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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31$10,000+10 - 49 employeesSan Francisco, CAAphelia Innovations is an artificial intelligence firm. Launched in 2018, the small agency is in New Delhi, India; Bengaluru, India and San Francisco, California. Their services include Artificial Intelligence, Web Development, IT staff augmentation, Mobile App Development, and more.Read More
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Skylark Group, IndiaIndustries
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32$10,000+10 - 49 employeesSan Francisco, CACoding Crafts is an artificial intelligence development company. The small San Francisco, California-based agency was established in 2019. Their services include Artificial Intelligence, Custom Software Development, and Web Development.Read More
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YogaJointIndustries
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33$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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34$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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35Undisclosed50 - 249 employeesSan Francisco, CAYellow is a midsize artificial intelligence development company located in San Francisco, California; Paris, France; T'bilisi, Georgia and Cape Town, South Africa. They provide Artificial Intelligence and Web Development and were launched in 2015.Read More
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Fusion MarketsIndustries
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36$50,000+10 - 49 employeesSan Francisco, CAHeadquartered in Kyiv, Ukraine; San Francisco, California; Newark, Delaware and Tallinn, Estonia, Gearheart.io is a software development company. The small team offers Custom Software Development, AI Agents, Enterprise App Modernization, DevOps Managed Services, and more and was launched in 2012.Read More
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SmartSuite ICEIndustries
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37$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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38$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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39$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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40Undisclosed50 - 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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41$10,000+50 - 249 employeesSan Francisco, CARead More
Kodexo Labs, an AI development company, is in Austin, Texas; London, England; Karachi, Pakistan and San Francisco, California. Founded in 2021, the midsize team specializes in Artificial Intelligence, Custom Software Development, Mobile App Development, AI Agents, and more.
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Diesel Laptops (Inc. 5000 — Fleet Diagnostics) Extensiv ($130M+ Funded, Inc. 5000 — 3PL Warehouse Management) IFPG (#1 Franchise Broker Organization, North America) Teacher AI ($5M+ First-Year Revenue — AI Language Platform)Industries
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42$10,000+50 - 249 employeesSan Francisco, CARead More
The Rocked Code is a custom software development firm. Their midsize team is located in Ciudad de México, Mexico. Their services include custom software development, other IT consulting and SI, application management & support, product design, and more. The agency was established in 2016.
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Coru Creze Hexalud SEOS EnergyIndustries
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43$5,000+10 - 49 employeesSan Mateo, CAHapy Co is a San Mateo, California-based Enterprise App Modernization company. The small team specializes in Enterprise App Modernization, Mobile App Development, Product Design, and Web Development. The company was launched in 2017.Read More
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44$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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45$1,000+10 - 49 employeesSan Mateo, CABinstellar Technologies Pvt. Ltd., a mobile application development company, was established in 2021. The firm specializes in Mobile App Development, Custom Software Development, ERP consulting and SI, Web Development, and more and has a small team. The firm is based in Ahmedabad, India and San Mateo, California.Read More
Clients
Test RoutesIndustries
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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$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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48$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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49$25,000+50 - 249 employeesSan Mateo, CARead 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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50$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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51$1,000+50 - 249 employeesSan Francisco, CABased in Mission, Kansas; Atlanta, Georgia; Dallas, Texas and Nashville, Tennessee, SoftDoes is a software development company. The firm offers Custom Software Development, UX/UI Design, Artificial Intelligence, IT managed services, and more and is midsize.The firm was launched in 2019.Read More
Clients
FMY Orthodontics Ulala WIX ReclaimIndustries
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52$1,000+50 - 249 employeesSan Francisco, CAFounded in 2019, Hygge Software is an AI company. Their midsize team is in Warszawa, Poland; Tallinn, Estonia; San Francisco, California and London, England. Their team focuses on Artificial Intelligence, Custom Software Development, Web Development, Mobile App Development, and more.Read More
Clients
HeatedIndustries
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53$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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54$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.
Clients
MicrosoftIndustries
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55$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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56$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.
Clients
TwilioIndustries
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57$5,000+1,000 - 9,999 employeesSan Francisco, CARead More
Established in 2011, AppTecHub is a large mobile application development company. Their team offers mobile app development, web development, and custom software development. The agency is located in San Francisco, California.
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58$25,000+2 - 9 employeesOakland, CAAclarify is a software development company. They are headquartered in Boston, Massachusetts and Oakland, California and have a small team. Their services include Custom Software Development, Artificial Intelligence, AI Agents, Enterprise App Modernization, and more. The company was launched in 2022.Read More
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59$10,000+10 - 49 employeesOakland, CAMarketing Strategy company Reverence Global was established in 2020. The firm focuses on Marketing Strategy, Branding, Search Engine Optimization, Web Design, and more and has a small team.Read More
Clients
Good Radiance Inc.Industries
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60$1,000+10 - 49 employeesSan Francisco, CARead More
Proleadsoft is a full-service digital agency headquartered in San Francisco, Calif. With a team of around 15 employees, Proleadsoft specializes in web development, SEO, and web design.With Proleadsoft's help, the youth nonprofit's website is modern, easy to navigate, and has attracted more traffic.
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Travel Merchants
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