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

Webhouse
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Webhouse is a Sydney-based custom software development firm. We specialize in creating tailored software, web applications, mobile apps, and business platforms, managing the entire process from initial scoping and discovery to design, development, integrations, and ongoing support. Our clients inclu
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Parramatta, New South Wales, Au
Services Provided+1 Services
30% Custom Web Application Development
25% Mobile App Development (iOS & Android)
20% API Development & Integration
15% Legacy System Modernization
AI Summary
“Webhouse, based in Sydney, delivers custom software, web and mobile applications, and business platforms for Australian SMEs, integrating advanced technologies and providing long-term development partnerships.”
Advay tech solutions
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We are a dedicated Laravel development team located in Pune, India, specializing in the creation and growth of edtech platforms that cater to hundreds of thousands of users. Our Background: For over six years, we have been the technical foundation of a prominent European competition platform that
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Pune, Maharashtra, In
Services Provided
50% Custom Web Application Development
25% API Development & Integration
10% Mobile App Development (iOS & Android)
15% QA & Software Testing
AI Summary
“Advay Tech Solutions is a Pune-based Laravel development team with 6+ years’ experience delivering scalable, secure edtech platforms supporting hundreds of thousands of users and complex multilingual compliance.”
SmartSwipe Corp
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Established in 2022 and based in New York City, Smart Swipe Corp began as a modest side venture fueled by a desire to enhance digital experiences. We have since evolved into a comprehensive SaaS studio, offering customized solutions for website development, app creation, and bespoke software integra
Highlights
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% API Development & Integration
35% Mobile App Development (iOS & Android)
35% Custom Web Application Development
AI Summary
“Smart Swipe Corp, founded in 2022 in NYC, delivers customized SaaS solutions, specializing in web and app development with iterative, transparent processes for global clients.”
Leanlabs Solutions, LLC.
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At Leanlabs, we provide customized IT solutions tailored to the specific requirements of various sectors. Whether you are involved in Retail, E-commerce, Tourism, Real Estate, SaaS, Healthcare, or Finance, we have specialized services designed to improve your business operations. **Retail:** Our s
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
40% Custom Web Application Development
20% Mobile App Development (iOS & Android)
25% API Development & Integration
15% E-Commerce Development
AI Summary
“Leanlabs Solutions, LLC. delivers tailored IT services and software across multiple sectors, enhancing operations, security, and customer experience through innovative, compliant, and scalable technology solutions.”
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Cloud Dog Consulting
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Cloud Dog specializes in software development, particularly in building strong and efficient Application Programming Interfaces (APIs). Our experienced team of developers is adept at creating customized software solutions that meet your specific business requirements. We harness our knowledge to des
Highlights
$100-149/hr
Avg Hourly Rate
2-9
Employees
Chesapeake, Virginia, Us
Services Provided
20% Custom Web Application Development
30% API Development & Integration
35% Other IT Consulting and SI
15% IT Staff Augmentation
AI Summary
“Cloud Dog Consulting specializes in custom software development, API design, cloud computing, IT strategy, network infrastructure, and cybersecurity to enhance clients' technology solutions.”
Cadmor Design
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Cadmor Design is a company located in Estonia, operating within the EU. It focuses on PCB hardware design, firmware, digital signal processing, and IT services, including backend, frontend, and AI/ML. We blend industrial-grade engineering with contemporary software methodologies to deliver dependabl
Highlights
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
30% API Development & Integration
30% Internet of Things Services
20% Backend Development
10% Cloud Consulting & SI
AI Summary
“Cadmor Design excels in API Development, delivering custom software solutions with a strong focus on backend and frontend services. Their expertise positions them well within Software Development's API Development & Integration sub-category.”
Intradev
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Intradev is a software development firm located in the UK that specializes in creating customized business systems. The company collaborates closely with organizations that depend on spreadsheets, manual processes, or outdated software, assisting them in moving towards structured, scalable solutions
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Hessle, England, Gb
Services Provided
70% Custom Web Application Development
10% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“Intradev is a UK software firm delivering tailored business systems that optimize operations by integrating workflows, enhancing efficiency, and supporting scalable growth through custom solutions.”
Duck Programs Inc
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Duck Programs Inc is a software development firm dedicated to creating practical, scalable solutions for growing enterprises. We excel in developing systems that automate tasks, connect platforms, and streamline intricate workflows. Our team crafts custom applications, internal business tools, integ
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Cedarhurst, New York, Us
Services Provided+1 Services
35% Custom Web Application Development
10% Mobile App Development (iOS & Android)
20% E-Commerce Development
25% API Development & Integration
AI Summary
“Duck Programs Inc develops customized software, SaaS platforms, and integrations to automate workflows, connect systems, and enhance efficiency for diverse business sectors including e-commerce and services.”
Spectrabyte Studio
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At Spectrabyte, we push the boundaries of design. Each of our creations is carefully crafted to ensure you’ll be captivated from the very first design—guaranteed. Our focus on clients means that every pixel, line of code, and strategic decision is in perfect harmony with your brand and audience, kee
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+5 Services
33% API Development & Integration
10% Product UX Strategy
7% Wireframing & Prototyping
7% UX Research & Usability Testing
AI Summary
“Spectrabyte Studio excels in innovative design, meticulously aligning each creative element with client brands to engage audiences effectively through every development phase.”
Onward Development
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We collaborate with healthcare organizations to address intricate operational and technological issues. Our focus is on optimizing workflows, enhancing data transparency, and updating internal systems to promote growth, efficiency, and adherence to regulations. By merging healthcare expertise with t
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Gainesville, Florida, Us
Services Provided
40% Custom Web Application Development
25% API Development & Integration
5% E-Commerce Development
30% Mobile App Development (iOS & Android)
AI Summary
“Onward Development partners with healthcare organizations to optimize operations and technology through tailored software, automation, and data transparency, enhancing efficiency, compliance, and informed leadership decisions.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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