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

Oktana
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Oktana is a technology consulting company focused on creating AI-driven systems that enhance real business operations. We go beyond standard development practices by integrating artificial intelligence into essential processes, turning software into systems capable of automating decisions, optimizin
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Services Provided+4 Services
20% Custom Web Application Development
20% API Development & Integration
10% ERP & CRM Development
13% AI Strategy & Roadmap Consulting
AI Summary
“Oktana specializes in AI-driven technology consulting, delivering scalable enterprise solutions across cloud, data, and Salesforce platforms to optimize business operations and enable intelligent automation.”
CODICODE D.O.O.
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We are an innovative development firm focused on creating high-quality web and mobile applications that enhance efficiency and foster innovation. Our specialization is in utilizing cutting-edge technologies to develop strong, scalable, and dependable solutions that help our clients save time and mon
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Zapresic, Hr
Services Provided
20% API Development & Integration
14% Mobile App Development (iOS & Android)
33% Web App UI Design
33% DevOps Engineering
AI Summary
“CODICODE D.O.O. specializes in innovative web and mobile app development, delivering scalable, reliable solutions that enhance efficiency and drive client innovation using advanced technologies.”
Imaginary Cloud
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We design technology that is built to scale. Our proprietary development processes guarantee reliable, user-centered solutions that drive seamless digital transformation for Enterprise and Scale-up companies.That is what we call seamless technology. We have helped many customers achieve growth such
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
London, England, Gb
Services Provided+2 Services
15% Custom Web Application Development
13% API Development & Integration
5% E-Commerce Development
10% Backend Development
AI Summary
“Imaginary Cloud delivers scalable, user-centric technology solutions enabling digital transformation for enterprises and scale-ups, recognized for rapid growth and excellence over 13 years and 300+ projects.”
Anjaneya TechHub
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An IT company that has offered Java-based web solutions and mobile application services for more than five years.
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
25% API Development & Integration
50% Custom Web Application Development
25% Mobile App Development (iOS & Android)
AI Summary
“Anjaneya TechHub is an IT company specializing in Java-based web solutions and mobile application development, delivering innovative technology services for over five years.”
Varbintech
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High-impact solutions go beyond just coding; they focus on addressing genuine issues that impact your business. We believe that technology should facilitate your growth rather than hold you back. Clients choose to work with us because we offer more than just coding services. We assist your business
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% API Development & Integration
23% Custom Web Application Development
7% E-Commerce Development
50% IT Staff Augmentation
AI Summary
“Varbintech delivers comprehensive technology solutions that enhance business intelligence, efficiency, and growth through quality coding, timely delivery, and strong client collaboration globally.”
Tuxon
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Tuxon is a company focused on developing personalized web and mobile applications. With two decades of experience, we provide customized solutions designed to address the unique requirements of businesses. The company utilizes the MPS-BR model, implementing project management and requirements engine
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
15% API Development & Integration
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
50% IT Staff Augmentation
AI Summary
“Tuxon specializes in creating personalized web and mobile applications, leveraging two decades of experience and the MPS-BR model for tailored, efficient project delivery aligned with client needs.”
Kellton
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Kellton is a prominent global technology solutions provider that has been empowering businesses with innovative technology since 2009. With a workforce of over 2,000 expert professionals worldwide, we aim to assist organizations—from funded startups to Fortune 500 companies—in transforming, expandin
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
1000-9999
Employees
Reston, Virginia, Us
Services Provided+8 Services
15% Custom Web Application Development
8% Mobile App Development (iOS & Android)
18% API Development & Integration
10% BI & Big Data Consulting & SI
AI Summary
“Kellton is a global technology provider delivering custom software, AI-driven solutions, and intelligent automation to drive digital transformation, business growth, and enhanced customer experiences across industries.”
Adaca
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Adaca collaborates with medium to large enterprises and government organizations to provide outstanding software development results through top-tier engineering teams and AI-enhanced capabilities. Established in 2015, we have gained a reputation for fostering strategic partnerships rather than mere
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Sydney, New South Wales, Au
Services Provided+1 Services
25% Custom Web Application Development
15% API Development & Integration
10% Legacy System Modernization
20% AI Strategy & Roadmap Consulting
AI Summary
“Adaca partners with medium to large enterprises and government bodies, delivering superior software development via elite engineering teams skilled in AI, cloud, integration, and security.”
MagnusMinds IT Solution LLP
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MagnusMinds specializes in developing scalable, customized software solutions for both startups and large enterprises. Since 2009, we have been empowering businesses from our offices in India and the United States. We have successfully provided enterprise-grade solutions across various sectors, incl
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Ahmedabad, Gujarat, In
Services Provided+1 Services
15% API Development & Integration
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
30% CRM Consulting and SI
AI Summary
“MagnusMinds IT Solution LLP delivers scalable, customized software solutions across diverse sectors with over 20 years' expertise and skilled teams in India and the US.”
DevGrid
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DevGrid is a comprehensive software development firm located in the United Kingdom, with two operational centers in Brazil. We foster innovation and digital transformation by merging our robust company culture and skilled engineers with your visionary business ideas.
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
London, England, Gb
Services Provided+1 Services
15% API Development & Integration
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
30% IT Staff Augmentation
AI Summary
“DevGrid is a UK-based software development firm with centers in Brazil, delivering innovative digital transformation through skilled engineers and a strong company culture aligned with client visions.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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