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

Trinity Mobile App Lab
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Trinity Mobile App Lab is dedicated to developing mobile applications. We concentrate on creating corporate mobile apps that facilitate process automation. Our application enables you to automate different procedures within your organization, optimizing operations and boosting efficiency. It is desi
Highlights
$1,000+
Min Project Size
10-49
Employees
Noida, Uttar Pradesh, In
Services Provided
60% Mobile App Development (iOS & Android)
20% API Development & Integration
10% E-Commerce Development
10% Custom Web Application Development
AI Summary
“Trinity Mobile App Lab develops tailored mobile applications for MSMEs and SMEs, automating business processes to optimize operations, integrate workflows, and enhance productivity efficiently.”
Archanis Ltd
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We create, develop, upgrade, and maintain applications that ensure your business operates smoothly, securely, and at scale. Whether dealing with intricate legacy systems or cloud-compatible modern applications, we provide effective solutions.
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% Custom AI Chatbot Development
25% API Development & Integration
25% Custom Web Application Development
AI Summary
“Archanis Ltd. specializes in developing and maintaining scalable, secure applications across legacy and modern platforms, ensuring smooth business operations with tailored technology solutions.”
int2code GmbH
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Int2Code consists of a dedicated team of C/C++ software developers with significant experience in the automotive and avionics sectors. We take pride in providing high-performance embedded software solutions, prioritizing quality over quantity and delivering clean, robust source code. Our Core Serv
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Regensburg, Bavaria, De
Services Provided
10% Custom Web Application Development
20% API Development & Integration
60% Legacy System Modernization
10% QA & Software Testing
AI Summary
“int2code GmbH specializes in high-performance embedded C/C++ software for automotive and avionics, emphasizing quality, robust code, client collaboration, and project ownership to ensure successful outcomes.”
AJ Nodes
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As a leading web application design agency in the UK, our skilled team of engineers and innovators is ready to create your next web application, allowing you to concentrate on managing your business while we handle the technology. **History:** We have successfully completed over 200 projects and c
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Crawley, Gb
Services Provided
60% Custom Web Application Development
10% Mobile App Development (iOS & Android)
20% API Development & Integration
10% E-Commerce Development
AI Summary
“AJ Nodes is a UK-based web application design agency with over 200 projects completed, offering expert development and design services through a dedicated multidisciplinary team.”
west solutions
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Web Architecture - API Creation and Development - Content Management System Creation - Tailored Frontend and Backend Development - Jamstack Framework - Microservices Architecture Web Design - Brand Identity and Visual Design - Landing Page Creation and Conversion Rate Improvement - Adaptive Web Desi
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Lviv, Lviv, Ua
Services Provided+2 Services
30% Custom Web Application Development
5% E-Commerce Development
5% Mobile App Development (iOS & Android)
25% API Development & Integration
AI Summary
“West Solutions is a Ukraine-based firm offering custom software development, API creation, web and mobile application design, IT consulting, and cybersecurity services for diverse industries.”
VPVWS
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The VPVWS Modular SaaS Platform for Immigration Law Firms assists immigration attorneys in optimizing case management, client intake, status monitoring, and communication. It offers secure, modular tools that can be seamlessly integrated into their website or client portal, designed with top-notch m
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Services Provided
30% API Development & Integration
20% Custom Web Application Development
28% Other IT Consulting and SI
22% Cloud Consulting & SI
AI Summary
“VPVWS provides a secure Modular SaaS platform that streamlines immigration law firm operations, enhancing case management, client intake, status tracking, and communication through integrated tools.”
Velebit AI
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Velebit AI is an agency focused on AI development, serving as a committed partner throughout your entire AI implementation process. With more than a decade of experience in Machine Learning, Deep Learning, and Data Science, we are devoted to delivering AI solutions that produce tangible business res
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Zagreb, Grad Zagreb, Hr
Services Provided+2 Services
13% AI Strategy & Roadmap Consulting
10% Custom AI Chatbot Development
20% Machine Learning Model Development
7% Generative AI
AI Summary
“Velebit AI is a dedicated agency specializing in AI development, leveraging over a decade of expertise to deliver customized machine learning and data science solutions that drive measurable business impact across industries.”
Tri-Star Design, Inc.
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ISO 13485:2016 Certified, Tri-Star Design is equipped to handle your project—be it electronic, mechanical, or software—from its initial concept to the final product. Our team is fully prepared to tackle any design challenge, utilizing their engineering skills and tools to achieve the results you des
Highlights
10-49
Employees
Hopkinton, Massachusetts, Us
Services Provided
30% Custom Web Application Development
20% API Development & Integration
50% Product Design
AI Summary
“Tri-Star Design, ISO 13485:2016 certified, offers comprehensive product development including electronic, mechanical, and software engineering across medical, robotics, consumer, and military sectors.”
AppStream Studio
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We help your team tackle the AI challenges they're facing. Many organizations recognize the necessity of Generative AI, but few know how to begin, what to create, or how to implement it effectively without wasting six months on a proof of concept that remains unused. That's our role.
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Nashville, Tennessee, Us
Services Provided
30% Custom Web Application Development
20% API Development & Integration
50% Generative AI
AI Summary
“AppStream Studio assists organizations in effectively adopting Generative AI by guiding teams through challenges, enabling practical implementation without lengthy, unused proof of concept phases.”
iQ3Connect
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Starting with new immersive and XR training software can be daunting. Whether you're creating experiences for the first time or implementing them across a global workforce, iQ3Connect offers services designed to mitigate risk, speed up deployment, and provide measurable returns on investment. We col
Highlights
$1,000+
Min Project Size
10-49
Employees
Woburn, Massachusetts, Us
Services Provided
30% Custom Web Application Development
20% API Development & Integration
50% Digital Strategy
AI Summary
“iQ3Connect delivers immersive, device-agnostic XR training solutions with seamless LMS integration and expert support, enabling global organizations to accelerate deployment, reduce risk, and achieve measurable business outcomes.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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