Top 30 REST Services in California
The Best of December 2025Looking for a top REST API service in California?
With their deep understanding of REST architecture, API security, and industry best practices, REST API services help businesses design, build, and deploy REST APIs that meet their specific business requirements. By collaborating with REST API service providers, companies can enhance their application's functionality, scalability, and performance, ultimately driving business growth and success.
To assist you in your search for a partner, we’ve compiled this list of the top REST API companies in California. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best California REST API Providers
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1$10,000+10 - 49 employeesIrvine, CARead More
Located in Irvine, California and Fredericksburg, Virginia, CoSpark is an e-commerce development company. They specialize in E-Commerce Development, Web Development, API Development, and Web Design and were launched in 2009.
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2$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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3$50,000+10 - 49 employeesSan Diego, CARead More
Achieve Internet is a software development company that's headquartered in San Diego; they have another office in Los Angeles. Founded in 2002, Achieve Internet does web development, enterprise content management, sales intelligence, enterprise app modernization, CRM consulting, and e-commerce development. Clients are mostly midmarket companies and in the healthcare and arts and entertainment sectors. They have about 41 employees.
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DexcomIndustries
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4$10,000+2 - 9 employeesPasadena, CAGeekOffice, a , was founded in 2019. Headquartered in Sheridan, Wyoming, their small team specializes in.Read More
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5$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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6Undisclosed50 - 249 employeesSan Jose, CAEike Consulting is a software development company. Their team is in San Jose, California and provides Custom Software Development and Mobile App Development.Read More
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7$5,000+2 - 9 employeesDanville, CALaunched in 1999, DLS Solutions, Inc. Is a custom software development company. Their team provides Custom Software Development and UX/UI Design.Read More
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8$25,000+10 - 49 employeesSan Jose, CARead More
Crea is a software development company. They offer custom software development, mobile app development, and api development and were launched in 2017. Their small team is San Jose, California-based.
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9$1,000+10 - 49 employeesSan Francisco, CAZavod-IT is an AI company. Their small team is located in San Francisco, California. Their services include Artificial Intelligence and API Development.Read More
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10$1,000+2 - 9 employeesSan Francisco, CAGeniusHub, a CRM consulting and SI company, was founded in 2018. They offers CRM consulting and SI and AI Consulting.Read More
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11$10,000+10 - 49 employeesRedlands, CAUSDevBrokers is a Redlands, California-based website development firm. They specialize in Web Development and Mobile App Development.Read More
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12$1,000+10 - 49 employeesDiamond Bar, CAFounded in 2017, InfoLake LLC, a small custom software development company, is in Diamond Bar, California. Their team specializes in Custom Software Development and Web Development.Read More
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13Undisclosed1,000 - 9,999 employeesDiamond Bar, CALiferay is an Application Testing company established in 2004. The large team focuses on Application Testing and API Development.Read More
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14$5,000+2 - 9 employeesSan Diego, CAApplication development firm devAtelier offers Mobile App Development and Web Development. They are located in San Diego, California.Read More
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15$100,000+2 - 9 employeesLos Angeles, CALaunched in 2010, Iterate is a small software development company. Their services include Custom Software Development, Mobile App Development, API Development, UX/UI Design, and more. The firm is in Los Angeles, California.Read More
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Sharge Valinity GigsIndustries
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16Undisclosed50 - 249 employeesSan Francisco, CAClarifai, Inc., an AI firm, is based in San Francisco, California. Their services include Artificial Intelligence and Content Moderation Services.Read More
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17$10,000+10 - 49 employeesIrvine, CAEstablished in 2018, Conveyance Solutions is a small Irvine, California-based ERP consulting and SI company. Their team offers ERP consulting and SI and API Development.Read More
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18Undisclosed50 - 249 employeesSan Jose, CAInfobahn Softworld Inc is a cloud consulting & SI company. The agency is based in Toronto, Canada and San Jose, California. Their team focuses on cloud consulting & SI and Application Testing.Read More
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19Undisclosed10 - 49 employeesFresno, CAMertech Data Systems, Inc. Is a small custom software development firm based in Pembroke Pines, Florida and Fresno, California. The team offers Custom Software Development and cloud consulting & SI.Read More
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20Undisclosed2 - 9 employeesCarlsbad, CALaunched in 2020, QADeputy is an Application Testing company. The team provides Application Testing and API Development.Read More
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21$10,000+2 - 9 employeesLa Habra, CAUniversal Informatics LLC, a web development company, was founded in 2024. They are based in La Habra, California and have a small team. Their services include web development, mobile app development, api development, microservices architecture services, and more.Read More
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22Undisclosed10 - 49 employeesSan Diego, CACreatable is a social media marketing agency. Located in San Diego, California, the company focuses on Social Media Marketing and Video Marketing.Read More
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23$10,000+10 - 49 employeesCalgary, CanadaRead More
Algo Clan Inc. Is a software development company. The small Calgary, Canada-based company was founded in 2020. Their services include custom software development, web development, and mobile app development.
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24Undisclosed10 - 49 employeesPasadena, CAWeb design agency Upgrade Consulting focuses on Web Design and UX/UI Design. They were launched in 2023.Read More
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25$1,000+2 - 9 employeesAnaheim, CALaunch Up Labs, a software development firm, was founded in 2024. The agency offers Custom Software Development and Web Development.Read More
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26Undisclosed50 - 249 employeesPalo Alto, CALaunched in 2013, Data Theorem, Inc. Is an app development firm. Their team focuses on Mobile App Development and IT strategy consulting.Read More
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27$50,000+50 - 249 employeesLong Beach, CAEstablished in 2019, bycoders_ is a Low/No Code Development company. Their midsize team is headquartered in Cascais, Portugal; São Paulo, Brazil and Long Beach, California. Their services include Low/No Code Development, IT staff augmentation, Custom Software Development, Web Development, and more.Read More
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banking E-commerce health LogisticsIndustries
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28$50,000+50 - 249 employeesOakland, CACustom software development company Blue Trail Software was founded in 2013. Headquartered in Oakland, California; Tepatitlán de Morelos, Mexico; València, Spain and Resistencia, Argentina, their midsize team specializes in Custom Software Development, Building Security Services, Application Testing, Mobile App Development, and more.Read More
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29$10,000+50 - 249 employeesUnion City, CACloudpacer Inc, a custom software development company, specializes in Custom Software Development and Web Development. The company is in Union City, California and Lahore, Pakistan.Read More
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30$10,000+10 - 49 employeesHuntington Beach, CAAlokin is a software development company founded in 2011. Their services include Custom Software Development and Web Development.Read More
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