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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WebRTC.ventures
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WebRTC.ventures is among the few software development firms globally that specializes in WebRTC and now also incorporates AI integration. Our commitment and expertise have earned the trust of numerous clients looking to realize their visions for real-time applications. We offer services to build, in
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Charlottesville, Virginia, Us
Services Provided
20% API Development & Integration
50% Custom Web Application Development
30% Mobile App Development (iOS & Android)
AI Summary
“WebRTC.ventures specializes in WebRTC and AI-integrated real-time application development, offering end-to-end services with a diverse remote team, serving clients globally since 2010.”
Ellicode
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### About Brainlab Studio Founded in 2013, Brainlab Studio is a software and web development firm that specializes in providing high-quality digital solutions for businesses across the UK, Europe, and beyond. We assist companies in scaling and expanding by creating robust, scalable, and secure web
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kyiv, Ua
Services Provided+1 Services
18% E-Commerce Development
17% Custom Web Application Development
10% API Development & Integration
5% ERP & CRM Development
AI Summary
“Ellicode, founded in 2013, delivers tailored, scalable software and web solutions including e-commerce, B2B web platforms, AI-driven analytics, and custom business systems across Europe and beyond.”
MetaProject
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👋 Hello! We focus on developing sophisticated CRM/EPR systems and SaaS solutions. Our main areas of expertise include: ✅ Logistics — both sea and land, with advanced route optimization, tracking, warehouse management, accounting, and more. ✅ Taxi and delivery services — involving roster management,
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Tallinn, Harju, Ee
Services Provided+3 Services
20% Custom Web Application Development
10% Mobile App Development (iOS & Android)
15% API Development & Integration
5% SaaS Product Development
AI Summary
“MetaProject specializes in developing custom CRM, ERP, and SaaS solutions with expertise in logistics, taxi, delivery, API integrations, payment systems, AI, and user-friendly interfaces across diverse industries.”
Digi2.agency
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Homes Sweet Leads: Your Real Estate's Digital Matchmaker Are you tired of silence on your website? At digi2.agency, we’re the friendly web experts dedicated to helping your real estate business thrive online. Imagine Webflow websites designed for conversions (without any coding hassles!), Google Ads
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Services Provided+2 Services
25% API Development & Integration
18% Web App UI Design
5% UX Research & Usability Testing
2% Product UX Strategy
AI Summary
“digi2.agency specializes in tailored Webflow web design, data-driven Google Ads, and analytics solutions to elevate real estate businesses' online presence and generate qualified leads effectively.”
SyntecX
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SyntecX specializes in telecommunications and enterprise ICT platforms and services. We have successfully completed numerous projects on both national and international scales for some of the largest companies across three continents. As a company dedicated to quality, we maintain a strong delivery
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Fredericton, New Brunswick, Ca
Services Provided
45% Mobile App Development (iOS & Android)
40% Custom Web Application Development
15% API Development & Integration
AI Summary
“SyntecX delivers advanced telecommunications and ICT solutions globally, specializing in digital innovation, network services, CRM systems, and data management for major enterprises and government entities.”
Firia
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Firia is a consultancy specializing in software and hardware design and development. Our team of engineers and project managers possesses extensive expertise in areas such as firmware development for embedded systems, PCB design, wireless communication protocols, and user interfaces for web, desktop
Highlights
10-49
Employees
Services Provided
35% Custom Web Application Development
25% API Development & Integration
25% Backend Development
15% Frontend Development
AI Summary
“Firia is a consultancy specializing in firmware, PCB design, wireless protocols, and software development across web, desktop, mobile, and backend systems, delivering comprehensive product solutions.”
Trikon.Tech
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Develop and Introduce Your MVP Without Restrictions We assist entrepreneurs and companies in transforming their ideas into tangible results more efficiently and intelligently through specialized no-code and AI solutions. Accelerate Your Market Entry: Our Efficient No-Code Method <
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% Custom Web Application Development
35% Mobile App Development (iOS & Android)
15% API Development & Integration
AI Summary
“Trikon.Tech empowers entrepreneurs and businesses to swiftly develop and launch MVPs using specialized no-code and AI solutions, enhancing efficiency and accelerating market entry.”
Stellar Development
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Stellar Development focuses on delivering customized software solutions across various sectors, helping businesses succeed in today's ever-changing environment. Our dedication to excellence remains strong as we continually adapt and expand our capabilities. In 2024, we started a transformative phase
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Skopje, Skopje, Mk
Services Provided+1 Services
35% Custom Web Application Development
15% API Development & Integration
25% Product UX Strategy
15% Wireframing & Prototyping
AI Summary
“Stellar Development delivers tailored software solutions across industries, combining technical expertise and business insight to drive innovation and support client success in evolving markets.”
Micora.NET Kft.
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Boutique .NET Web Development Company, founded in the early 2000s in Budapest, Hungary. We specialize in providing customized .NET solutions, with an emphasis on personalized web development and CMS projects tailored to each client's unique needs. Our commitment to quality and innovation leads to di
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Budapest, Budapest, Hu
Services Provided
25% Custom Web Application Development
13% API Development & Integration
12% E-Commerce Development
50% Web App UI Design
AI Summary
“Micora.NET Kft. is a Budapest-based boutique .NET web development firm delivering tailored CMS, e-commerce, and backend solutions with ongoing support and innovative, client-focused service.”
Razzbery Solutions
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Welcome to Razzbery, a proudly registered company in Jordan that specializes in converting your business ideas into vibrant digital solutions. Our experienced team in web and mobile development is committed to assisting you in building a solid online presence and reaching your business objectives.
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Amman, Amman, Jo
Services Provided
13% API Development & Integration
25% Custom Web Application Development
12% Mobile App Development (iOS & Android)
50% Search Engine Optimization (SEO)
AI Summary
“Razzbery Solutions, based in Jordan, specializes in transforming business ideas into dynamic digital solutions through expert web and mobile development, enhancing online presence and business success.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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