Top 100 Application Modernization Companies in California
The Best of December 2025Looking 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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1$50,000+250 - 999 employeesPalo Alto, CARead More
Turing is a small IT staff augmentation company. Established in 2018, the agency is in Palo Alto, California. Their services include IT staff augmentation.
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2$100,000+250 - 999 employeesLos Angeles, CAIn Los Angeles, California; Santa Monica, California; New York, New York and San Francisco, California, TheoremOne is a midsize software development company. They focus on Custom Software Development, IT strategy consulting, Business Consulting, IoT development, and more and were founded in 2007.Read More
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AT&TIndustries
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3$25,000+10 - 49 employeesIrvine, CABaytech Consulting is a custom software development company based in Irvine, California. They focus on Custom Software Development, Web Development, Mobile App Development, Artificial Intelligence, and more and were launched in 2007.Read More
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Petra Medical CollegeIndustries
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4$5,000+50 - 249 employeesPasadena, CAEstablished in 1991, Art+Logic is a software development firm. The agency specializes in Custom Software Development, UX/UI Design, Web Development, Mobile App Development, and more and has a midsize team.Read More
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Yamaha Kroger Trader Joes NASAIndustries
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5$25,000+50 - 249 employeesLos Angeles, CAUser experience design agency ISBX Corp was launched in 2009. They are located in Los Angeles, California and have a midsize team. ISBX Corp focuses on UX/UI Design, Custom Software Development, Web Development, Mobile App Development, and more.Read More
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Science37 BrainCorp Red Bull - Multiple Projects Apple/BeatsIndustries
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6$10,000+50 - 249 employeesLos Angeles, CARead More
DevTeam.Space is a development agency that was founded in 2015 and is based in Los Angeles. Their team of 8 specialize in web development and mobile app development for small businesses; these clients primarily reside in the advertising, business services, and consumer product industries.
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AirbusIndustries
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7Undisclosed50 - 249 employeesSan Francisco, CARead More
Martian Craft is a user experience design company established in 2010. The company provides ux/ui design, cloud consulting & SI, custom software development, web development, and more and has a midsize team.
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AppleIndustries
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8$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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9$50,000+10 - 49 employeesIrvine, CARead More
Company A is a custom application development company based in Irvine, Calif., with offices in Plano, Texas, and Novi Sad, Serbia. The company, founded in 2015, has a team of more than ten that provides cloud consulting & SI, custom software development, web development, mobile app development, and enterprise app modernization services. Company A serves small and larger-sized companies in various industries, including IT, financial services, and health care & medical.
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10$5,000+2 - 9 employeesMission Viejo, CARead More
Calibec is a small custom software development firm. Founded in 2021, the team offers custom software development, web development, mobile app development, enterprise app modernization, and more. The agency is located in Mission Viejo, California.
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11$5,000+10 - 49 employeesSausalito, CARead More
Atricore is an agile Sausalito, California-based IAM product, services, and consulting company launched in 2007. Their team of IAM experts focuses on identity and access management orchestration and modernization, cybersecurity, and IT strategy consulting; with SaaS tools for cloud identity migration.
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12$25,000+10 - 49 employeesTruckee, CANew Leaders is a small custom software development company. They focus on Custom Software Development, UX/UI Design, E-Commerce Development, Mobile App Development, and more and were founded in 2007. The agency is in Truckee, California and Beijing City, China.Read More
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Appfolio.comIndustries
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13$10,000+10 - 49 employeesSanta Monica, CARead More
Founded in 2005, Invemo is a tech company headquartered in Santa Monica with another location in IST, Turkey. Their team of 4 provide mobile app development, UX/UI design, IT strategy, and app modernization services to clients.
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Invemo created innovative solutions for Philips -
14$10,000+10 - 49 employeesSacramento, CARead More
Prestige Development Group is an IT staff augmentation company based in Sacramento, California. The small firm was launched in 2016. Their team specializes in IT staff augmentation, custom software development, mobile app development, and blockchain.
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Capital OneIndustries
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15$1,000+2 - 9 employeesLos Angeles, CARead More
Themis Web Technologies is a software development company based in Los Angeles, California. Founded in 2007, they are a sole proprietorship that provides web development, e-commerce development, custom software development, and enterprise app modernization.
