Top 30 API Development Services
The Best of December 2025Looking for a top API developer?
With their in-depth knowledge of API technologies, programming languages, and industry best practices, API developers help businesses design, build, and deploy custom APIs that meet their specific business requirements. By collaborating with API development professionals, businesses can unlock new opportunities for data sharing, automation, and integration.
That's why we've created this list of the best API developers for you to review. Read through company descriptions, former clients, and notable projects to find the best fit for your business.
List of the Best API Development Companies
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1$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
Clients
Science37 BrainCorp Red Bull - Multiple Projects Apple/BeatsIndustries
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2$10,000+50 - 249 employeesLos Angeles, CARead More
Web design agency DigiNeat Smart Technologies was established in 2024. Their midsize team is in Los Angeles, California and Yerevan, Armenia. Their services include Web Design, UX/UI Design, Web Development, Mobile App Development, and more.
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3$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
Clients
banking E-commerce health LogisticsIndustries
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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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5Undisclosed10 - 49 employeesLos Angeles, CARead More
QualityWorks Consulting Group is a software development company headquartered in Los Angeles with an office in Jamaica. Founded in 2010, the team of 28 specializes in application testing, other IT consulting and SI, and application management and support. They work mainly with small businesses, focusing on financial services, healthcare and medical, and telecommunications.
Clients
dpdIndustries
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6$1,000+50 - 249 employeesAnaheim, CARank Sol, a branding firm, is located in Faisalabad, Pakistan and Anaheim, California. The midsize team offers branding, search engine optimization, web design, ux/ui design, and more and was founded in 2009.Read More
Industries
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7$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
Clients
Sharge Valinity GigsIndustries
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8$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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9$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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10$5,000+10 - 49 employeesSanta Monica, CASofrix is a website development firm established in 2021. Their team provides Web Development and Mobile App Development.Read More
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11$50,000+10 - 49 employeesLos Angeles, CAMetastability Inc is a custom software development company. The team focuses on Custom Software Development and Mobile App Development, and the firm is in Los Angeles, California.Read More
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12Undisclosed1,000 - 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
Industries
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13Undisclosed10 - 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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14$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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15Undisclosed2 - 9 employeesGlendale, CAEstablished in 2010, toKernel is a web design agency. Their services include Web Design and Custom Software Development.Read More
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16Undisclosed250 - 999 employeesCulver City, CACustom software development firm Test Pro is located in Culver City, California. The team specializes in Custom Software Development and Application Testing.Read More
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17$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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18Undisclosed50 - 249 employeesPasadena, CAMidsize big data analytics company New Digital IT Inc., is based in Pasadena, California. Their services include BI & big data consulting & SI and cloud consulting & SI.Read More
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19$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.
Industries
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20Undisclosed2 - 9 employeesMarina del Rey, CALaunched in 2020, Aegis Studio, a small Blockchain Marketing company, is located in Marina del Rey, California. Their services include Blockchain Marketing and Blockchain.Read More
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21$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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22Undisclosed250 - 999 employeesIrvine, CALaunched in 2015, Arctiq is a midsize IT strategy consulting company. Their services include IT strategy consulting and unified communications consulting & SI.Read More
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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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24Undisclosed2 - 9 employeesIrvine, CAMethod Data Science is a small business intelligence company. They specialize in BI & big data consulting & SI and Web Development and were launched in 2018.Read More
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25Undisclosed2 - 9 employeesIrvine, CAMoonMist.io is a social media marketing company. Established in 2022, their team focuses on Social Media Marketing and Pay Per Click.Read More
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26Undisclosed10 - 49 employeesIrvine, CAStratus Meridian is a cloud consulting & SI company. Their small team is in Irvine, California. Their team specializes in cloud consulting & SI and API Development.Read More
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27Undisclosed250 - 999 employeesNewport Beach, CAExavalu is an IT strategy consulting company. Launched in 2018, the agency offers IT strategy consulting and CRM consulting and SI.Read More
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28Undisclosed10 - 49 employeesThousand Oaks, CADefined Ventures, Inc. Is a web design agency. Established in 2009, their team provides Web Design and CRM consulting and SI.Read More
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