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

Openmalo Technologies
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Website creation firm
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Rajkot, Gujarat, In
Services Provided
20% API Development & Integration
30% Custom Web Application Development
25% CRM Consulting and SI
25% Cloud Consulting & SI
AI Summary
“Openmalo Technologies specializes in website creation, delivering tailored web solutions that combine design and functionality to meet diverse client needs across industries.”
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AppCrafters USA
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Harnessing the power of digital innovation, AppCrafters USA stands out as a premier app development firm dedicated to converting concepts into robust and user-friendly applications. Our talented team of developers merges creativity with technical know-how to create state-of-the-art mobile and web so
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided
25% API Development & Integration
50% Custom Web Application Development
5% Blockchain & Web3 Development
20% QA & Software Testing
AI Summary
“AppCrafters USA specializes in developing high-quality, scalable mobile and web applications, combining creativity and technical expertise to transform ideas into user-friendly digital solutions that drive business growth.”
Josh Software
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Since 2007, Josh Software has been assisting clients worldwide in developing their products. Our projects span various sectors, including FinTech, e-commerce, and retail, as we aim to provide genuine value in all our efforts and instill pride in our customers. Based in India, with delivery centers i
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
250-999
Employees
Pune, Maharashtra, In
Services Provided
15% API Development & Integration
20% Mobile App Development (iOS & Android)
15% Custom Web Application Development
50% BI & Big Data Consulting & SI
AI Summary
“Josh Software, established in 2007, delivers diverse software solutions across sectors like FinTech and e-commerce, leveraging expertise in open-source technologies from offices worldwide.”
Atlas Dev Studio
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Atlas Dev Studio is a web development firm specializing in software solutions for startups. We provide flexible services at various price points, emphasizing the creation of scalable and resilient products for growing startups. Our expertise in full stack development and CI/CD allows us to design so
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Paris, Ile De France, Fr
Services Provided
15% API Development & Integration
20% Backend Development
15% Custom Web Application Development
50% Cloud Consulting & SI
AI Summary
“Atlas Dev Studio delivers flexible full stack web development and CI/CD solutions, partnering with startups to create scalable, resilient, and customized software that supports sustainable growth.”
The SaaS Masters
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The SaaS Masters, a web development agency located in the U.S., focuses on creating custom SaaS platforms, integrating APIs, and providing cloud-native solutions for startups, small and medium-sized businesses, as well as large enterprises. We assist clients in transforming their digital ideas into
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Services Provided
35% Custom Web Application Development
15% API Development & Integration
20% Custom AI Chatbot Development
30% Machine Learning Model Development
AI Summary
“The SaaS Masters develops custom SaaS solutions and cloud-native platforms for diverse industries, combining technical expertise and business insight to deliver scalable, compliant, and maintainable software.”
umwerk GmbH
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umwerk Group is a Munich-based specialist in digital services. Since 2012, we have been helping our global clients navigate their digital transformation journeys efficiently and securely. By adopting a comprehensive strategy that includes consulting, conceptualization, design, and technological exec
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Stuttgart, Baden Wurttemberg, De
Services Provided+3 Services
14% API Development & Integration
5% Mobile App Development (iOS & Android)
15% Custom Web Application Development
15% AI Strategy & Roadmap Consulting
AI Summary
“umwerk GmbH is a Munich-based digital services specialist offering consulting, design, and technology solutions to support efficient, secure digital transformation and seamless integration into clients' ecosystems.”
Syed Technologies
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We are excited to provide state-of-the-art web services, such as personalized website design and development, creative app and software solutions, exceptional SEO services, strategic digital marketing, targeted email marketing, and captivating graphic design. Rely on Syed Technology to meet all your
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
25% API Development & Integration
25% Graphic Design
15% Digital Strategy
10% Social Media Marketing
AI Summary
“Syed Technologies offers comprehensive digital solutions in website design, app development, SEO, digital marketing, email campaigns, and graphic design, leading Pakistan's technological advancements.”
ACME Digital Solutions
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Acme Ltd. creates outstanding mobile and web applications for businesses. We blend enthusiasm and expertise to provide the simplest solutions for you. Why choose us? Custom solutions, experienced developers and designers, a focus on user experience, adaptive development, and transparent communicatio
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
20% API Development & Integration
40% Custom Web Application Development
40% Mobile App Development (iOS & Android)
AI Summary
“ACME Digital Solutions specializes in developing custom mobile and web applications, combining expert development, user-centric design, and transparent communication to deliver effective business solutions.”
ConnectUs Infoway Pvt. Ltd.
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ConnectUs Infoway Pvt. Ltd. has been a reliable partner for clients over the years, collaborating closely to prioritize their long-term interests. We consistently fulfill our commitments.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Rajkot, Gujarat, In
Services Provided
35% Custom Web Application Development
25% E-Commerce Development
20% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“ConnectUs Infoway Pvt. Ltd. is a dependable partner committed to meeting client needs through collaborative, long-term solutions and consistently delivering on its promises.”
CBOS (PTY) LTD
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At CBOS, we provide customized software solutions that are secure, scalable, and quickly implemented. From the initial idea to the final launch, we collaborate closely with you to optimize operations, improve customer interactions, and foster innovation. Our process begins by understanding your obje
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
20% API Development & Integration
30% Custom Web Application Development
20% Machine Learning Model Development
15% AI Strategy & Roadmap Consulting
AI Summary
“CBOS delivers tailored, secure software solutions, collaborating closely with clients to enhance operations and innovation, ensuring efficient integration and sustainable business growth.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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