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Incited MediaIndustries
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16$25,000+10 - 49 employeesSan Jose, CARead More
Based in San Jose, California, E8 Labs is a mobile app development company. The company provides mobile app development, custom software development, web development, e-commerce development, and more and is small.The company was founded in 2017.
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Enlightened MeditationIndustries
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17$25,000+2 - 9 employeesFairfield, CARead More
Ideas Factory US is a custom software development company established in 2014. Based in Fairfield, California, their small team focuses on custom software development, enterprise app modernization, IT strategy consulting, cloud consulting & SI, and more.
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18$10,000+2 - 9 employeesLos Angeles, CARead More
InfiniOne is a software development agency that has been offering mobile app development, custom software development, and web development services to their clients in the financial services, business services, and e-commerce industries since 2012. Their team of 10 employees are based out of their offices in Los Angeles, Beverly Hills, Calif., and Liberty, Pakistan.
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SkinnygirlIndustries
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19$50,000+10 - 49 employeesLake Forest, CALaminar Consulting Services Inc. Is a small software development company. The Lake Forest, California-based company was founded in 2005. Their services include Custom Software Development, Application Testing, Enterprise App Modernization, cloud consulting & SI, and more.Read More
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ExemplisIndustries
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20$5,000+10 - 49 employeesLos Angeles, CAPircle is a software development firm. They are in Los Angeles, California and have a small team that focuses on Custom Software Development, Web Development, Mobile App Development, and Enterprise App Modernization. The firm was founded in 2012.Read More
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21$1,000+10 - 49 employeesSan Diego, CARead More
SiteCraft Inc. Is a small software development company. They specialize in custom software development, web development, ux/ui design, e-commerce development, and more and were launched in 2016. The company is headquartered in , Ukraine.
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22$10,000+2 - 9 employeesBurbank, CARead More
Worklab.io, Inc. is a software agency founded in 2011 with no more than 10 members. They offer custom software, web, and mobile app development solutions from their office in Burbank, Calif. They work with small and mid-market firms in the field of business services.
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All State AssociationIndustries
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23$1,000+2 - 9 employeesCorona, CALocated in Corona, California, WellomyTech is an IT managed services company. They offer IT managed services, Artificial Intelligence, custom software development, enterprise app modernization, and more and were established in 2021.Read More
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24$10,000+50 - 249 employeesFremont, CARead More
Agile Soft Systems, Inc, a custom software development firm, was launched in 2012. Their midsize team is headquartered in Fremont, California. Their services include custom software development, application testing, blockchain, enterprise app modernization, and more.
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25$100,000+2 - 9 employeesSacramento, CAPragmint is a big data company. Located in Sacramento, California, their small team offers BI & big data consulting & SI, Custom Software Development, Enterprise App Modernization, IT strategy consulting, and more. The firm was founded in 2021.Read More
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26$10,000+10 - 49 employeesSan Francisco, CARead More
Streamline social, a software development firm, is headquartered in San Francisco, California; Buffalo, New York and Montevideo, Uruguay. Founded in 2009, the small team specializes in custom software development, mobile app development, ux/ui design, product design, and more.
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27Undisclosed2 - 9 employeesEncinitas, CARead More
Agency73 is a development shop based in Encinitas, Calif. Founded in 2017, Agency73's team of about 10 employees specializes in providing custom software development, web development, and e-commerce development services for mid-market and enterprise businesses in the healthcare, advertising and IT industries.
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IntuitIndustries
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28Undisclosed10 - 49 employeesIrvine, CAEstablished in 2017, Chiron IT is an Enterprise App Modernization company. Their team focuses on Enterprise App Modernization and IT managed services.Read More
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29$10,000+10 - 49 employeesSan Mateo, CAEstablished in 2009, On Demand One, Inc. Is a small Enterprise App Modernization company. Their team focuses on Enterprise App Modernization.Read More
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30$50,000+10 - 49 employeesSan Marcos, CATrailhead Technology Partners, a custom software development firm, was founded in 2016. The small team offers Custom Software Development and Enterprise App Modernization.Read More
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