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

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Genesee Software Co
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Papertree Design, which eventually evolved into Genesee Software Co., was founded in early 2008. Throughout the years, Jeremy has been involved in a wide range of projects, including e-commerce websites, custom WordPress plugins, RESTful APIs, and cloud-based consumer applications. Alongside his ind
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Delafield, Wisconsin, Us
Services Provided
70% Custom Web Application Development
30% API Development & Integration
AI Summary
“Genesee Software Co., established from Papertree Design, specializes in custom web applications, APIs, and cloud solutions using Laravel, Vue.js, WordPress plugins, and AWS services.”
HONE
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HONE is a product engineering firm that specializes in developing software using Elixir and AWS, bringing extensive knowledge to the table.
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided
60% Custom Web Application Development
30% API Development & Integration
10% E-Commerce Development
AI Summary
“HONE is a product engineering firm specializing in software development with expertise in Elixir and AWS, delivering tailored engineering solutions across diverse technology needs.”
Green Dolphin Software
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Green Dolphin Software is a specialized consultancy focused on enterprise integration, offering AI-enhanced projects in Salesforce, MuleSoft, Dell Boomi, and Workato for Fortune 500 and mid-market clients. The company is known for its fixed-price contracts that are delivered within three business da
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
San Ramon, California, Us
Services Provided+4 Services
12% AI Agent & Multi-Agent System Development
8% AI Strategy & Roadmap Consulting
4% Custom AI Chatbot Development
5% CRM Consulting and SI
AI Summary
“Green Dolphin Software delivers AI-enhanced, fixed-price enterprise integration solutions in Salesforce, MuleSoft, and middleware with rapid turnaround, serving Fortune 500 and mid-market clients remotely across North America.”
PureSoft Solutions
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PureSoft Solutions is a technology firm focused on AI, offering smart and scalable digital solutions. Our team of over 60 professionals has successfully collaborated on more than 100 projects in the US, Europe, the Middle East, and India. We specialize in areas including Generative AI, Agentic AI, a
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Pimpri-Chinchwad, Maharashtra, In
Services Provided+3 Services
7% AI Strategy & Roadmap Consulting
7% Cloud Consulting & SI
7% Machine Learning Model Development
10% Generative AI
AI Summary
“PureSoft Solutions provides AI-driven digital solutions and platforms across diverse sectors, enhancing workflows, customer experiences, and innovation through expertise in automation, cloud, and product engineering.”
PostcardMania
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PostcardMania was founded in 1998 as a postcard marketing company, but it has evolved alongside the changing landscape of marketing over the years. The company aims to provide all the essential tools for business marketing in one place, at an affordable price. While direct mail remains a fundamental
Highlights
250-999
Employees
Clearwater, Florida, Us
Services Provided+4 Services
33% Print Design
33% API Development & Integration
4% Account-Based Marketing (ABM)
7% Social Media Marketing
AI Summary
“PostcardMania offers affordable, integrated marketing solutions combining direct mail and advanced technology to help small businesses nationwide grow through proven, data-driven campaigns.”
Guntur Global Media
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cDoc - Revenue Operating System for Digital Agencies cDoc is a tailored Revenue Operating System designed specifically for digital agencies and service providers. Our platform effortlessly integrates your CRM (HubSpot), project management tools (Asana/Monday.com), and accounting software (Xero) in
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Singaraja, Nusa Tenggara, Id
Services Provided
50% Managed IT Services
30% API Development & Integration
20% Business Consulting Services
AI Summary
“Guntur Global Media offers cDoc, a specialized Revenue Operating System automating digital agencies' workflows by integrating CRM, project management, and accounting to enhance efficiency and reduce errors.”
Syzium
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A nearshore development team that embodies a European work culture, we focus on developing MVPs with React Native and .NET. We successfully created a two-sided marketplace, bringing it from concept to real users within 10 months. We prioritize rapid launches and continue to offer ongoing support and
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% API Development & Integration
70% Custom Web Application Development
AI Summary
“Syzium is a nearshore development team specializing in rapid MVP development using React Native and .NET, offering ongoing support and fostering long-term collaboration with a European work culture.”
IRA Softwares
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IRA Softwares is a company that offers software and technology services, specializing in web development for various industries. The primary goal of the organization is to deliver cost-effective, best-practice solutions to both large and small businesses. IRA Softwares provides the following service
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
70% Custom Web Application Development
30% API Development & Integration
AI Summary
“IRA Softwares delivers cost-effective web and custom software development, specializing in low-code solutions like OutSystems, serving diverse industries with tailored technology services.”
Sneek Digital SRL
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Sneek Digital is a small software development studio led by experienced professionals, dedicated to creating and maintaining dependable, long-term software solutions. The company is founder-operated, ensuring hands-on involvement in all projects. Our core team includes two full-time senior developer
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
60% Custom Web Application Development
30% API Development & Integration
10% Mobile App Development (iOS & Android)
AI Summary
“Sneek Digital is a founder-led software studio specializing in backend and SaaS development with experienced developers, focusing on reliable, long-term, client-oriented software solutions.”
Unax
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Engage our services to seamlessly link software systems from start to finish, automate workflows, create essential API integrations, and offer ongoing support and maintenance. Easily synchronize your product information, including pricing, inventory levels, descriptions, and more.
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Sofia, Sofia, Bg
Services Provided+1 Services
15% Custom Web Application Development
30% API Development & Integration
5% E-Commerce Development
20% UX Research & Usability Testing
AI Summary
“Unax specializes in seamlessly integrating software systems, automating workflows, and providing essential API integrations alongside ongoing support to synchronize product information effectively.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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