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

Index Of Solutions
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Index of Solutions is a dedicated ERP consultancy that specializes in providing Microsoft Dynamics 365 Business Central solutions throughout the Middle East, particularly in Lebanon and Saudi Arabia. We blend extensive technical knowledge with a solid grasp of business processes to execute complete
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
20% API Development & Integration
14% Custom Web Application Development
23% BI & Big Data Consulting & SI
10% ERP Consulting and SI
AI Summary
“Index of Solutions specializes in Microsoft Dynamics 365 Business Central ERP implementations across the Middle East, delivering customized, scalable solutions with integration, training, and ongoing support for diverse industries.”
Relu Consultancy
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Our advanced data scraping services utilize state-of-the-art technology to meet your needs. At Relu Consultancy, we aim to provide an adaptable scraping process that
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Bhopal, Madhya Pradesh, In
Services Provided+2 Services
33% Robotic Process Automation (RPA)
13% API Development & Integration
3% CMS Development & Customization
17% Custom Web Application Development
AI Summary
“Relu Consultancy specializes in advanced, secure data scraping solutions, providing adaptable and scalable services that effectively meet diverse business needs with cutting-edge technology.”
FlowSolutions d.o.o
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FlowSolutions d.o.o. is your ally in personalized software development. We are committed to supporting clients throughout the entire project, carefully tracking progress, adjusting to challenges, and making certain that each solution is designed for an outstanding user experience. From the initial c
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Zagreb, Grad Zagreb, Hr
Services Provided
45% Custom Web Application Development
25% Mobile App Development (iOS & Android)
20% API Development & Integration
10% QA & Software Testing
AI Summary
“FlowSolutions d.o.o. specializes in personalized software development, delivering scalable, functional, and user-focused solutions by closely managing projects from concept to completion.”
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devMab
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At devMab, we see ourselves as more than just an IT firm; we are pioneers in digital transformation. Driven by a passion for innovation and a dedication to quality, we deliver state-of-the-art solutions that effortlessly weave technology into the core of your business. Our expert team is committed t
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
Services Provided
40% Custom Web Application Development
25% Mobile App Development (iOS & Android)
25% API Development & Integration
10% E-Commerce Development
AI Summary
“devMab is a digital transformation leader delivering customized IT solutions and software development to enhance business operations and drive growth through innovative, client-focused strategies.”
Devsfield Software
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Devsfield is a software development firm that specializes in creating new software and enhancing existing systems. We concentrate on digital transformation, software engineering, AI-based solutions, and staff augmentation. **Service Model** We prioritize collaboration, transparency, and flexibilit
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Gaziemir, Izmir, Tr
Services Provided+2 Services
25% LLM Integration & Prompt Engineering
20% Custom AI Chatbot Development
5% IT Staff Augmentation
18% API Development & Integration
AI Summary
“Devsfield Software specializes in software development, digital transformation, AI solutions, and staff augmentation, delivering agile, collaborative, and cutting-edge technology services tailored to client needs.”
TSYFRA
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At Tsyfra, we focus on empowering businesses to succeed in the online space. Located in Chicago and catering to clients nationwide, we are a small yet committed web development agency dedicated to providing intelligent, scalable digital solutions without the costs associated with larger firms. We pr
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Palatine, Illinois, Us
Services Provided
13% API Development & Integration
25% E-Commerce Development
12% Mobile App Development (iOS & Android)
50% Search Engine Optimization (SEO)
AI Summary
“Tsyfra is a Chicago-based web development agency delivering personalized, scalable digital solutions nationwide, specializing in website creation, e-commerce, SEO, and digital marketing to support business growth.”
Healthcare Integrations
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Healthcare Integrations is a consulting and managed services firm focused on providing cutting-edge interoperability solutions for healthcare organizations. Utilizing technologies like Mirth Connect, HL7, and FHIR, we facilitate efficient data exchange and tackle system integration hurdles. OUR MISS
Highlights
$1,000+
Min Project Size
$150+/hr
Avg Hourly Rate
10-49
Employees
Kansas City, Missouri, Us
Services Provided+2 Services
13% Custom Web Application Development
20% API Development & Integration
23% Other IT Consulting and SI
10% IT Staff Augmentation
AI Summary
“Healthcare Integrations specializes in consulting and managed services, delivering reliable interoperability solutions using advanced technologies to optimize healthcare data exchange and enhance patient care.”
Tyetechnology
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Established with the goal of empowering small to medium-sized businesses, Tyetechnologies stands out as a leader in IT security and compliance. We take pride in our extensive expertise and dedication to delivering exceptional IT services. Our method integrates advanced technology with a personalized
Highlights
2-9
Employees
Charlotte, North Carolina, Us
Services Provided
14% Mobile App Development (iOS & Android)
20% API Development & Integration
33% Other IT Consulting and SI
33% Operational Process Consulting
AI Summary
“Tyetechnologies delivers comprehensive IT security and compliance solutions for small to medium businesses, specializing in cybersecurity, network support, software testing, and customized IT consulting services.”
Avrhil IT Services Private Limited
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We Create Software to Enhance Your Business. Avrhil IT Services Pvt Ltd is your reliable technology ally for Custom Software Development, Web Applications, E-Commerce Solutions, and Cloud Services. We assist startups, small and medium enterprises, and large companies in developing advanced digital s
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
20% API Development & Integration
35% Custom Web Application Development
25% Mobile App Development (iOS & Android)
20% E-Commerce Development
AI Summary
“Avrhil IT Services Pvt Ltd delivers custom software, web and mobile applications, e-commerce and cloud solutions, enabling businesses worldwide to automate, scale, and enhance digital growth.”
ProgStream
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ProgStream Pvt. Ltd. is an international software development firm with locations in Karachi, Pakistan, and Helsinki, Finland. For more than nine years, we have been assisting businesses in turning their concepts into effective digital solutions, including mobile and web applications, desktop softwa
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
20% API Development & Integration
40% Custom Web Application Development
40% Mobile App Development (iOS & Android)
AI Summary
“ProgStream Pvt. Ltd. is an international software firm specializing in Flutter and FlutterFlow development, delivering high-quality, cost-effective digital solutions, including mobile, web, and enterprise applications.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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