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

DiRoots
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DiRoots Limited is a prominent software development firm focused on delivering advanced software solutions tailored for the architecture, engineering, and construction (AEC) industry and manufacturing sectors. We specialize in creating plugins for various Autodesk products, such as Revit, AutoCAD, a
Highlights
$5,000+
Min Project Size
10-49
Employees
Guimaraes, Braga, Pt
Services Provided
50% Custom Web Application Development
40% API Development & Integration
10% Legacy System Modernization
AI Summary
“DiRoots is a Portuguese software firm specializing in tailored solutions for AEC and manufacturing, including Autodesk plugins, web applications, API integration, and legacy system modernization.”
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GearTooth
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GearTooth is a specialized digital solutions company dedicated to developing, implementing, and integrating solutions.
Highlights
$5,000+
Min Project Size
$150+/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
50% API Development & Integration
10% BI & Big Data Consulting & SI
10% Cloud Consulting & SI
10% CRM Consulting and SI
AI Summary
“GearTooth is a specialized digital solutions company offering development, implementation, and integration services across various sectors to enhance business operations and technology adoption.”
adivaha
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Adivaha® is an international travel technology firm dedicated to equipping travel agencies, tour operators, online travel agencies (OTAs), and startups with intelligent, scalable, and dependable digital solutions. We assist travel businesses in transforming their operations by offering comprehensive
Highlights
$1,000+
Min Project Size
10-49
Employees
Services Provided
60% Custom Web Application Development
40% API Development & Integration
AI Summary
“Adivaha® provides scalable, customizable travel technology solutions including booking engines, API integrations, and management tools, empowering agencies and OTAs to enhance efficiency and online growth.”
Globalia Soft LLP
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★ We have proudly completed six years of ensuring client satisfaction. As a prominent Web Development Company, we specialize in Web Applications Development, E-commerce development, CMS Websites, and API Integration, all aimed at fully meeting the needs of our esteemed clients. We deliver high-quali
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Surat, Gujarat, In
Services Provided
50% Custom Web Application Development
35% API Development & Integration
15% ERP & CRM Development
AI Summary
“Globalia Soft LLP is a versatile web development company delivering high-quality applications, e-commerce, CMS, and API integration with expertise in PHP, WordPress, Node.js, and modern technologies.”
Siftia
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Siftia supports healthcare organizations and consulting companies by delivering innovative, data-driven solutions that improve operational efficiency, compliance, and patient outcomes. With expertise in HL7 FHIR interoperability, cloud-based systems, and data product creation, we assist our clients
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Cartago, Cartago, Cr
Services Provided+1 Services
35% API Development & Integration
15% Custom Web Application Development
20% AI Strategy & Roadmap Consulting
20% BI & Big Data Consulting & SI
AI Summary
“Siftia delivers data-driven healthcare solutions including FHIR interoperability, cloud migration, and compliance services, enhancing operational efficiency and patient outcomes for diverse healthcare clients.”
Rubiko
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Rubiko is a software and web development studio located in Oregon, dedicated to creating fast, dependable, and maintainable websites and applications for small businesses. We specialize in Ruby on Rails development, optimizing performance, and custom backend integrations. Our mission is to assist lo
Highlights
$50-99/hr
Avg Hourly Rate
Roseburg, Oregon, Us
Services Provided
40% API Development & Integration
60% Custom Web Application Development
AI Summary
“Rubiko is an Oregon-based development studio specializing in Ruby on Rails, delivering fast, reliable websites and applications to help small businesses modernize and improve online presence.”
Streamlogic Ltd
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Advance your initiatives with Streamlogic’s Cloud and Engineering services, which enhance products and experiences, boost operational efficiency, and speed up time-to-market. We offer extensive expertise in cloud transformation and product engineering to assist organizations in establishing robust d
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
40% API Development & Integration
20% Mobile App Development (iOS & Android)
40% QA & Software Testing
AI Summary
“Streamlogic Ltd. provides expert cloud transformation and product engineering services, enhancing digital infrastructures, boosting efficiency, reducing costs, and accelerating software delivery for long-term business impact.”
Tacta
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Tacta, known as "The Art of Complexity Taming," is a software development firm focused on digitizing and optimizing business processes for large organizations. Headquartered in Brussels, we also have offices in Zagreb and Sarajevo. Our areas of expertise include analysis and management, design, deve
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Woluwe-Saint-Lambert, Be
Services Provided
70% Custom Web Application Development
30% API Development & Integration
AI Summary
“Tacta is a Brussels-based software firm specializing in digitizing and optimizing business processes through analysis, development, and consulting, serving large organizations with innovative solutions for over 15 years.”
Digital Beauty
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At Digital Beauty, our work goes beyond coding; we create digital solutions that transform manual inefficiencies into automated profitability. Located in Romania, we focus on supporting small and medium-sized enterprises (SMEs) by reducing repetitive tasks and simplifying intricate workflows. We rec
Highlights
$50-99/hr
Avg Hourly Rate
2-9
Employees
Oradea, Bihor, Ro
Services Provided
40% Custom Web Application Development
10% Mobile App Development (iOS & Android)
35% API Development & Integration
15% E-Commerce Development
AI Summary
“Digital Beauty delivers automated digital solutions in Romania, empowering SMEs by streamlining workflows, integrating ERP systems, and enhancing business efficiency with scalable, ROI-focused technology.”
Anterec Ltd
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We are the creators of Anterec Developer Cloud® for .NET, the sole pay-as-you-go .NET software development service in the UK. Our skilled team of Microsoft .NET developers is experienced with both MSSQL and Oracle databases, and we have a proven history of delivering business and enterprise-level so
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Bedford, England, Gb
Services Provided
65% Custom Web Application Development
35% API Development & Integration
AI Summary
“Anterec Ltd. provides expert .NET software development, delivering tailored business solutions and integration services across diverse sectors since 2008, supporting enterprise client growth and efficiency.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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