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

Amex Development
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We are a team that specializes in creating custom software solutions. Our services cater to clients worldwide, delivering dependable software. Our company takes a personalized approach with each client, offering tailored development and implementation of custom solutions that enable businesses and s
Highlights
$100,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Samara, Ru
Services Provided
50% Custom Web Application Development
30% Backend Development
20% API Development & Integration
AI Summary
“Amex Development delivers tailored software solutions globally, specializing in fintech, tourism, healthcare, and cloud services, enabling businesses to innovate, expand IT capacity, and rapidly launch projects.”
Karma Technolabs
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We are a software development and consulting company with over a decade of experience, having developed more than 100 web and mobile applications across different industries to fulfill client needs.
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
30% Custom Web Application Development
25% Mobile App Development (iOS & Android)
20% API Development & Integration
15% E-Commerce Development
AI Summary
“Karma Technolabs is a seasoned software development and consulting firm with over ten years' experience, delivering 100+ web and mobile applications across diverse industries to meet client needs.”
UkrDevs
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UkrDevs is a partner in WordPress development that focuses on creating scalable, high-performance websites with a clean architectural design and minimal reliance on plugins. Many WordPress projects depend heavily on plugins, which can cause performance problems, instability, and limited scalability.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% Custom Web Application Development
50% E-Commerce Development
20% API Development & Integration
AI Summary
“UkrDevs delivers custom WordPress development with scalable, high-performance websites, advanced WooCommerce solutions, and custom integrations emphasizing reliability, maintainability, and engineering excellence for diverse clients.”
24Web
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24web is a software development firm entirely funded by Portuguese capital, operating on a global scale due to the nature of our work. We create and execute solutions that add value, offering technological and innovative options tailored to the unique requirements of your business. Our multidiscipli
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Sao Lourenco (Vila Nogueira de Azeitao), Pt
Services Provided
50% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“24web is a Portuguese software development company delivering innovative, tailored technological solutions worldwide, with expertise in implementation and maintenance to meet diverse business challenges.”
NK Labs
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NK Labs is a standalone software studio dedicated to creating scalable SaaS platforms, enterprise applications, and contemporary web systems. Our expertise lies in clean architecture, high performance, and ensuring long-term maintainability, enabling startups and businesses to transform their ideas
Highlights
Services Provided
20% API Development & Integration
25% Custom Web Application Development
5% E-Commerce Development
50% AI Strategy & Roadmap Consulting
AI Summary
“NK Labs specializes in scalable SaaS platforms and enterprise software, emphasizing clean architecture and lean execution by collaborating directly with senior engineers for efficient, cost-effective development.”
HatchWorks AI
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Welcome to HatchWorks - your partner in AI and data transformation. We assist you in harnessing the potential of AI by leveraging your data. While implementing AI can be straightforward, doing it effectively is challenging. We serve as your guide, ensuring you retain control over your strategy and o
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
250-999
Employees
Atlanta, Georgia, Us
Services Provided+3 Services
13% AI Strategy & Roadmap Consulting
10% LLM Integration & Prompt Engineering
10% Custom AI Chatbot Development
10% Machine Learning Model Development
AI Summary
“HatchWorks AI partners with businesses to effectively implement AI and data transformation, guiding strategy while ensuring control and ownership of intellectual property throughout the process.”
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Stellarbase
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We are an international e-commerce agency harnessing outstanding talent from around the globe to assist ambitious brands in thriving through customized commerce solutions and captivating digital experiences.
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Malmo, Skane, Se
Services Provided
30% Custom Web Application Development
20% API Development & Integration
50% E-Commerce Development
AI Summary
“Stellarbase is a global e-commerce agency delivering tailored commerce solutions and engaging digital experiences to help ambitious brands succeed in competitive markets.”
Maze Logic
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About Us We are a comprehensive custom software development agency focused on delivering complete B2B solutions. From initial idea to final launch, we create web platforms, mobile applications, and sophisticated integrations that meet your business requirements. We operate solely as a service prov
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
30% Custom Web Application Development
20% Mobile App Development (iOS & Android)
25% API Development & Integration
15% Backend Development
AI Summary
“Maze Logic specializes in custom B2B software development, delivering tailored web, mobile, and integration solutions through comprehensive service from concept to launch.”
Binary Infotech
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Binary Infotech is a comprehensive software development and IT outsourcing firm that assists businesses in creating scalable, secure, and high-performing digital solutions. We focus on providing personalized web applications, enterprise software, and product development services designed to meet the
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Services Provided
40% Custom Web Application Development
20% Mobile App Development (iOS & Android)
25% API Development & Integration
15% E-Commerce Development
AI Summary
“Binary Infotech delivers tailored software development and IT outsourcing services, creating scalable, secure digital solutions that align technology with business goals to foster client innovation and growth.”
NAVABRIND IT SOLUTIONS - Certified Omnichannel Consultant [Odoo , PIM & Ecommerce]
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Are you prepared to transform your manufacturing or e-commerce business? For over ten years, we have been assisting manufacturers and e-commerce entrepreneurs in improving their operations through our performance-focused Ecommerce and ERP solutions. By leveraging our expertise and top-tier tools lik
Highlights
$10,000+
Min Project Size
50-249
Employees
Chennai, Tamil Nadu, In
Services Provided+2 Services
5% Legacy System Modernization
8% Custom Web Application Development
20% E-Commerce Development
12% API Development & Integration
AI Summary
“NAVABRIND IT SOLUTIONS delivers comprehensive e-commerce and ERP software development, certified omnichannel consulting, and AI-driven automation, empowering diverse industries with tailored, innovative business solutions.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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