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

bitsblast GmbH
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bitsblast GmbH is a software development firm located in Switzerland that focuses on Java and is an official partner of Magnolia CMS. We provide digital solutions aimed at improving your business's online visibility and effectiveness.
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Basel, Basel Stadt, Ch
Services Provided
20% API Development & Integration
30% Custom Web Application Development
50% DevOps Engineering
AI Summary
“bitsblast GmbH is a Swiss software development company specializing in Java and Magnolia CMS, delivering digital solutions to enhance online visibility and business effectiveness.”
iCareSofttech Solutions
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iiCareSoftware Solutions, a well-funded software development firm located in Luton, creates customized digital solutions such as web and mobile applications, as well as tailored software. Our dedication to substantial investment in technology and our team guarantees advanced, scalable products desig
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Luton, England, Gb
Services Provided
20% API Development & Integration
30% Mobile App Development (iOS & Android)
50% CRM Consulting and SI
AI Summary
“iCareSofttech Solutions develops customized web, mobile, and software applications with advanced technology and dedicated support to deliver scalable, tailored digital solutions for businesses.”
Pagepro
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What distinguishes us in the realm of technology agencies is our specialized expertise. We are an agency with a concentrated focus on Next.js, Expo, and Sanity, allowing us to thoroughly explore these technologies and remain at the cutting edge of industry trends and advancements. By selecting us, y
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Bialystok, Pl
Services Provided
50% Custom Web Application Development
30% Mobile App Development (iOS & Android)
15% API Development & Integration
5% E-Commerce Development
AI Summary
“Pagepro is a technology agency specializing in Next.js, Expo, and Sanity, delivering efficient, frictionless development processes focused on impactful business outcomes and innovation.”
Tharios
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Nous créons des logiciels personnalisés et des outils spécialisés pour les entreprises lassées des solutions SaaS inflexibles et inappropriées. Que ce soit pour des CRM internes, l'automatisation de processus, des plateformes web ou des outils de gestion, nous concevons des solutions simples, effica
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Versailles, Fr
Services Provided
45% Custom Web Application Development
15% Mobile App Development (iOS & Android)
25% API Development & Integration
15% E-Commerce Development
AI Summary
“Tharios develops customized, user-focused software solutions like CRMs and automation tools, emphasizing rapid, scalable delivery and ongoing support to meet diverse business needs effectively.”
Trilops, LLC
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We create advanced healthcare software that enables medical professionals to concentrate on what truly matters: providing improved patient care. At Trilops, our goal is to make healthcare technology more straightforward by developing solutions that are quick, secure, and tailored to the actual pract
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
35% Custom Web Application Development
10% Mobile App Development (iOS & Android)
20% API Development & Integration
20% Backend Development
AI Summary
“Trilops, LLC develops customizable, secure healthcare software—including EMR, telemedicine, and practice management systems—streamlining workflows and enhancing patient care through innovative, interoperable solutions.”
Pixelum
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Pixelum is a comprehensive consulting and software development agency that connects Small and Mid-Size Businesses (SMBs) with expert consultants who have successfully generated millions for companies across various sectors, along with top-tier talent from leading startups. Instead of merely offering
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Chicago, Illinois, Us
Services Provided+4 Services
10% AI Strategy & Roadmap Consulting
6% Custom AI Chatbot Development
6% Machine Learning Model Development
3% Computer Vision Solutions
AI Summary
“Pixelum is a consulting and software development agency delivering tailored solutions for SMBs, leveraging expert consultants to enhance business operations, drive revenue, and ensure long-term success.”
WaveZync
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At WaveZync, we transform concepts into cutting-edge solutions with both creativity and accuracy. Our skilled team develops customized strategies to address the unique requirements of each client, providing forward-thinking solutions and navigating you through the digital environment.
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Sheridan, Wyoming, Us
Services Provided+1 Services
20% Machine Learning Model Development
20% API Development & Integration
20% Software Development Services
20% Mobile App Development (iOS & Android)
AI Summary
“WaveZync excels in Software Development with expertise in Custom Web Application Development, API Development, and Mobile App Development (iOS & Android), crafting tailored digital solutions that address diverse client needs across industries.”
Cloudforgers Global PTE LTD
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Cloudforgers offers advanced technology consulting and GenAI-powered cloud-native development solutions to propel your business ahead. Our approach extends past mere development; we integrate cloud engineering, data strategy, and AI innovation to create scalable and intelligent systems that yield si
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
20% API Development & Integration
20% Custom Web Application Development
10% Mobile App Development (iOS & Android)
25% BI & Big Data Consulting & SI
AI Summary
“Cloudforgers Global PTE LTD specializes in advanced technology consulting, GenAI-powered cloud-native development, cloud engineering, data strategy, and AI innovation to build scalable, intelligent business solutions.”
Sysmo.pl - rozwiązania IT
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Who Are We? Sysmo is an expanding software company focused on providing high-quality IT solutions. We serve businesses of various sizes, individuals, and startups by offering extensive support for IT projects. Key Areas: - Mobile Applications: State-of-the-art apps for Android and iOS - Web Applica
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Poznan, Greater Poland, Pl
Services Provided
35% Mobile App Development (iOS & Android)
15% API Development & Integration
50% Web App UI Design
AI Summary
“Sysmo.pl delivers comprehensive IT solutions including mobile and web applications, custom software, and websites, supported by skilled professionals for businesses and startups globally.”
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Vuroom Technologies
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Vuroom Technologies is a Toronto-based company that offers website and custom software development, along with consulting services.
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Toronto, Ontario, Ca
Services Provided
30% API Development & Integration
50% Custom Web Application Development
20% Legacy System Modernization
AI Summary
“Vuroom Technologies, based in Toronto, specializes in website and custom software development, complemented by consulting services to support diverse business technology needs.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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