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

Cerena Solutions
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Cerena Solutions focuses on MuleSoft integration and API-driven connectivity architecture. We provide certified experts who deliver affordable, scalable, and sustainable solutions for organizations of any size. Our offerings encompass MuleSoft architecture, API design, development, upgrades, and Dev
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Tacloban City, Eastern Visayas, Ph
Services Provided+1 Services
28% API Development & Integration
5% Custom Web Application Development
17% Other IT Consulting and SI
17% IT Staff Augmentation
AI Summary
“Cerena Solutions specializes in scalable MuleSoft integration and API-driven architectures, offering expert design, development, upgrades, and DevOps to optimize system connectivity and performance.”
Kleinberg Consulting
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At Kleinberg Consulting, our ten years of experience distinguish us in providing outstanding business solutions. Our team, located throughout the US and Canada, consists of proficient developers and CRM specialists who are adept at creating customized strategies for CRM implementation and marketing
Highlights
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided
34% CRM Consulting and SI
33% API Development & Integration
33% Digital Strategy
AI Summary
“Kleinberg Consulting offers tailored CRM and marketing automation solutions across industries, leveraging a decade of expertise to enhance efficiency and deliver measurable business growth.”
Tech Diligents Software solutions
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REACT JS | NODE JS | WORDPRESS | PHP | CODEIGNITER | LARAVEL | SHOPIFY | PAYMENT GATEWAY | API INTEGRATION | MYSQL | BOOTSTRAP | AJAX | HTML | YII | LARAVEL | ANGULARJS | MONGODB | NODEJS | PSD TO HTML | LOGO DESIGN | PHONEGAP | ANDROID | IPHONE | WEB SERVICES | JAVASCRIPT | OPENCART | JOOMLA | DRUP
Highlights
2-9
Employees
Indore, Madhya Pradesh, In
Services Provided+1 Services
25% API Development & Integration
30% Custom Web Application Development
20% Mobile App Development (iOS & Android)
15% E-Commerce Development
AI Summary
“Tech Diligents Software Solutions specializes in diverse web and mobile development technologies, including React, Node.js, PHP frameworks, e-commerce, blockchain, and API integrations for comprehensive digital solutions.”
Business Logic IT Services
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Business Logic IT delivers dependable and affordable IT solutions for organizations. Our services range from network installations and Microsoft 365 implementation to VoIP phone systems, security camera setup, and managed IT support. We are dedicated to assisting businesses in maintaining security,
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
20% Managed IT Services
5% Cloud Infrastructure Setup (AWS / GCP / Azure)
9% Network Architecture & Configuration
33% Cloud Consulting & SI
AI Summary
“Business Logic IT Services provides reliable, cost-effective IT solutions including network setup, Microsoft 365 deployment, VoIP, security cameras, and managed support to enhance business security and efficiency.”
Orbosis Global Pvt ltd
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Orbosis Global Pvt. Ltd. is an innovative IT services and consulting firm that provides comprehensive digital solutions for businesses across various sectors globally. Recognized as a rising startup, Orbosis merges extensive technical knowledge with a strong dedication to quality, innovation, and cu
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Services Provided+1 Services
14% Other IT Consulting and SI
7% IT Staff Augmentation
13% AI Strategy & Roadmap Consulting
33% Blockchain Marketing
AI Summary
“Orbosis Global Pvt. Ltd. delivers innovative IT solutions including app development, AI, cybersecurity, and digital marketing, enabling scalable, secure, and efficient digital environments for diverse businesses worldwide.”
Eco-Soft Economic Software GmbH
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Über uns Eco-Soft ist ein Schweizer Softwareunternehmen, das sich auf die Entwicklung von mobilen Apps spezialisiert hat. Wir bieten durchdachte, nachhaltige und technisch fortschrittliche Lösungen für Unternehmen jeder Größe. Seit über 20 Jahren entwickeln wir maßgeschneiderte Anwendungen, die Gesc
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
70% Mobile App Development (iOS & Android)
20% API Development & Integration
10% QA & Software Testing
AI Summary
“Eco-Soft Economic Software GmbH, a Swiss company, specializes in developing sustainable, high-quality mobile apps for iOS and Android, delivering tailored digital solutions with agile methods and reliable support.”
Benedict Wallis - Web Developer
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I am a freelance full-stack web developer with more than 16 years of experience in the field. I provide web development, consulting, and technical mentoring services to businesses of various sizes, including start-ups, agencies, designers, and fellow freelancers. My expertise lies in creating intric
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Bristol, England, Gb
Services Provided
50% Custom Web Application Development
25% E-Commerce Development
25% API Development & Integration
AI Summary
“Benedict Wallis is a freelance full-stack web developer with 16+ years experience, specializing in custom web solutions, consulting, mentoring, and advanced WordPress and e-commerce development.”
MoreBytes
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The finest code often emerges from the most unexpected sources and moments. Allow us to assist you in transforming your ideas into reality with code that will make your projects shine.
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Mount Pleasant, South Carolina, Us
Services Provided
40% Custom Web Application Development
30% API Development & Integration
15% E-Commerce Development
15% QA & Software Testing
AI Summary
“MoreBytes specializes in turning innovative ideas into exceptional software solutions, delivering high-quality code to enhance and realize diverse project goals across industries.”
RD Research Ltd
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We are a group of skilled software developers, recognized by small and medium-sized enterprises as well as national organizations like the NHS. Our team consists of top-notch developers in the UK who possess a genuine grasp of the technology, rather than merely depending on AI and quick fixes. We th
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Norwich, England, Gb
Services Provided
40% Custom Web Application Development
15% E-Commerce Development
30% API Development & Integration
15% Mobile App Development (iOS & Android)
AI Summary
“RD Research Ltd. is a UK-based software development team esteemed by SMEs and NHS, delivering deeply understood, meticulously crafted code ensuring robust, integrated technological solutions.”
ARG Systems
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ARG Systems specializes in creating tailored, lightweight web portals and automated quoting tools designed to simplify manual processes for small and medium-sized enterprises in the UK. Located in Towcester, the company aims to develop custom internal systems that enhance employee adoption and elimi
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
Northampton, England, Gb
Services Provided
75% Custom Web Application Development
25% API Development & Integration
AI Summary
“ARG Systems develops customized, lightweight web portals and automated quoting tools for UK SMEs, streamlining workflows and replacing unreliable spreadsheets with centralized systems.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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