Top API Development & Integration Firms

API development and integration firms build the interfaces that let software talk to other software, and wire up the ones that already exist. Work ranges from designing REST, GraphQL or gRPC APIs for a product or partner program to connecting payment gateways, CRMs, ERPs, shipping carriers, messaging platforms and banking or healthcare systems through their published APIs. Companies hire for it when staff retype data between two systems, when partners want programmatic access, or when a monolith is being split into services.

Compare firms here on the systems they have integrated before, the documentation they hand over, and how they handle authentication, versioning and outages when a third-party API fails.

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We evaluate companies on verified profile data: services, pricing, locations, and portfolio. Client reviews are being collected. We may earn a fee for some placements. How we rank and verify

8,490 Companies

List of the Best API Development & Integration Agencies

GIS-point
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At GIS-point, we offer customized geospatial and IT solutions tailored to your business requirements. Our services include: - **Application Development:** Creating applications from the ground up with an emphasis on high performance and user-friendly interfaces. - **Feature Enhancement & Debugging:
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
London, England, Gb
Services Provided
50% Custom Web Application Development
30% API Development & Integration
10% Mobile App Development (iOS & Android)
10% E-Commerce Development
AI Summary
“GIS-point delivers customized geospatial and IT solutions, specializing in full-cycle application development, testing, support, and cloud-based micro-service architectures for efficient, timely projects.”
Dazlab
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At Dazlab, we are both creators and developers, serving as your reliable technology partner for software and innovation. Our expertise lies in developing SaaS products and tailored solutions that cater to your specific requirements, ensuring that your technology works effectively for you. Whether yo
Highlights
$50,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Bateau Bay, New South Wales, Au
Services Provided
60% Custom Web Application Development
30% API Development & Integration
10% Legacy System Modernization
AI Summary
“Dazlab is a technology partner specializing in SaaS products, custom software, CMS-based websites, and web/mobile applications, delivering tailored solutions to advance your business efficiently.”
Robin Herbeck
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You take care of design and communication while I focus on the technology. Everything is quick, efficient, and explained as if I were physically present with you. User-friendly backends and high-performing frontends.
Highlights
$50-99/hr
Avg Hourly Rate
Heilbronn, Baden Wurttemberg, De
Services Provided
55% Custom Web Application Development
30% API Development & Integration
15% E-Commerce Development
AI Summary
“Robin Herbeck specializes in delivering efficient technology solutions with user-friendly backends and high-performing frontends, emphasizing clear communication and collaborative design processes.”
Codivo
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Codivo is a specialized firm in Umbraco and .NET, assisting organizations in creating, managing, and enhancing digital platforms with innovative, integrated solutions. We blend our technical knowledge with a team-oriented approach to achieve scalable and sustainable outcomes.
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
Zwolle, Nl
Services Provided
70% Custom Web Application Development
30% API Development & Integration
AI Summary
“Codivo specializes in Umbraco and .NET solutions, delivering innovative, scalable digital platforms through technical expertise and collaborative, sustainable approaches for diverse organizational needs.”
Coreblue
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Whether you require assistance in prototyping an idea, creating a minimum viable product (MVP), or scaling a comprehensive enterprise application, we support you through every phase of the development process. Coreblue is a team of technology experts based in the UK, specializing in custom software
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
London, England, Gb
Services Provided
50% Custom Web Application Development
25% Mobile App Development (iOS & Android)
25% API Development & Integration
AI Summary
“Coreblue is a UK-based technology expert team providing end-to-end custom software development services, from ideation and MVP creation to scalable enterprise solutions and ongoing support.”
SolidWeb
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I operate SolidWeb as an independent developer focused on building dependable, top-notch websites for small and medium-sized enterprises. By blending modern technology with effective communication and ongoing support, I guarantee that each project is stable, secure, and user-friendly. Whether it's d
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Budapest, Budapest, Hu
Services Provided
70% Custom Web Application Development
30% API Development & Integration
AI Summary
“SolidWeb specializes in creating reliable, secure websites for small and medium enterprises, offering development, maintenance, and security services tailored to client business goals.”
ContentReactor GmbH
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We create tailored digital platforms, e-commerce solutions, and websites utilizing Craft CMS and Craft Commerce. Our emphasis is on uniqueness, efficiency, and dependability, ensuring outstanding usability for both content creators and end users, along with strong security measures. We view digital
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Vienna, Vienna, At
Services Provided
75% Custom Web Application Development
25% API Development & Integration
AI Summary
“ContentReactor GmbH develops customized digital platforms, e-commerce solutions, and websites with Craft CMS, focusing on usability, security, efficiency, and enhancing clients' digital business workflows.”
Kaşgar Yazılım
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Kaşgar Yazılım is a software development firm based in Ankara, boasting over 15 years of experience in creating tailored software solutions. Our team offers comprehensive services, including custom software and web application development, digital transformation, as well as ongoing maintenance and s
Highlights
2-9
Employees
Ankara, Ankara, Tr
Services Provided
75% Custom Web Application Development
25% API Development & Integration
AI Summary
“Kaşgar Yazılım is a seasoned Ankara-based software firm delivering custom, scalable, and secure solutions with modern technologies, supporting diverse sectors through Agile and CI/CD methodologies.”
Echo Technologies
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At Echo Technologies, we excel in utilizing artificial intelligence (AI) to enhance automation in various business processes. Our customized software solutions are carefully designed to address the specific requirements and goals of each client. By employing advanced AI algorithms, we improve workfl
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
San Salvador, San Salvador, Sv
Services Provided+3 Services
18% Mobile App Development (iOS & Android)
33% API Development & Integration
15% Robotic Process Automation (RPA)
5% IT Staff Augmentation
AI Summary
“Echo Technologies specializes in AI-driven automation and customized software solutions, enhancing business workflows, productivity, and scalability to support sustainable growth and operational efficiency.”
iKemo
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iKemo creates personalized BI dashboards for businesses in Florida, providing real-time KPI dashboards using Power BI, Metabase, and Looker, customized to fit your data and team. We offer everything from executive dashboards to specialized analytics for industries such as healthcare, finance, and lo
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Fort Lauderdale, Florida, Us
Services Provided+1 Services
33% Business Intelligence (BI) Dashboard Development
4% ERP Consulting and SI
15% AI Strategy & Roadmap Consulting
15% AI Agent & Multi-Agent System Development
AI Summary
“iKemo delivers customized BI dashboards and AI-driven business automation across Florida, empowering industries like healthcare and finance with secure, real-time analytics and measurable growth solutions.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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