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

Ng Hub Innovative Solution
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We are a technology consulting firm dedicated to creating high-performance, scalable, and reliable software systems for contemporary businesses. Our extensive expertise encompasses backend engineering (using FastAPI and Node.js), frontend development (with Angular and React), and cloud services (par
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Services Provided+1 Services
20% Custom Web Application Development
30% API Development & Integration
5% E-Commerce Development
30% Backend Development
AI Summary
“Ng Hub Innovative Solution is a remote-first technology consulting firm specializing in scalable, high-performance software development, API optimization, and cloud-based enterprise solutions to meet diverse business needs.”
Osiya Tech
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OsiyaTech is a premier global IT organization that offers a comprehensive range of services and solutions in both current and emerging technologies. The company specializes in top-tier services for Software, Website and Mobile App Development, Web Design, API Integration, Outsourcing, Website Mainte
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Indore, Madhya Pradesh, In
Services Provided
30% Mobile App Development (iOS & Android)
30% Custom Web Application Development
25% API Development & Integration
15% CMS Development & Customization
AI Summary
“OsiyaTech is a global IT firm offering expert services in software, web, and mobile development, custom CMS solutions, API integration, and outsourcing with thorough client-focused analysis.”
Pressd
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I create tailored WordPress development solutions in Bristol for organizations seeking accessibility, AI automation, easier content management, and scalable performance. My approach is straightforward: I focus entirely on the goals of your business, your team, and its stakeholders. I strive to integ
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Bristol, England, Gb
Services Provided+4 Services
13% E-Commerce Development
20% API Development & Integration
20% Product UX Strategy
13% UX Research & Usability Testing
AI Summary
“Pressd offers tailored WordPress development in Bristol, focusing on accessibility, AI automation, and scalable performance to streamline content management aligned with business goals.”
Page Authority
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At Page Authority, we have a straightforward mission: to provide Development, SEO, and Custom Websites to businesses of all sizes. We believe every company, no matter its size, deserves the chance to flourish online. Check out our wide variety of services and see how we can support your success.
Highlights
10-49
Employees
Worcester, Massachusetts, Us
Services Provided+2 Services
3% Social Media Marketing
20% Search Engine Optimization (SEO)
2% Pay Per Click
25% Google Ads Management
AI Summary
“Page Authority offers comprehensive Development, SEO, and Custom Website services to businesses of all sizes, empowering them to grow and succeed in the online marketplace.”
Techmatrix Infotech
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Techmatrix Infotech is a leading IT outsourcing firm globally, specializing in the development of web applications, mobile applications, mobile games, e-commerce solutions, CMS websites, API integration, and comprehensive website design and development. Our goal is to fully meet our clients' needs b
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Surat, Gujarat, In
Services Provided
35% Custom Web Application Development
25% API Development & Integration
20% CMS Development & Customization
20% Frontend Development
AI Summary
“Techmatrix Infotech is a global IT outsourcing firm delivering high-quality web and mobile applications, e-commerce solutions, and customized development, focusing on innovative, scalable, and user-friendly software.”
AuroPro Soft Systems
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AuroPro is a prominent supplier of cloud and digital product engineering services in various sectors, including banking and financial services, healthcare, communications and media, and logistics. Based in Plainsboro, New Jersey, AuroPro supports clients in effectively managing their digital transfo
Highlights
250-999
Employees
Plainsboro Township, New Jersey, Us
Services Provided+1 Services
25% Mobile App Development (iOS & Android)
20% API Development & Integration
20% Cloud Consulting & SI
20% Software Development Services
AI Summary
“AuroPro Soft Systems excels in Software Development, delivering Mobile App Development, API Development, and Custom Software Development services that address client digital transformation needs effectively across various industries.”
Bytehouse
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Regardless of the industry, successful software isn't necessarily the largest or most intricate; rather, it's the solution that adapts swiftly and produces tangible results. Our iterative development methodology enables you to launch rapidly, scale with assurance, and invest in features that genuine
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% API Development & Integration
30% Custom Web Application Development
50% DevOps Engineering
AI Summary
“Bytehouse, based in Prishtina, Kosovo, delivers adaptable, scalable software solutions—including web, mobile, DevOps, cloud, and AI tools—through an iterative, outcome-focused development approach.”
Clydara
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Established in 2024, Clydara was created with the goal of connecting advanced AI technologies with real-world business needs. Our founders, who have expertise in software engineering and data science, recognized the opportunity for AI to revolutionize various industries. Initially a small group of e
Highlights
$1,000+
Min Project Size
$150+/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% API Development & Integration
30% Mobile App Development (iOS & Android)
50% AI Agent & Multi-Agent System Development
AI Summary
“Founded in 2024, Clydara delivers advanced AI-driven software solutions and specialized staffing services, supporting over 100 global companies to boost efficiency, growth, and innovation.”
Codino
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We are a team of dedicated and skilled developers located in Warsaw, ready to assist you in launching your product.
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Warszawa, Masovian, Pl
Services Provided
30% Custom Web Application Development
20% API Development & Integration
50% AI Strategy & Roadmap Consulting
AI Summary
“Codino is a Warsaw-based developer team offering skilled support and expertise to help businesses successfully launch their products with professional assistance.”
Jappware
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Since 2017, Jappware has been a dependable software development partner for clients around the globe. We recognize the challenges faced by modern tech CEOs and CTOs, such as navigating compliance and security requirements, overcoming the shortage of in-house expertise, and the pursuit of exceptional
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Lviv, Lviv, Ua
Services Provided+2 Services
20% Custom Web Application Development
10% Mobile App Development (iOS & Android)
15% API Development & Integration
5% QA & Software Testing
AI Summary
“Jappware, since 2017, offers certified software development, team augmentation, and secure custom solutions worldwide, addressing technical challenges to enhance business efficiency and long-term partnership.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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