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

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Thorma Web LLC
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At Thorma Web, we focus on turning concepts into impactful, tailored software solutions that enhance business development.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
100% API Development & Integration
AI Summary
“Thorma Web LLC specializes in creating customized software solutions that drive business growth, transforming concepts into effective and tailored digital applications for diverse industries.”
Surepass Technologies
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Surepass Technologies provides real-time customer onboarding through its ID verification API. We offer a variety of APIs to businesses that assist in verifying customer identification documents such as PAN, Aadhaar, Driving License, Passport, and Voter ID.
Highlights
10-49
Employees
New Delhi, Delhi, In
Services Provided
85% API Development & Integration
15% Custom Web Application Development
AI Summary
“Surepass Technologies delivers real-time customer onboarding with APIs that verify various identification documents, enabling businesses to authenticate identities efficiently and securely.”
devatk11
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As a skilled Web API software developer, I focus on building robust and scalable web APIs, utilizing the powerful features of Microsoft Azure. With 20 years of experience in the industry, I have refined my abilities to design and implement APIs that are not only efficient but also secure and easily
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Alicante (Alacant), Valencia, Es
Services Provided
80% API Development & Integration
20% Custom Web Application Development
AI Summary
“Devatk11 is a seasoned Web API developer specializing in Microsoft Azure, delivering efficient, secure, and scalable API solutions to enhance performance and integration across systems.”
KLEAK DEVELOPMENT
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Route. Manage. Come back. We are the developers behind XFWD and Regular.io. We create robust backend tools that safeguard your traffic and secure your information. Our approach features streamlined code with optimal performance.
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
Services Provided
80% API Development & Integration
20% Mobile App Development (iOS & Android)
AI Summary
“KLEAK DEVELOPMENT develops robust backend tools like XFWD and Regular.io, focusing on secure traffic management, data protection, and streamlined, high-performance code solutions.”
Kemsys Technologies
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Kemsys Technologies is an IoT engineering firm that provides top-tier IoT hardware, software, and smart product development solutions. With a strong foundation of technical expertise and a passion for excellence, we are committed to ongoing technological innovation. Our exceptional end-to-end IoT de
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
250-999
Employees
Dallas, Texas, Us
Services Provided
70% API Development & Integration
30% QA & Software Testing
AI Summary
“Kemsys Technologies specializes in comprehensive IoT engineering, delivering innovative hardware, software, and smart product solutions with efficient, cost-effective development for diverse clients.”
Integration Glue
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We understand that effective and scalable integration hinges on comprehending your company's internal operations and methodologies. Integration Glue offers a comprehensive perspective of all your data and integrations, significantly enhancing your technical capabilities. Through modular integrations
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Auckland, Auckland, Nz
Services Provided
70% API Development & Integration
30% Custom Web Application Development
AI Summary
“Integration Glue specializes in delivering comprehensive, modular integration solutions that provide a holistic view of data and systems, enhancing operational efficiency and technology potential.”
Worklio
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Incorporate payroll into your platform to establish a reliable source of consistent revenue. Provide your clients with a service that helps them save time and minimize expensive mistakes. Utilizing our comprehensive API platform, you can design your own user interface and deliver a payroll solution
Highlights
$50,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Miami, Florida, Us
Services Provided
30% Custom Web Application Development
70% API Development & Integration
AI Summary
“Worklio offers an API platform enabling seamless payroll integration with features like Benefits, PEO, Time tracking, and Workers’ Compensation, enhancing efficiency and reducing errors for clients.”
Bountyy
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Identify weaknesses before they turn into threats. Security relies on proactive measures, not luck. Our thorough penetration testing reveals and addresses significant vulnerabilities before they can be taken advantage of by malicious actors. Using advanced techniques, we guarantee the safety of your
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Vantaa, Fi
Services Provided
70% API Development & Integration
30% Custom Web Application Development
AI Summary
“Bountyy specializes in proactive security through advanced penetration testing, identifying and addressing vulnerabilities to safeguard applications and APIs against potential threats.”
Cirronex
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Cirronex is an IT consulting company located in the UK, with a team of 11 to 50 employees, established in January 2025. They focus on providing customized solutions for platforms like Salesforce, ERP, MuleSoft, SAP S/4HANA, and ServiceNow. As a reliable digital partner, Cirronex assists organization
Highlights
10-49
Employees
High Wycombe, Greater London, Gb
Services Provided
70% API Development & Integration
30% Legacy System Modernization
AI Summary
“Cirronex is a UK-based IT consulting firm specializing in customized Salesforce, ERP, MuleSoft, SAP S/4HANA, and ServiceNow solutions to optimize workflows and support business growth.”
EDALITY
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Edality is a well-established professional developer of high-quality electronic boards and embedded software that has been operating in the global market for custom hardware solutions since 2003. The company produces innovative hardware and software solutions for clients worldwide, catering to secto
Highlights
10-49
Employees
Services Provided
30% Custom Web Application Development
70% API Development & Integration
AI Summary
“Edality specializes in high-quality electronic boards and embedded software, delivering innovative custom hardware solutions globally across telecom, healthcare, science, and industry with expert Signal Integrity analysis.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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