Top 100 Application Modernization Companies in California
The Best of October 2026Looking for a top legacy modernization service in California?
Application modernization companies can help create new business value from existing applications. Finding the right company to partner with, however, can be an overwhelming process.
To assist you in your search for a partner, we’ve compiled this list of the top application modernization services in California. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best California Enterprise Application Modernization Services
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121$5,000+2 - 9 employeesSacramento, CACoreBackend is a software development company established in 2025. Headquartered in Sacramento, California, the team focuses on Custom Software Development and API Development.Read More
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122$50,000+50 - 249 employeesSan Francisco, CACheesecake Labs – AI, Data, & Product is an AI Consulting company located in San Francisco, California and Florianopolis, Brazil. The midsize agency was launched in 2013. Their team offers AI Consulting, Custom Software Development, Artificial Intelligence, and Enterprise App Modernization.Read More
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MoneyGram International Stellar Development Foundation AB Inbev Mutual of OmahaIndustries
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123Undisclosed10 - 49 employeesLong Beach, CACloud Advisory LLC is an application development company founded in 2011. The small team offers Mobile App Development and Web Development.Read More
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124UndisclosedFreelancer employeesSan Diego, CAPaul Lewallen Studios is a web development firm. The company is based in San Diego, California. Their services include Web Development and Mobile App Development.Read More
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125Undisclosed250 - 999 employeesLos Angeles, CARead More
ES99 is a branding company launched in 1999. They are in Chicago, Illinois and have a midsize team. Their services include branding, advertising, direct marketing, market research, and more.
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126$50,000+250 - 999 employeesMilpitas, CARead More
West Agile Labs is a software development and digital design company. The team is headquartered in San Francisco and has additional offices in Pakistan, Ukraine, and India. Founded in 2012, they currently employ over 120 professionals. West Agile Labs provides custom software development, e-commerce development, and mobile app development services.
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UnationIndustries
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127$25,000+50 - 249 employeesRedwood City, CASoftware development firm Intelygenz is headquartered in Madrid, Spain and Redwood City, California. The team offers Custom Software Development and Artificial Intelligence.Read More
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128$5,000+10 - 49 employeesSan Jose, CAA-CX is a software development company. Based in San Jose, California and Vancouver, Canada, their team focuses on Custom Software Development and Artificial Intelligence.Read More
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129$10,000+2 - 9 employeesRowland Heights, CAClockCode, a software development company, is based in Rowland Heights, California. Their services include Custom Software Development and Web Development.Read More
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130$25,000+50 - 249 employeesCosta Mesa, CARead More
Squash Apps is a software development company founded in 2015 and headquartered in Coimbatore, India. It has a team of about 20. Squash Apps works on mobile app development, custom software development, web development, and more for small businesses.
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DoodlioIndustries
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131$5,000+250 - 999 employeesMilpitas, CAChirpn IT Solutions, an IT staff augmentation company, was launched in 2016. Their midsize team is based in Milpitas, California; Girraween, Australia and Pune, India. The company provides IT staff augmentation, custom software development, web design, enterprise app modernization, and more.Read More
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132$1,000+Freelancer employeesAnaheim, CAFounded in 2014, socialomical is a small Anaheim, California-based branding agency. Their team specializes in Branding and Product Design.Read More
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133$10,000+250 - 999 employeesSanta Clara, CAWinWire Technologies is an user experience company. Their midsize team is based in Santa Clara, California and Hyderabad, India. Their services include UX/UI Design and cloud consulting & SI.Read More
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134Undisclosed10 - 49 employeesSan Ramon, CACidersoft is a web design company. The San Ramon, California-based team provides Web Design and UX/UI Design.Read More
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135Undisclosed2 - 9 employeesCupertino, CAStep Ahead Solutions, Inc. Is a Cybersecurity company. Launched in 2006, the company is headquartered in Cupertino, California. Their services include Cybersecurity and BI & big data consulting & SI.Read More
