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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8,490 Companies

List of the Best API Development & Integration Agencies

Sitesoch LLP
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We provide a comprehensive array of web and mobile app development services, as well as printing solutions, aimed at enhancing the operations of the small and medium-sized businesses we partner with.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Mumbai, Maharashtra, In
Services Provided+3 Services
25% API Development & Integration
10% Digital Strategy
5% Email Marketing & Automation
8% Social Media Marketing
AI Summary
“Sitesoch LLP delivers comprehensive web and mobile app development alongside printing solutions, supporting small and medium-sized businesses to improve their operational efficiency and reach.”
Desai Software
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At Desai Software, we redefine what it means to achieve excellence in web and app development, continually enhancing our clients’ success with innovative solutions. Guided by our core principles of precision, efficiency, and a vibrant work culture, we are dedicated to producing impactful results. Ou
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Surat, Gujarat, In
Services Provided
35% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% API Development & Integration
15% E-Commerce Development
AI Summary
“Desai Software specializes in custom web and app development, delivering innovative, efficient, and tailored solutions that drive client success through expertise and commitment to excellence.”
Qlaunch GmbH
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Our goal is to create high-quality mobile applications that will improve your services and offer contemporary solutions throughout all stages of life. Qlaunch is dedicated to delivering cutting-edge mobile app solutions to businesses, ensuring an enhanced user experience at every level.
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
60% Mobile App Development (iOS & Android)
15% API Development & Integration
15% Custom Web Application Development
10% E-Commerce Development
AI Summary
“Qlaunch GmbH delivers high-quality mobile and web applications, including AR/VR and e-commerce solutions, leveraging cutting-edge technology to enhance user experiences across digital platforms.”
Advanced Software Development (ASD Team)
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The ASD Team collaborates with companies that have an established software product and need to continue its development without making each update a potential risk. Many products reach a stage—sometimes even before they are fully live—where integrations become more complicated, releases require heig
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Chernivtsi, Chernivtsi, Ua
Services Provided+5 Services
13% Custom Web Application Development
15% API Development & Integration
10% Backend Development
8% Frontend Development
AI Summary
“Advanced Software Development (ASD Team) specializes in stabilizing and advancing established software products, focusing on risk management and reliability across Travel, Transportation, and Fintech sectors.”
DevIQ
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DevIQ is a specialized consultancy focusing on software and data engineering, dedicated to creating, developing, and implementing cutting-edge AI-driven solutions. We help our clients enhance their initiatives, enabling them to grow, innovate, and remain competitive. Our enduring reputation for exce
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Denver, Colorado, Us
Services Provided+3 Services
10% AI Agent & Multi-Agent System Development
8% AI Strategy & Roadmap Consulting
15% Machine Learning Model Development
20% Digital Strategy
AI Summary
“DevIQ is a specialized consultancy delivering AI-driven software modernization, digital strategy, and enterprise solutions that foster innovation, growth, and competitive advantage across industries.”
IntexSoft
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IntexSoft began in 2001 as a modest startup with just four Java developers. Today, we have a team of over 350 specialists, offering comprehensive software development services to businesses and technology firms. By collaborating closely with clients, we thoroughly understand their business requireme
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Wroclaw, Pl
Services Provided
40% Custom Web Application Development
15% E-Commerce Development
30% Backend Development
15% API Development & Integration
AI Summary
“IntexSoft, founded in 2001, delivers comprehensive software development services with expertise in app modernization, technology updates, and client-focused solutions through a skilled team.”
EGO Digital Agency
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EGO Digital is a worldwide software company established in 2011, with a significant presence in the U.S. market. We support businesses in building, automating, and scaling with confidence. Serving everyone from startups to large enterprises, we provide impactful digital products and automation solut
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Tel Aviv-Yafo, Il
Services Provided+2 Services
23% API Development & Integration
10% E-Commerce Development
14% Product UX Strategy
7% UX Research & Usability Testing
AI Summary
“EGO Digital Agency, established in 2011, delivers scalable software solutions including AI automation, UX/UI design, and API integrations, empowering diverse businesses from startups to enterprises globally.”
Ambient Infotech
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Ambient Infotech stands as India’s premier Web Development Company, driven by our commitment to creating meaningful digital experiences. Our mission is straightforward: to assist businesses in thriving online. In just 8 years, we have successfully completed over 800 web development projects. Among o
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Jaipur, Rajasthan, In
Services Provided
40% E-Commerce Development
15% API Development & Integration
30% Custom Web Application Development
15% Mobile App Development (iOS & Android)
AI Summary
“Ambient Infotech is an Indian web development firm providing e-commerce, custom software, mobile apps, SEO, and digital marketing services, committed to delivering impactful online business solutions.”
Masterpiece Designs
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Masterpiece Designs is a digital studio located in Cape Town, South Africa, that specializes in creating high-performance mobile applications using Flutter, supported by scalable Laravel APIs. We design and develop cross-platform mobile apps that operate natively on both iOS and Android from a singl
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Cape Town, Western Cape, Za
Services Provided
60% Mobile App Development (iOS & Android)
20% Custom Web Application Development
20% API Development & Integration
AI Summary
“Masterpiece Designs is a Cape Town digital studio creating high-performance, cross-platform mobile apps with Flutter and scalable Laravel APIs, serving global SMEs, startups, and enterprises.”
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Tewanay Engineering PLC
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Tewanay is built around a streamlined and adaptable development strategy, operating in a quick, flexible, and client-focused setting. The company boasts a skilled group of Front-end Engineers, Back-end Engineers, AI Engineers, and Android Developers, all dedicated to providing exceptional software s
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Addis Ababa, Addis Ababa, Et
Services Provided
30% Custom Web Application Development
30% Mobile App Development (iOS & Android)
25% API Development & Integration
15% E-Commerce Development
AI Summary
“Tewanay Engineering PLC specializes in flexible, client-focused software development with expertise in front-end, back-end, AI, and Android engineering, delivering tailored technological solutions.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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