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

S3J Technologies
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S3J Technologies: Your Worldwide Partner in Web Development, App Development, and Digital Marketing Are you seeking to enhance your business with innovative digital solutions? S3J Technologies, a prominent software firm with a global presence, provides a wide array of services designed to fulfill a
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
15% Custom Web Application Development
14% Mobile App Development (iOS & Android)
5% API Development & Integration
33% Search Engine Optimization (SEO)
AI Summary
“S3J Technologies is a global software firm offering web and mobile app development, digital marketing, blockchain solutions, and custom software to deliver innovative, client-focused digital services.”
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Hardin AI Solutions
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Hardin AI Solutions is an AI software and automation agency located in London, focused on assisting small and medium businesses in the UK to grow, compete, and succeed in the era of artificial intelligence. Established in 2024 and registered in England & Wales (Company No. 17149514), we merge extens
Highlights
2-9
Employees
Services Provided+9 Services
10% Custom AI Chatbot Development
4% Generative AI
3% Machine Learning Model Development
5% Robotic Process Automation (RPA)
AI Summary
“Hardin AI Solutions, based in London, provides tailored AI software and automation services to UK SMEs, enhancing efficiency through chatbots, process automation, content generation, and SEO.”
Nextora Solutions
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In today’s rapidly changing market, your business requires more than just applications; it needs smart platforms that boost revenue, enhance operations, and outshine competitors. Nextora, your comprehensive digital innovation partner, provides customized mobile and web solutions designed for scalabi
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Hyderabad, Telangana, In
Services Provided+13 Services
8% Custom Web Application Development
8% Mobile App Development (iOS & Android)
5% API Development & Integration
5% Backend Development
AI Summary
“Nextora Solutions delivers tailored digital platforms and scalable mobile and web applications, empowering diverse industries to innovate swiftly, optimize operations, and achieve tangible business growth.”
PT HIJAU DIGITAL INTERNASIONAL
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An IT software firm offering a range of services, including: 1. Tailored ERP Software 2. Mobile App Development 3. Website Development 4. API Creation 5. User Interface/User Experience Design 6. Database Solutions 7. Project Management 8. Business Analytics 9. Big Data Solutions 10. Cloud Systems an
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Jakarta, Jawa, Id
Services Provided+6 Services
6% ERP & CRM Development
5% Mobile App Development (iOS & Android)
5% Custom Web Application Development
5% API Development & Integration
AI Summary
“PT HIJAU DIGITAL INTERNASIONAL is an Indonesia-based IT firm delivering tailored ERP, software development, UI/UX design, data analytics, cloud integration, and digital marketing solutions.”
Absolute IT
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Absolute IT is a team of technicians dedicated to providing more than just basic services; we aim to deliver reliable support you can depend on. Our guiding principle is that if we prioritize our clients, success will naturally follow. This approach has allowed us to maintain high client satisfactio
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Maroochydore, Queensland, Au
Services Provided+5 Services
4% Custom Web Application Development
4% API Development & Integration
27% Mobile App Development (iOS & Android)
8% Search Engine Optimization (SEO)
AI Summary
“Absolute IT delivers comprehensive managed IT support and business technology solutions, ensuring reliable performance and client-focused services for diverse enterprises over 13 years.”
Cuboid LLC
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Cuboid LLC is a software development company based in the U.S. that focuses on creating scalable web, mobile, and cloud platforms for startups and expanding businesses. Our team utilizes modern technology stacks such as ASP.NET Core, Angular, Flutter, and cloud infrastructure to deliver high-perform
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Kirkland, Washington, Us
Services Provided+11 Services
8% Custom Web Application Development
7% Mobile App Development (iOS & Android)
5% API Development & Integration
7% SaaS Product Development
AI Summary
“Cuboid LLC is a U.S.-based software development firm specializing in scalable web, mobile, and cloud platforms, delivering custom solutions and technology consulting for startups and enterprises.”
Virtual Think Technologies
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We create tailored, innovative, and cutting-edge mobile applications for top global brands, companies, startups, and organizations.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
8% E-Commerce Development
25% Mobile App Development (iOS & Android)
7% API Development & Integration
10% Custom Web Application Development
AI Summary
“Virtual Think Technologies specializes in developing innovative, customized mobile applications, serving global brands, startups, and organizations with advanced technological solutions.”
Ultima Milla Software
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A reliable and dedicated software development firm for innovative businesses and organizations focused on enhancing user experience.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
15% Custom Web Application Development
10% API Development & Integration
10% Backend Development
10% Frontend Development
AI Summary
“Ultima Milla Software is a dependable software development company specializing in creating innovative solutions that enhance user experiences for businesses and organizations.”
Netcraft Digital
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At Netcraft, we provide two unique services: 🚀 **Website As a Service (WaaS)**: Our innovative subscription model offers professionally crafted, custom websites starting at just €39/month, with no initial fees and all necessary monthly services included. - Custom-designed sites are delivered wit
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
30% Custom Web Application Development
15% E-Commerce Development
5% API Development & Integration
35% Web App UI Design
AI Summary
“Netcraft Digital offers custom websites via subscription and bespoke web solutions, combining AI-enhanced efficiency with personalized, white-glove service and 20 years of industry experience.”
Core Stack Solutions
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We are a software firm focused on creating dependable, scalable solutions that support business growth. Our team merges technical skills with a thorough understanding of our clients' requirements, offering everything from custom development to product design to deliver impactful software.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+5 Services
10% Custom Web Application Development
4% E-Commerce Development
8% API Development & Integration
3% Legacy System Modernization
AI Summary
“Core Stack Solutions delivers scalable, reliable software through custom development and product design, combining technical expertise with deep client understanding to drive business growth.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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