development firm founded in 2018. With an additional office in Montevideo, Uruguay, their 10-man-team develops products for midmarket and enterprise-level clients. While custom software and DevOps are their specialties, they also offer web development and cloud consulting.
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Life scienceIndustries
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38$10,000+2 - 9 employeesOakland, CARead More
State Creative is a web design and development company located in Oakland, CA. Founded in 2000, State Creative's team of nearly 10 employees also offer e-commerce development. They serve small and mid-market businesses in the business services, finance, and consumer products industries.
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MarsVenusIndustries
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39$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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40$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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41$10,000+10 - 49 employeesSan Francisco, CABased in San Francisco, California, Dworkz is an UX design agency. The small firm was founded in 2004. Their team provides UX/UI Design, Custom Software Development, Web Design, Web Development, and more.Read More
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CellanomeIndustries
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42$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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43$10,000+10 - 49 employeesSan Francisco, CANova Era Agency, a web design agency, is located in San Francisco, California. The small team offers Web Design, Web Development, UX/UI Design, Artificial Intelligence, and more. The company was founded in 2025.Read More
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44$10,000+2 - 9 employeesSan Francisco, CARead More
Digi Hotshot, a web development company, was launched in 2019. They are in Dehradun, India and have a small team. Digi Hotshot offers web development, web design, and ux/ui design.
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45$50,000+10 - 49 employeesSan Francisco, CAGearheart.io is a software development firm launched in 2012. Their small team is based in Kyiv, Ukraine; San Francisco, California and Newark, Delaware and provides Custom Software Development and Web Development.Read More
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SmartSuiteIndustries
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46$5,000+50 - 249 employeesSan Francisco, CARead More
Siddhi Infosoft is a web and mobile app development company based in San Francisco, with a secondary location in Ahmedabad, India. Siddhi Infosoft was founded in 2011 and has 25 employees. Services offered by this company include mobile app development and web development for companing ranging from startups to Fortune 500 brands.
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DizzyDoctorIndustries
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47$5,000+10 - 49 employeesSan Francisco, CARead More
Thomas Digital Web Design is a web design agency based in San Francisco. The agency, founded in 2010, is a team of less than ten that provides web design, web development, and SEO services to small and midmarket companies.
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California Olive RanchIndustries
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48$25,000+10 - 49 employeesSan Francisco, CARead More
Yeti LLC is a software development and design company founded in 2010. They have 20 employees, all of whom work out of an office in San Francisco. Yeti's practice is extensive for a firm of its size; they offer custom software development, UI/UX design, mobile apps, and IoT development.
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GoogleIndustries
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49$5,000+10 - 49 employeesSan Francisco, CAIMRepublic, Inc, a custom software development company, was established in 2005. The small San Francisco, California-based team provides custom software development, mobile app development, web development, ux/ui design, and more.Read More
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Riverside InsightsIndustries
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50Undisclosed50 - 249 employeesSan Francisco, CARead More
Scalio is a global digital product agency based in San Francisco, with offices in Atlanta and in Orange, Calif. The agency, founded in 2011, has more than 40 employees and provides, among others, web design, UX/UI design, and web development services to midmarket and other companies in various industries.
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Intuitive SurgicalIndustries
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51$10,000+10 - 49 employeesSan Francisco, CACoding Crafts LLC is a mobile application development firm in San Francisco, California. The small team specializes in Mobile App Development, Web Development, Custom Software Development, Blockchain, and more and was established in 2019.Read More
Clients
YogaJointIndustries
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52$1,000+50 - 249 employeesSan Francisco, CALaunched in 2020, iBOS is an UX design agency. Their midsize team is headquartered in San Francisco, California. Their services include UX/UI Design, Mobile App Development, Web Development, and Low/No Code Development.Read More
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53$25,000+10 - 49 employeesBerkeley, CARead More
SpaceBus is a Magento development agency with two locations—one in Berkeley, Calif., and one in Dnipro, Ukraine. Since 2019, their team of 10+ employees provides Magento-based e-commerce development and web development to mid-market and enterprise-level clients.
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YamahaIndustries
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54$25,000+50 - 249 employeesWarszawa, PolandRead More
NG Logic is a software company headquartered in Warsaw, Poland that specializes in mobile app and web development. Founded in 2003, the company has an additional office in Austin, Texas and has over 50 employees.
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Digital Cheetach Perception Software ContractroomIndustries
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55$25,000+50 - 249 employeesSan Francisco, CALaunched in 1999, Clear Digital Inc is a web design company. The company focuses on Web Design and Web Development, and is midsize.Read More
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Aviatrix Splunk Cohesity HabuIndustries
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56$1,000+50 - 249 employeesSan Francisco, CAHygge Software is a midsize UX agency. Headquartered in Warszawa, Poland; Tallinn, Estonia; San Francisco, California and London, England, the firm was established in 2019. Their services include UX/UI Design, Custom Software Development, Web Development, Mobile App Development, and more.Read More
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HeatedIndustries
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57$5,000+50 - 249 employeesSan Francisco, CARead More
Based in San Francisco, California, AllCode is a cloud consulting & SI company. The agency specializes in cloud consulting & SI, Custom Software Development, Web Development, UX/UI Design, and more and is midsize.The agency was founded in 2015.
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TwilioIndustries
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58$5,000+10 - 49 employeesSan Mateo, CARead More
Located in San Mateo, California and Beograd, Serbia, Action Engine is a software development firm. They offer custom software development, web development, ux/ui design, mobile app development, and more and were launched in 2017.
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59$10,000+10 - 49 employeesSan Francisco, CALocated in San Francisco, California, Molly Duggan Associates is a branding company. They specialize in Branding, Marketing Strategy, Web Development, and Artificial Intelligence and were established in 2000.Read More
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60$25,000+50 - 249 employeesSan Francisco, CARead More
UX design agency webkeyz is headquartered in San Francisco, California and Cairo, Egypt. The small agency was established in 2009. Their services include ux/ui design, product design, and branding.
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MicrosoftIndustries
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