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

Devzonik
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DevZonik is a prominent agency specializing in Shopify development. Established in 2019, we have partnered with numerous thriving start-ups and companies worldwide. Our exemplary Shopify design practices are globally acknowledged, earning us several web design accolades. We offer a range of services
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Austin, Texas, Us
Services Provided
70% E-Commerce Development
15% API Development & Integration
15% Custom Web Application Development
AI Summary
“DevZonik is a global agency specializing in Shopify development and design, delivering tailored e-commerce solutions since 2019 to startups, SMEs, and large marketing firms.”
Daily Vision
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Daily Vision was established by engineers aiming to develop software that simplifies work rather than complicating it. From the outset, our mission has been to create innovative and efficient systems that integrate automation, AI, and customized development into useful business tools. We believe tec
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Gliwice, Silesian, Pl
Services Provided+1 Services
20% API Development & Integration
30% Custom Web Application Development
15% AI Strategy & Roadmap Consulting
25% Custom AI Chatbot Development
AI Summary
“Daily Vision develops innovative software integrating automation and AI, creating user-friendly, scalable business tools that streamline tasks and enhance productivity through intelligent solutions.”
Ordo Novus d.o.o.
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We create and provide personalized software solutions, such as SaaS platforms, operational tools, and data-focused applications that are customized for your business needs.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
45% Custom Web Application Development
30% API Development & Integration
10% Blockchain & Web3 Development
15% Mobile App Development (iOS & Android)
AI Summary
“Ordo Novus d.o.o. delivers personalized software solutions, including SaaS platforms and data-driven applications, tailored to meet diverse business operational needs effectively.”
Medical Systems Consult
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Medical Systems Consult is a specialized consulting firm focused on every facet of medical device development, encompassing regulatory compliance, software development, systems engineering, and risk management. We assist clients in navigating the journey from initial strategy to market launch, provi
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Dracut, Massachusetts, Us
Services Provided
45% Custom Web Application Development
15% Mobile App Development (iOS & Android)
25% API Development & Integration
15% QA & Software Testing
AI Summary
“Medical Systems Consult offers comprehensive consulting in medical device development, handling regulatory compliance, software, engineering, risk management, audits, and quality system improvements to support successful market entry.”
NS804
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NS804 is a comprehensive mobile app development company located in Richmond, VA. Focusing on native iOS and Android app development, NS804 has created over 100 applications since 2012. We maintain a humble approach, taking the time to understand your business, its direction, and your objectives. Dri
Highlights
$50,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Glen Allen, Virginia, Us
Services Provided
80% Mobile App Development (iOS & Android)
10% Custom Web Application Development
10% API Development & Integration
AI Summary
“NS804, based in Richmond, VA, specializes in native iOS and Android app development, delivering high-quality, collaborative, and innovative solutions tailored to diverse client needs since 2012.”
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Raihsoft Technologies
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Raihsoft is a software development company that specializes in creating scalable, high-performance applications with a focus on the user experience. We provide comprehensive solutions, from optimized databases to strong backends and user-friendly, modern frontends. Our main technologies include Pyth
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
45% Custom Web Application Development
10% Mobile App Development (iOS & Android)
30% API Development & Integration
15% E-Commerce Development
AI Summary
“Raihsoft Technologies develops scalable, high-performance software solutions with expertise in Python/Django and React, focusing on custom web applications, ERP systems, and integrated digital services tailored to business needs.”
Programi Tech
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Techbuilds develops intelligent, customized software and ERP systems that simplify life. We assist businesses in optimizing their operations and accelerating growth through personalized Odoo configurations and comprehensive full-stack development that meets their needs perfectly. Our objective is to
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Beirut, Lb
Services Provided+2 Services
25% API Development & Integration
5% E-Commerce Development
20% Mobile App Development (iOS & Android)
25% Product UX Strategy
AI Summary
“Programi Tech creates tailored software and ERP solutions, specializing in customized Odoo configurations and full-stack development to streamline business operations and drive growth efficiently.”
enovatika
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We are a digital agency driven by passion, expertise, and a sharp attention to detail. This allows us to provide efficient digital solutions and products that support businesses in scaling, adapting, and growing. Whether working with startups or small to medium-sized businesses, we strive to make a
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Timisoara, Timis, Ro
Services Provided+1 Services
20% API Development & Integration
30% Mobile App Development (iOS & Android)
20% Mobile App UI Design
20% Web App UI Design
AI Summary
“Enovatika is a digital agency specializing in efficient digital solutions and products that help startups and SMEs scale, adapt, and grow with expertise and attention to detail.”
Crea
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Crea is a comprehensive product development firm tailored for startups in the Bay Area. Our AI-driven engineering team is dedicated to empowering early-stage startups and fostering exceptional growth. Our commitment is straightforward: we turn your innovative concepts into high-quality products and
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
San Jose, California, Us
Services Provided
50% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“Crea is a Bay Area product development firm specializing in AI-driven, agile solutions for startups, offering comprehensive project management, feature expansion, and scalable technology support.”
Maestro Studio
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Since 2020, Maestro Studio has been dedicated to simplifying and enhancing access to technology. Our skilled team delivers practical and scalable solutions to bring your ideas to life. We create modern websites, high-performance e-commerce platforms, and mobile applications for both iOS and Android.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Tbilisi, Tbilisi, Ge
Services Provided
30% Custom Web Application Development
25% Mobile App Development (iOS & Android)
20% API Development & Integration
25% E-Commerce Development
AI Summary
“Maestro Studio delivers scalable digital solutions including websites, e-commerce, mobile apps, CRM, SEO, and API integration, prioritizing user experience, mentorship, and sustainable business growth since 2020.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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