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

flowmondo
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Recognized as the leading AI Automation Agency for the UK and Europe on Zapier.com, we assist technical service companies in reducing manual tasks, recovering billable hours, and enabling their teams to focus on business development. Tailored for Project-Based Businesses If your operations rely on j
Highlights
$5,000+
Min Project Size
$150+/hr
Avg Hourly Rate
10-49
Employees
Services Provided+4 Services
13% Robotic Process Automation (RPA)
7% AI Strategy & Roadmap Consulting
5% Other IT Consulting and SI
15% Workflow Automation (Zapier / Make / n8n)
AI Summary
“flowmondo is a leading UK-based AI automation agency specializing in streamlining administrative tasks for technical service companies, enhancing productivity and enabling focus on business growth.”
Gustavsson Development
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At Gustavsson Development, we prioritize delivering a customized development experience for our clients. Gone are the times of lengthy, tedious meetings and soaring invoices. With GDEV, we're here to help you reach your objectives! Feel free to reach out to us.
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Malmo, Skane, Se
Services Provided
50% Custom Web Application Development
30% API Development & Integration
20% Mobile App Development (iOS & Android)
AI Summary
“Gustavsson Development offers tailored software development services focused on efficient, client-centered solutions, eliminating lengthy processes to help clients achieve their goals effectively.”
Mosaictech
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Mosaictech is an IT solutions provider located in Limassol that specializes in payment gateway software and transaction-based platforms. We assist fintech companies, payment providers, and digital businesses in designing and developing payment infrastructures that accommodate various payment methods
Highlights
$50-99/hr
Avg Hourly Rate
10-49
Employees
Mesa Geitonia, Cy
Services Provided
20% Custom Web Application Development
30% API Development & Integration
35% DevOps Engineering
15% Managed IT Services
AI Summary
“Mosaictech delivers tailored payment gateway solutions and infrastructure for fintech and digital businesses, ensuring compliance, reliability, and scalability with over 15 years' global experience.”
Frontmen
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With more than 20 years of experience, we take pride in serving various industries including retail, finance, and healthcare. Our dedication to quality and transparency in project management has garnered the trust of well-known international brands like METRO, McDonald's, Porsche, Microsoft, and LG,
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kyiv, Ua
Services Provided
25% API Development & Integration
40% Custom Web Application Development
20% Mobile App Development (iOS & Android)
15% E-Commerce Development
AI Summary
“Frontmen leverages over 20 years of experience to deliver quality, transparent project management and technology solutions across retail, finance, healthcare, and diverse industries, serving renowned global brands.”
NodeForge
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NODEFORGE: DIGITAL SOLUTIONS AND SYSTEM INTEGRATIONS At NodeForge, we turn innovative concepts into efficient digital products. As a comprehensive agency, we concentrate on contemporary software that enables businesses to expand and streamline intricate processes. We offer complete technology soluti
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
35% API Development & Integration
50% Custom Web Application Development
15% E-Commerce Development
AI Summary
“NodeForge specializes in developing tailored, innovative digital solutions and system integrations, helping businesses streamline complex processes and achieve specific technology-driven objectives.”
cowebs.lb
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Cowebs is a development studio focused on software and web solutions, specializing in contemporary websites, web applications, SaaS platforms, and tailored business software. We create swift, scalable, and secure solutions utilizing technologies such as React, Next.js, Node.js, and Python to assist
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% Custom Web Application Development
30% API Development & Integration
20% E-Commerce Development
AI Summary
“Cowebs.lb is a development studio specializing in modern websites, web applications, and SaaS platforms using technologies like React, Node.js, and Python to deliver scalable, secure business solutions.”
LikeChuck
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LikeChuck is a technology partner that assists businesses in transforming concepts, requirements, and operational hurdles into effective digital solutions. We cater to startups, small to medium-sized businesses, and expanding organizations by offering straightforward tech services that advance proje
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% Custom Web Application Development
15% Mobile App Development (iOS & Android)
35% API Development & Integration
AI Summary
“LikeChuck partners with startups and SMBs to deliver scalable digital solutions including websites, custom software, integrations, dashboards, and MVPs, ensuring user-friendly technology aligned with business goals.”
"Alpha Bots"
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Alpha-Bots is a Ukrainian company focused on software development. Our team specializes in creating web applications for sectors such as fintech, logistics, education, and e-commerce. We develop API integrations with various third-party services, design chatbots, and utilize blockchain technology to
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Mykolaiv, Ua
Services Provided
50% Custom Web Application Development
30% API Development & Integration
20% Blockchain & Web3 Development
AI Summary
“Alpha Bots is a Ukrainian software development company specializing in web applications, API integrations, chatbots, and blockchain solutions for diverse industries including fintech, logistics, and e-commerce.”
Codolis B.V.
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Codolis B.V. is dedicated to offering customized software development services and skilled engineering professionals to assist companies in their technological transformation. We handle complete project execution, from initial concept to final delivery, across diverse industries. Our highly skilled
Highlights
$75,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Best, North Brabant, Nl
Services Provided
50% Custom Web Application Development
20% Mobile App Development (iOS & Android)
30% API Development & Integration
AI Summary
“Codolis B.V. provides tailored software development and engineering expertise across industries, leveraging diverse technologies to deliver innovative solutions that drive digital transformation and operational efficiency.”
DataGrout
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DataGrout is a platform for integrating AI agents that connects enterprise applications through a single, unified endpoint, allowing for smooth automation and scalable workflows. As modern businesses increasingly grapple with the complexities of integrating AI agents with various systems, APIs, and
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Services Provided
33% AI Agent & Multi-Agent System Development
17% Custom AI Chatbot Development
35% API Development & Integration
15% Custom Web Application Development
AI Summary
“DataGrout unifies AI agent integration across enterprise applications via a single API, enabling scalable, secure automation and streamlined workflows to enhance operational efficiency and deployment speed.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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