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

Three Grey Monkeys
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We are a team of qualified Microsoft experts with a combined experience of over 30 years. We offer the know-how that many consulting firms claim to have but often fail to provide. With a diverse skill set, we are equipped to address nearly any challenge. Our team excels in specific Microsoft technol
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
London, England, Gb
Services Provided
50% CRM Consulting and SI
20% API Development & Integration
30% Mobile App Development (iOS & Android)
AI Summary
“Three Grey Monkeys is a team of Microsoft experts offering bespoke solutions across Dynamics CRM, SharePoint, SQL Server, and mobile apps, emphasizing quality and customer collaboration.”
Beansoft LLP
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Beansoft LLP is a tech partner that focuses on mobile app development, scalable microservices, and AI-based solutions. We assist startups and large businesses in creating dependable, high-performance products, including Android and Flutter applications, Spring Boot microservices, OCR/AI pipelines, a
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Hyderabad, Telangana, In
Services Provided
20% API Development & Integration
30% Mobile App Development (iOS & Android)
50% IT Staff Augmentation
AI Summary
“Beansoft LLP specializes in mobile apps, scalable microservices, and AI solutions, supporting startups and enterprises with dependable, high-performance products and innovative technologies.”
NXON AI PVT. LTD.
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NXON is a top provider of IoT and custom embedded solutions and services, both internationally and in India. We are dedicated to offering excellent Embedded and IoT Product Engineering Services. Our focus is on maintaining the highest quality standards, incorporating security features, and approachi
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Ahmedabad, Gujarat, In
Services Provided
20% API Development & Integration
30% Custom Web Application Development
50% AI Strategy & Roadmap Consulting
AI Summary
“NXON AI PVT. LTD. specializes in high-quality IoT and embedded solutions, delivering secure, collaborative product engineering services worldwide with a strong focus on quality and customer satisfaction.”
Axio Electronics Pvt Ltd
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🚀 Axio Electronics focuses on complete product design and development, transforming your creative ideas into market-ready products. With our extensive knowledge, we provide strong and innovative solutions throughout every phase of product development. ✔︎ 100% Job Success | TOP RATED | Over 100 sati
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Jaipur, Rajasthan, In
Services Provided
30% Custom Web Application Development
20% API Development & Integration
50% Product Design
AI Summary
“Axio Electronics Pvt Ltd specializes in comprehensive product design and development, delivering innovative, market-ready solutions across various industries with proven expertise and top-rated service.”
SoftGeneral
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SoftGeneral is an outstaffing partner that assists tech companies by providing skilled and cohesive teams in Node.js, React.js, and Blockchain. We focus on staff augmentation and the creation of dedicated teams. With a pool of over 20 engineers, we place a strong emphasis on experienced developers,
Highlights
$75,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Odesa, Odesa, Ua
Services Provided
20% API Development & Integration
30% Blockchain & Web3 Development
50% IT Staff Augmentation
AI Summary
“SoftGeneral specializes in providing experienced Node.js, React.js, and Blockchain engineers through staff augmentation and dedicated teams, ensuring rapid, quality staffing for tech companies.”
WebIQ Services
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WebIQServices is a professional web development and digital solutions firm located in India. We focus on WordPress, Shopify, PHP development, WIX, API integrations, and tailored website solutions. Our mission is to provide affordable, high-quality, and scalable digital products for startups and expa
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Jalandhar, Punjab, In
Services Provided
30% Custom Web Application Development
20% API Development & Integration
50% Web App UI Design
AI Summary
“WebIQ Services is an India-based digital solutions provider specializing in web development, including WordPress, Shopify, PHP, and API integrations, delivering scalable, affordable products globally.”
Innofied Solutions
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Innofied: Empowering Businesses with 600+ Successful Projects and Over 13 Years of Tech Experience Innofied is an award-winning AI software development firm, boasting more than 600 successful projects since its inception in 2012. We specialize in assisting businesses, including Fortune 500 compani
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Kolkata, West Bengal, In
Services Provided+2 Services
30% Custom Web Application Development
20% API Development & Integration
15% AI Strategy & Roadmap Consulting
13% Custom AI Chatbot Development
AI Summary
“Innofied Solutions is an AI software development firm with 13+ years' experience, delivering customized AI and SaaS solutions to enhance operational efficiency and drive business growth.”
VelocityS3
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VelocityS3 is a U.S.-based software development agency that assists companies in launching and scaling digital products through two distinct approaches: VelocityS3 Serviced— which offers traditional web and SaaS development, Salesforce implementations, and enterprise integrations utilizing modern, s
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% API Development & Integration
40% Custom Web Application Development
10% Legacy System Modernization
20% Frontend Development
AI Summary
“VelocityS3 is a U.S.-based software agency delivering scalable digital products with traditional and AI-driven approaches, specializing in modern web, SaaS, Salesforce, and rapid MVP development.”
Nexus Level Advisor
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At Nexus Level Advisor, we focus on assisting businesses in scaling intelligently and running smoothly through strategic system design and personalized automation solutions. Based in Toronto, we take pride in helping companies enhance their operations, increase productivity, and tap into growth pote
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Toronto, Ontario, Ca
Services Provided
25% Robotic Process Automation (RPA)
25% API Development & Integration
25% Operational Process Consulting
25% DevOps Engineering
AI Summary
“Nexus Level Advisor delivers custom automation and strategic system design, enabling diverse businesses to optimize operations, boost productivity, and achieve sustainable growth efficiently.”
CybrillTech Inc
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Experience a new standard of web excellence with CybrillTech Inc., led by CEO Talha Javed. Our committed team provides creative web solutions that enhance your online presence. With elegant designs and smooth functionality, we push the boundaries of what the web can achieve. Join us to realize the f
Highlights
10-49
Employees
Services Provided
33% Machine Learning Model Development
29% API Development & Integration
5% QA & Software Testing
33% Graphic Design
AI Summary
“CybrillTech Inc., led by CEO Talha Javed, delivers comprehensive web solutions including design, secure payment integration, API development, hosting, digital marketing, and SEO services.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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