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

Ratech
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Ratech | AI Development & Automation Agency Ratech is a comprehensive development agency that specializes in AI automation solutions, assisting small and medium-sized businesses (SMBs) in reducing operational costs by 40-60% and achieving efficient scaling. **Key Highlights** - **Specialization:**
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kyiv, Ua
Services Provided+2 Services
10% AI Strategy & Roadmap Consulting
15% Custom AI Chatbot Development
18% Machine Learning Model Development
7% Workflow Automation (Zapier / Make / n8n)
AI Summary
“Ratech is a development agency specializing in AI automation for SMBs, delivering custom end-to-end solutions that improve operational efficiency, reduce costs by 40-60%, and ensure scalable growth.”
Oblongata Limited
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Oblongata focuses on providing software development services specifically designed for startups in the pre-seed to Series A funding stages. We convert visionary concepts into scalable, high-performance software solutions that promote business growth and achieve market success. Understanding the dist
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Newington, England, Gb
Services Provided+1 Services
20% API Development & Integration
35% Custom Web Application Development
20% Mobile App Development (iOS & Android)
10% E-Commerce Development
AI Summary
“Oblongata Limited delivers tailored software development services for early-stage startups, employing agile methodologies and advanced technologies to create scalable, high-performance solutions that drive business growth.”
Saucal
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🚀 Unlock Your Store's Potential with WooCommerce Professionals Trusted by Amazon, Facebook, and More At Saucal, we assist eCommerce businesses in creating tailored stores, managing essential integrations, and enhancing performance. We've collaborated with global leaders like Amazon, Automattic, an
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Calgary, Alberta, Ca
Services Provided
40% E-Commerce Development
10% API Development & Integration
50% Customer Support Outsourcing
AI Summary
“Saucal delivers comprehensive WooCommerce eCommerce solutions including custom development, integrations, support, and hosting, trusted by industry leaders like Amazon and Facebook for scalable store success.”
Artol Web Studio
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At Artol Web Studio, we focus on delivering professional, affordable, and easy-to-manage websites tailored for startups and small businesses. Our goal is straightforward: to assist growing companies in swiftly establishing a strong online presence without the common stress, confusion, and excessive
Highlights
$1,000+
Min Project Size
2-9
Employees
Yardley, Pennsylvania, Us
Services Provided
10% API Development & Integration
40% Custom Web Application Development
50% Search Engine Optimization (SEO)
AI Summary
“Artol Web Studio delivers affordable, professional websites tailored for startups and small businesses, emphasizing efficiency, customization, SEO optimization, and user-friendly management to foster strong online presence.”
Techufy Inc
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Techufy boasts over 15 years of extensive experience and expertise in the design and development of complex, high-availability systems. We are committed to providing innovative solutions customized to meet your business requirements. We offer the following development services across various domain
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Bellevue, Washington, Us
Services Provided
25% Custom Web Application Development
18% API Development & Integration
7% Legacy System Modernization
50% Product Design
AI Summary
“Techufy Inc. specializes in designing and developing high-availability, scalable, and customized enterprise and IoT systems with agile methodologies, ensuring integration, quality, and ongoing support.”
Tavant
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Tavant is a prominent provider of AI-driven Fintech solutions, focusing on creating AI-enhanced digital products and specialized services that transform customer experiences. With extensive experience in fintech lending, automated financial services, AI-driven HELOC automation, AI Loan Officer funct
Highlights
$25,000+
Min Project Size
1000-9999
Employees
Santa Clara, California, Us
Services Provided+2 Services
13% AI Strategy & Roadmap Consulting
5% Custom AI Chatbot Development
20% Machine Learning Model Development
12% AI-Powered Document Processing
AI Summary
“Tavant delivers AI-powered fintech and digital solutions, specializing in mortgage automation, loan processing, and IT modernization, enabling businesses across industries to innovate and scale efficiently.”
Garnet Development Co. Ltd
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With over a decade of experience in mobile app development, we boast a highly skilled professional team, extensive expertise, an agile methodology, a robust quality control system, and a commitment to delivering results and providing an outstanding client experience, along with warranties and suppor
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Services Provided
60% Mobile App Development (iOS & Android)
25% Custom Web Application Development
15% API Development & Integration
AI Summary
“Garnet Development Co. Ltd. specializes in mobile app development with expertise in Kotlin Multiplatform, BLE technology, and diverse sectors, delivering innovative, quality projects on time.”
Oronts
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We are Oronts, an AI and software engineering firm located in Munich, specializing in the development of functional systems for production use. We create and implement backend platforms, cloud infrastructures, and AI-driven solutions where stability, structure, and scalability are essential. Our pro
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Munich, Bavaria, De
Services Provided+4 Services
20% API Development & Integration
13% Backend Development
17% Machine Learning Model Development
3% Conversational AI & Voice Assistant Development
AI Summary
“Oronts is a Munich-based AI and software engineering firm specializing in scalable backend systems, cloud infrastructure, and AI-driven solutions focused on stability, architecture, and maintainability.”
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DXFactor
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DXFactor accelerates digital transformation. Our team consists of seasoned entrepreneurs and operators with extensive expertise in technology and business implementations in sectors such as Health, Wellness & Fitness, Financial Services, Supply Chain, Startups, and more. From strategy development to
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
McLean, Virginia, Us
Services Provided+1 Services
25% API Development & Integration
30% Backend Development
20% Frontend Development
15% Mobile App Development (iOS & Android)
AI Summary
“DXFactor drives comprehensive digital transformation across diverse industries by delivering strategic, actionable solutions that enable business innovation, operational excellence, and market leadership.”
PyOps Tech Solutions LLP
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PyOps Tech Solutions is a company specializing in IT Services and IT Consulting, focused on assisting businesses in enhancing their digital presence through innovative, scalable, and high-performance products. We are dedicated to quality and customer-oriented service, creating solutions that enable
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Bengaluru, Karnataka, In
Services Provided+1 Services
19% API Development & Integration
15% Custom Web Application Development
33% Cloud Consulting & SI
25% DevOps Engineering
AI Summary
“PyOps Tech Solutions LLP delivers innovative IT services and consulting, offering scalable web, mobile, and custom software solutions to enhance digital growth for diverse businesses.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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