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

PixiCode
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PixiCode is a digital agency located in Angoulême, France, that specializes in custom web, mobile, and backend development. We create and implement scalable, high-performance, and secure digital products, which range from websites and APIs to full mobile applications. Our mission is straightforward:
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Fr
Services Provided+1 Services
20% API Development & Integration
20% Software Development Services
20% DevOps Engineering
20% Mobile App Development (iOS & Android)
AI Summary
“PixiCode specializes in custom web, mobile, backend, and API development, delivering scalable and secure digital products. Their expertise in Flutter, .NET, Node.js, and web technologies highlights their fitting within Software Development categories.”
Coat Rack Web Services, LLC
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Numerous non-profit organizations squander tens of thousands of dollars on ineffective and flawed applications. Our established method enables you to create customized solutions, ensuring you avoid wasting valuable donor funds on non-functional systems. Are you prepared to enhance your technology so
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Cedar City, Utah, Us
Services Provided
20% API Development & Integration
50% Custom Web Application Development
10% E-Commerce Development
20% Mobile App Development (iOS & Android)
AI Summary
“Coat Rack Web Services, LLC specializes in developing customized technology solutions for non-profits, helping them optimize donor funds by avoiding ineffective application expenditures.”
YARSDESIGN
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Hi there! I'm Yaroslav, and I specialize in creating complete websites—from the initial concept and domain registration to a fully operational site that is modern, dependable, and effective. Here’s what I offer: - Development of landing pages, corporate sites, and online stores - Building website
Highlights
< $25/hr
Avg Hourly Rate
Services Provided
25% API Development & Integration
25% Brand Film & Corporate Video
25% Web App UI Design
25% Custom Web Application Development
AI Summary
“YARSDESIGN excels in Software Development by delivering custom web applications, API integrations, and e-commerce solutions, ensuring modern, functional, and reliable websites consistent with their service offerings.”
Bytech
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Beyond being just a software company, we are dedicated experts focused on achieving excellence. We specialize in the agile development of tailored software, providing personalized solutions that foster the growth of our clients. With our knowledge in artificial intelligence and consulting, we lead t
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Sao Paulo, Sao Paulo, Br
Services Provided
30% Mobile App Development (iOS & Android)
20% API Development & Integration
50% AI Strategy & Roadmap Consulting
AI Summary
“Bytech specializes in agile, tailored software development and AI consulting, delivering innovative, personalized solutions that drive client growth and shape the digital landscape with strategic expertise.”
QUIXILON TECHNOLOGIES PRIVATE LIMITED
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Our company is committed to creating, developing, and providing state-of-the-art enterprise software solutions that meet the needs of businesses, ensuring high standards of quality, efficiency, and customer satisfaction. **Our Goals:** - **Software Development & Solutions** We focus on designi
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
24% API Development & Integration
10% Mobile App Development (iOS & Android)
33% Web App UI Design
33% DevOps Engineering
AI Summary
“QUIXILON TECHNOLOGIES PRIVATE LIMITED delivers advanced enterprise software solutions, IT consultancy, training, and support, leveraging innovative technologies to optimize business processes and drive technological growth.”
OpenKit
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OpenKit specializes in creating artificial intelligence solutions that revolutionize businesses through innovative AI technologies. Our expertise covers custom Large Language Models (LLMs), intelligent AI agents, sophisticated Retrieval Augmented Generation (RAG) systems, and generative AI applicati
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
5% AI Strategy & Roadmap Consulting
13% LLM Integration & Prompt Engineering
10% Custom AI Chatbot Development
10% Machine Learning Model Development
AI Summary
“OpenKit delivers secure, scalable AI solutions including custom LLMs, intelligent agents, and RAG systems, integrating advanced technologies to enhance business processes and decision-making.”
Bluepes
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Bluepes assists mid-sized companies in addressing system integration challenges, eliminating manual data tasks, and resolving inconsistent reporting across different platforms. We create and implement integrations, API connections, and AWS-based data architectures to link CRM, ERP, finance, and anal
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+3 Services
10% Other IT Consulting and SI
25% BI & Big Data Consulting & SI
15% Cloud Consulting & SI
10% Custom Web Application Development
AI Summary
“Bluepes delivers integration and data solutions leveraging AWS and API technologies to optimize system performance, reporting accuracy, and scalability for mid-sized companies across diverse sectors.”
SW Development Services
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SW Development Services provides innovative digital marketing, web design, and web development solutions for businesses of all sizes. We enhance your online visibility with imaginative strategies.
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Cherry Valley, Illinois, Us
Services Provided
50% Custom Web Application Development
20% API Development & Integration
20% Mobile App Development (iOS & Android)
10% Search Engine Optimization (SEO)
AI Summary
“SW Development Services excels in Software Development, offering custom web application development, API development, and mobile app development, addressing diverse client needs with modern technologies and frameworks.”
Comtrade 360
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Looking for a software development consultancy that provides full-stack, scalable teams, tech-rich solutions, and opportunities for long-term partnerships? You’ve come to the right spot! Comtrade 360 is a software development firm that supports businesses of all sizes in navigating the constantly ch
Highlights
250-999
Employees
Boston, Massachusetts, Us
Services Provided+3 Services
23% API Development & Integration
10% Legacy System Modernization
8% Cloud Consulting & SI
12% AI Strategy & Roadmap Consulting
AI Summary
“Comtrade 360 is a versatile software development consultancy delivering tailored, scalable solutions with expertise in cybersecurity, cloud, AI, and analytics, serving diverse industries and global clients.”
Mogabyte Labs
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We are an engineering lab concentrated on developing products, particularly for early-stage startups and businesses looking to grow. We manage every phase of a startup's technical development, from the initial idea to a product ready for the market. Our holistic strategy guarantees a consistent and
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% API Development & Integration
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
10% Frontend Development
AI Summary
“Mogabyte Labs is an engineering lab specializing in end-to-end product development for startups, delivering MVPs and scalable solutions that align with business goals and user needs.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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