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

Synorix Lab
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Synorix Lab, yenilikçi teknolojilerle geleceği şekillendirmeyi amaçlayan, yapay zeka destekli çözümler üreten modern bir dijital platformdur. Kullanıcı odaklı yaklaşımıyla akıllı uygulamalar, otomasyon sistemleri ve veriye dayalı projeler geliştirerek bireyler ve işletmelerin dijital alanda daha güç
Highlights
Services Provided+1 Services
25% API Development & Integration
25% Product Design
18% Brand Identity Design
7% Logo Design
AI Summary
“Synorix Lab is a modern digital platform specializing in AI-driven applications, automation, and data projects to empower individuals and businesses in the evolving digital landscape.”
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IT BEASTS
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Unlock the benefits of customized solutions. We specialize in creating personalized software and applications that cater specifically to your requirements. Say goodbye to one-size-fits-all options and enjoy the benefits of technology designed just for you. Our flexible methods yield outstanding outc
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Lahore, Pk Punjab, Pk
Services Provided+3 Services
25% Software Development Services
25% Custom Web Application Development
20% API Development & Integration
10% Generative AI
AI Summary
“IT BEASTS excels in delivering customized software solutions, including web applications and APIs, alongside mobile app development and thorough application testing that address specific client needs with flexible and tailored approaches.”
Wirk (PTY) Ltd
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Wirk is a software development firm that focuses on industrial programming and custom software solutions for high-demand environments, with 29 years of experience in the field. Our teams are experts in creating reliable platforms, digitizing intricate workflows, and integrating real-world infrastruc
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided
25% Custom Web Application Development
18% API Development & Integration
7% Mobile App Development (iOS & Android)
50% Custom AI Chatbot Development
AI Summary
“Wirk (PTY) Ltd. specializes in industrial software development, delivering reliable, custom solutions that digitize complex workflows and integrate infrastructure with digital ecosystems globally for 29 years.”
CodersGrow
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We focus on creating top-notch Laravel and WordPress plugins, themes, and tailored web solutions that deliver results. Our skilled team is committed to developing, improving, and troubleshooting code to guarantee smooth performance, scalability, and security. Whether you require a robust web applica
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+5 Services
4% API Development & Integration
2% Mobile App Development (iOS & Android)
5% E-Commerce Development
24% Custom Web Application Development
AI Summary
“CodersGrow specializes in developing high-quality Laravel and WordPress plugins, themes, and custom web solutions focused on performance, scalability, and security for seamless digital experiences.”
Koden Labs
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KodenLabs is a software consulting firm with locations in Montreal (Canada) and Itajaí (Brazil), catering to clients worldwide. We specialize in creating high-quality software for both startups and large enterprises, offering services ranging from MVP development and legacy system upgrades to team e
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Pincourt, Quebec, Ca
Services Provided+1 Services
25% Custom Web Application Development
15% Mobile App Development (iOS & Android)
20% API Development & Integration
25% Backend Development
AI Summary
“KodenLabs is a global software consulting firm specializing in rapid, high-quality software solutions for startups and enterprises, leveraging experienced engineers and AI-enhanced processes.”
YARANDIN LLC
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Yarandin Inc. is a technology partner based in Eastern Europe that assists businesses in expanding by converting disorganized, manual processes into efficient digital ecosystems. We focus on custom platform development, process automation (RPA), API integrations, and AI solutions, which include Gene
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Tallinn, Harju, Ee
Services Provided+8 Services
13% API Development & Integration
10% Custom Web Application Development
3% E-Commerce Development
6% Generative AI
AI Summary
“Yarandin LLC is an Eastern European technology partner specializing in custom platforms, process automation, AI solutions, and integrations, driving operational clarity and growth for SMEs and startups.”
MCRO
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MCRO is a highly regarded and innovative software development company that serves a variety of market segments. We take pride in our strong company culture, which comprises talented engineers, UI/UX designers, DevOps specialists, project managers, product managers, and more. Our practical and effici
Highlights
$100,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Cluj-Napoca, Cluj, Ro
Services Provided+2 Services
15% API Development & Integration
18% Mobile App Development (iOS & Android)
18% Custom Web Application Development
17% Product UX Strategy
AI Summary
“MCRO is a leading software development firm specializing in custom web and mobile applications, UI/UX design, API development, and cloud infrastructure with a skilled multidisciplinary team.”
TechnoGems Inc.
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TechnoGems Inc. offers comprehensive mobile development solutions and is a leading firm in creating iPhone, Android, and web applications. Our Engineering and UX teams design engaging custom software on a daily basis, guided by client-centered strategies. With over a decade of experience in addressi
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Fairfax, Virginia, Us
Services Provided
40% Custom Web Application Development
45% Mobile App Development (iOS & Android)
15% API Development & Integration
AI Summary
“TechnoGems Inc. specializes in custom mobile and web software development, integrating innovation strategies, agile methodologies, and client-focused teams to deliver tailored technology solutions.”
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Softhood Technologies Limited
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Softhood Technologies is a leader in innovation and technology, transforming the digital world for businesses of all sizes. Their carefully designed software solutions integrate effortlessly with modern business settings, enabling companies to enhance operations, connect with customers, boost sales,
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
25% API Development & Integration
40% Custom Web Application Development
25% Mobile App Development (iOS & Android)
10% E-Commerce Development
AI Summary
“Softhood Technologies delivers innovative, scalable software solutions that enhance business operations, customer engagement, and adaptability, enabling companies to achieve optimal performance and measurable results.”
GeekOffice
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Whether you're an entrepreneur eager to realize your idea or a seasoned executive looking to transition to digital, you'll need technology specialists across various fields. These professionals should not only engage in meaningful discussions about your business vision but also deliver with the prec
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Pasadena, California, Us
Services Provided+3 Services
15% API Development & Integration
20% Custom Web Application Development
10% Mobile App Development (iOS & Android)
5% E-Commerce Development
AI Summary
“GeekOffice collaborates with businesses to deliver custom technology solutions, from product development to website revamps, emphasizing user-centric design, iterative innovation, and scalable DevOps support.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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