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

Shahid Web Expert
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Our agency is headed by Shahid Bashira, a full stack developer with over six years of experience in custom web development. We are dedicated to creating websites and applications that genuinely benefit businesses and have a meaningful impact. Utilizing modern tools such as the MERN stack and Laravel
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
70% Custom Web Application Development
30% API Development & Integration
AI Summary
“Shahid Web Expert, led by Shahid Bashira, specializes in developing scalable, high-performance web applications using modern technologies like the MERN stack and Laravel to drive business impact.”
Branch42
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Transforming concepts in SaaS to create enduring products that outlast the British Empire. Achieving innovation through consistency.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Mumbai, Maharashtra, In
Services Provided
70% Custom Web Application Development
30% API Development & Integration
AI Summary
“Branch42 specializes in innovative SaaS solutions, focusing on consistent development of enduring products that combine transformative concepts with lasting impact and reliability.”
TheGenieLab
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At TheGenieLab, we create, develop, and enhance Shopify stores that drive sales. As a Shopify Plus Expert Partner with a five-star client rating, we assist brands in transforming their digital storefronts into scalable, high-converting sales machines. Our skilled team, comprising developers, UX/UI d
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Coral Gables, Florida, Us
Services Provided
45% E-Commerce Development
20% Custom Web Application Development
25% API Development & Integration
10% SaaS Product Development
AI Summary
“TheGenieLab specializes in creating and enhancing Shopify Plus stores with custom development, migrations, and integrations, delivering scalable, high-converting eCommerce solutions for global clients.”
NeoQuant
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NeoQuant is a tech-focused company that utilizes data science and artificial intelligence to create solutions for quantitative finance and algorithmic trading. We develop sophisticated analytics and trading platforms designed to assist institutional and professional investors in refining their strat
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% API Development & Integration
70% Custom Web Application Development
AI Summary
“NeoQuant leverages data science and AI to develop advanced analytics and trading platforms, empowering institutional investors with enhanced strategies, risk management, and market insights.”
INCUBO ASESORAS INTEGRALES SAS
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For over a decade, Incubo Asesorías has been the preferred partner for reliable Ruby on Rails and Vue.js development. We focus on creating custom, ready-to-use software and proprietary ERP systems that require exceptional dependability. Having partnered with significant organizations like the Chambe
Highlights
2-9
Employees
Medellin, Antioquia, Co
Services Provided
60% Custom Web Application Development
30% API Development & Integration
10% E-Commerce Development
AI Summary
“Incubo Asesorías Integral SAS specializes in robust custom software, full-stack Ruby on Rails and Vue.js development, delivering scalable ERP and health system solutions for diverse industries and organizations.”
Treblum
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At Treblum, we create tailored industrial software specifically designed for your operations. We develop customized systems for industries such as manufacturing, warehousing, logistics, healthcare, pharmacy, textiles, maquiladoras, and distribution across Mexico. Our solutions provide complete trace
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Gomez Palacio, Durango, Mx
Services Provided
60% Custom Web Application Development
25% API Development & Integration
15% Backend Development
AI Summary
“Treblum delivers tailored industrial software solutions across multiple sectors in Mexico, integrating seamlessly with existing systems and hardware to optimize operations with ongoing support and compliance.”
Hexion-IT
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At Hexion-It, we support startups, businesses, and enterprises in turning their concepts into scalable digital products. Our expertise lies in Web and Mobile App Development, API Integration, Backend and CMS Solutions, MVP Development, Custom Software, and QA Testing. We take an innovative, client-c
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Gurugram, Haryana, In
Services Provided
30% Custom Web Application Development
30% Mobile App Development (iOS & Android)
25% API Development & Integration
15% QA & Software Testing
AI Summary
“Hexion-It delivers scalable web and mobile solutions, custom software, and QA testing across diverse industries, emphasizing client-focused, agile development with robust, secure, and user-friendly outcomes.”
Hireadev
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Hireadev is a premier software consultancy located in Brisbane, Australia, focused on providing businesses with expert technical solutions. With specializations in backend development, system integrations, and strategic consulting, we work closely with clients throughout Australia to tackle intricat
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% API Development & Integration
10% Mobile App Development (iOS & Android)
50% Backend Development
10% Frontend Development
AI Summary
“Hireadev, a Brisbane-based software consultancy, delivers expert backend development, system integration, and strategic consulting, partnering with Australian clients to create scalable, reliable software solutions.”
S
Skeema
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Skeema is a plugin for Figma and a development tool that links UI design with API documentation. It associates each design element in Figma with a specific API endpoint, providing access only to the pertinent API documentation. This saves frontend developers from having to sift through countless Swa
Highlights
2-9
Employees
Services Provided+2 Services
40% API Development & Integration
10% Legacy System Modernization
13% AI Strategy & Roadmap Consulting
13% Custom AI Chatbot Development
AI Summary
“Skeema integrates UI design with API documentation via a Figma plugin, enhancing team collaboration, precision, and development speed through backend validation and API analysis tools.”
MVP Studio | Verticode
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Verticode is a Minimum Viable Product (MVP) studio that assists founders in rapidly transforming their ideas into fully functional products. We focus on creating high-quality MVPs that serve as real, scalable solutions rather than mere prototypes, aimed at achieving early traction. As an MVP studio,
Highlights
$5,000+
Min Project Size
10-49
Employees
London, England, Gb
Services Provided
50% Custom Web Application Development
30% API Development & Integration
20% Mobile App Development (iOS & Android)
AI Summary
“Verticode specializes in rapidly developing scalable minimum viable products, partnering with founders and startups to transform ideas into launch-ready solutions aligned with business goals.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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