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136$25,000+50 - 249 employeesRancho Palos Verdes, CALaunched in 2005, Ardas is a custom software development firm. Located in Rancho Palos Verdes, California and Dnipro, Ukraine, their midsize team provides Custom Software Development, Artificial Intelligence, Enterprise App Modernization, AI Consulting, and more.Read More
Clients
Stripo Flinquer Courier Exchange InfinoxIndustries
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137Undisclosed50 - 249 employeesSan Jose, CAMobile application development company EnLume Inc is in San Jose, California and Hyderabad, India. They focus on Mobile App Development and Enterprise App Modernization.Read More
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138$25,000+250 - 999 employeesSan Francisco, CAPythian is a business intelligence company in Ottawa, Canada and San Francisco, California. They specialize in BI & big data consulting & SI and cloud consulting & SI and were launched in 1997.Read More
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Fox SportsIndustries
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139Undisclosed50 - 249 employeesSan Francisco, CAThoughtMinds is a Generative AI company. The team offers Generative AI and Artificial Intelligence, and the company is in San Francisco, California and Navi Mumbai, India.Read More
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140Undisclosed50 - 249 employeesSanta Clara, CASATech Digital is a software development company. The Santa Clara, California-based team focuses on Custom Software Development and Enterprise App Modernization.Read More
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141$100,000+10 - 49 employeesFolsom, CAFounded in 2018, Flexday Solutions LLC is a small Naperville, Illinois-based IT strategy consulting company. Their services include IT strategy consulting and cloud consulting & SI.Read More
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142Undisclosed10 - 49 employeesSan Francisco, CASoftware Next Door is a software development firm. The team focuses on Custom Software Development and Mobile App Development and is headquartered in San Francisco, California.Read More
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143$10,000+10 - 49 employeesSan Jose, CAArastu Systems is an IoT development company. The agency is in San Jose, California and Ahmedabad, India. Their team provides IoT development and Enterprise App Modernization.Read More
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144$25,000+1,000 - 9,999 employeesLos Angeles, CAArtificial intelligence firm Simform was launched in 2010. They are headquartered in Orlando, Florida; Los Angeles, California; Chicago, Illinois and San Francisco, California and have a large team. Simform focuses on Artificial Intelligence, cloud consulting & SI, CRM consulting and SI, ERP consulting and SI, and more.Read More
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RedbullIndustries
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145$5,000+50 - 249 employeesSanta Rosa, CARead More
GeneXus Consulting is corporate software development company based in Montevideo, Uruguay, with an additional location in Santa Rosa, Calif. Founded in 1988, the team of nearly 110 provides web, mobile app, and custom software development, enterprise app modernization, and application testing services.
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BPSIndustries
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146$25,000+250 - 999 employeesNewark, CAArgusoft is a software development firm. They offer Custom Software Development, Mobile App Development, Web Development, Enterprise App Modernization, and more and were established in 2001. Their midsize team is based in Newark, California and Gandhinagar, India.Read More
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World Health Organization (WHO)Industries
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147$50,000+50 - 249 employeesPalo Alto, CARobiquity is an IT strategy consulting company. Based in Manchester, England and Toronto, Canada, the team provides IT strategy consulting and cloud consulting & SI.Read More
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148$25,000+50 - 249 employeesAgoura Hills, CATechAhead is a midsize application development company based in Agoura Hills, California; Noida, India and Dubai, United Arab Emirates. They focus on Mobile App Development, Enterprise App Modernization, Artificial Intelligence, and Custom Software Development and were launched in 2009.Read More
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AXA University of Toronto Audi American ExpressIndustries
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149Undisclosed2 - 9 employeesPalo Alto, CASmart IT Concepts is a custom software development company. The Palo Alto, California-based firm was established in 2009. Their services include Custom Software Development and Web Development.Read More
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150Undisclosed2 - 9 employeesLos Angeles, CAAztecaNet Inc. Is a software development firm headquartered in Los Angeles, California. They focus on Custom Software Development and Web Development.Read More
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