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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61$50,000+10 - 49 employeesRolling Hills Estates, CAVCloud Tech is a Rolling Hills Estates, California-based enterprise app modernization company. The small company was launched in 2013. Their team provides enterprise app modernization, cloud consulting & SI, IT managed services, cybersecurity, and more.Read More
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62$25,000+2 - 9 employeesCalabasas, CALaunched in 2015, i6 technology is a software development firm. The company focuses on Custom Software Development and Web Development.Read More
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63$5,000+50 - 249 employeesWestlake Village, CAScreamingBox is an Other Application Development company. The company is based in Westlake Village, California. Their services include Other Application Development and Custom Software Development.Read More
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64$75,000+10 - 49 employeesSan Diego, CAVault R&D is a small IT strategy consulting company. In San Diego, California, the company was founded in 2022. Their team provides IT strategy consulting, custom software development, enterprise app modernization, ux/ui design, and more.Read More
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65$25,000+10 - 49 employeesSan Diego, CABorder UX is an UX agency. Founded in 2018, the team specializes in UX/UI Design and Custom Software Development. The firm is located in San Diego, California.Read More
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66$50,000+10 - 49 employeesCosta Mesa, CATepia is a Costa Mesa, California-based mobile application development firm. The small agency was founded in 2012. Their services include Mobile App Development, IoT development, Custom Software Development, Web Development, and more.Read More
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67$25,000+2 - 9 employeesSan Jose, CAInizio Inc, a small mobile app development company, is based in San Jose, California. Their services include Mobile App Development and Web Development.Read More
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68$1,000+2 - 9 employeesFolsom, CALaunched in 2017, IGNITE LOGIX is a small software development firm. Their services include Custom Software Development and Web Development.Read More
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69$10,000+10 - 49 employeesLafayette, CAFounded in 2011, Synap is a small Reno, Nevada-based software development firm. Their services include Custom Software Development and Enterprise App Modernization.Read More
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70$10,000+10 - 49 employeesSan Carlos, CAHeadquartered in San Carlos, California, TRG Digital is a custom software development firm. They provide Custom Software Development and Digital Strategy and were established in 2018.Read More
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71$25,000+2 - 9 employeesIrvine, CACybersecurity company GoatBytes.IO is located in Irvine, California. Their services include Cybersecurity and Mobile App Development.Read More
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72Undisclosed10 - 49 employeesFair Oaks, CALaunched in 2006, BG Software is a Cybersecurity company. The agency provides Cybersecurity and Custom Software Development.Read More
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73$5,000+10 - 49 employeesFremont, CATOPSYNTAX INC, a software development firm, is in Fremont, California. They specialize in Custom Software Development and Enterprise App Modernization and were founded in 2018.Read More
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74$1,000+10 - 49 employeesFoster City, CALihan Technologies, a web development company, was established in 2017. The small team offers Web Development and Mobile App Development.Read More
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75$25,000+50 - 249 employeesSan Jose, CARead More
MW2 Consulting is a certified Magento partner that specializes in e-commerce development, SEO, web design, and mobile app development. Founded in 1999, the company helps B2B and direct-to-consumer brands create strategic solutions. Their team consists of 33 employees and operates out of San Jose, Calif.
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Stella & DotIndustries
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76$25,000+50 - 249 employeesWarszawa, PolandRead More
Aligned Code, a enterprise app modernization company, is located in Warszawa, Poland and Palo Alto, California. The midsize company was founded in 2013. Their services include enterprise app modernization, mobile app development, custom software development, web development, and more.
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PepsiCoIndustries
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77Undisclosed2 - 9 employeesSan Diego, CAHurrikan Logic is a small SEO company launched in 2013. Their services include Search Engine Optimization and UX/UI Design.Read More
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78$10,000+10 - 49 employeesPalo Alto, CASeroft.com, a small software development firm, is headquartered in Palo Alto, California and London, England. The team provides Custom Software Development and Mobile App Development.Read More
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79$25,000+50 - 249 employeesSan Francisco, CABRICKLAND is a web development company launched in 1995. The firm provides Web Development and Enterprise App Modernization, and is midsize.Read More
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80$1,000+10 - 49 employeesPasadena, CATechnology Spree is a Business Consulting company. The team focuses on Business Consulting and Custom Software Development, and the agency is located in Kolkata, India and Pasadena, California.Read More
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81$5,000+10 - 49 employeesSanta Clara, CAFounded in 2012, Dynamicsoft Inc. Is a small Santa Clara, California-based software development firm. Their services include Custom Software Development and Mobile App Development.Read More
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82$250,000+1,000 - 9,999 employeesSanta Clara, CAInfostretch is a large Application Testing company headquartered in Santa Clara, California and New York, New York. Their services include Application Testing and Enterprise App Modernization.Read More
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83$10,000+2 - 9 employeesSan Diego, CATeqEngine is an IT strategy consulting company headquartered in San Diego, California. Launched in 2022, the team focuses on IT strategy consulting and cloud consulting & SI.Read More
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84$25,000+50 - 249 employeesSan Francisco, CAInnovify is an artificial intelligence development company. Founded in 2011, the midsize agency is located in London, England; San Francisco, California; Austin, California and New York, New York. Their services include Artificial Intelligence, AI Consulting, Custom Software Development, IT strategy consulting, and more.Read More
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ARM INCIndustries
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85Undisclosed10,000+ employeesSan Francisco, CAFounded in 1993, Thoughtworks Software Technologies Ltd is a large Chicago, Illinois-based AI company. Their team offers Artificial Intelligence and IT managed services.Read More
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86$1,000+Freelancer employeesSan Mateo, CARead More
GCX Solutions is a product development firm headquartered in San Mateo, CA. Founded, in 2018, their team of approximately 1–2 employees mostly serves small clients and some mid-sized businesses. Within the scope of product development, their specialties include custom software and UX/UI design.
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Momentum Design LabIndustries
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87Undisclosed2 - 9 employeesSanta Ana, CALaunched in 2007, AES Global, Inc. Is a small Santa Ana, California-based Enterprise App Modernization company. Their team focuses on Enterprise App Modernization and IT managed services.Read More
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88$25,000+250 - 999 employeesSan Francisco, CAHelpware Tech is a midsize San Francisco, California-based IT strategy consulting company. They provide IT strategy consulting, IT staff augmentation, Custom Software Development, Web Development, and more and were founded in 2015.Read More
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Google Microsoft PWC CompIQIndustries
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89Undisclosed10 - 49 employeesOrange, CABased in Orange, California, Omni Integration is an IT managed services company. The team offers IT managed services and Enterprise App Modernization.Read More
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90Undisclosed50 - 249 employeesSan Francisco, CASiliconMint is a San Francisco, California-based software development firm. Launched in 2012, the team focuses on Custom Software Development and Web Development.Read More
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