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

Codedox
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CodeDox is a software development firm located in the UK, focused on creating custom solutions that help businesses succeed. Our team offers specialized knowledge in web and mobile application development, enterprise software, e-commerce platforms, and IT consulting. With proficiency in technologies
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% API Development & Integration
10% E-Commerce Development
AI Summary
“Codedox is a UK-based software development company delivering custom web, mobile, and enterprise solutions with expertise in .NET, PHP, and modern frameworks, supporting diverse business needs.”
Hazur Inc.
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Hazur Inc. is a Canadian software development studio dedicated to assisting businesses, startups, nonprofits, and expanding organizations in creating contemporary digital products with clarity, care, and lasting reliability. We specialize in custom web development, mobile app development, admin dash
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% API Development & Integration
10% E-Commerce Development
AI Summary
“Hazur Inc. is a Canadian software studio specializing in custom web and mobile development using modern technologies, delivering scalable, user-friendly digital products with ongoing support for businesses and nonprofits.”
Squad-C GmbH
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Squad-C ist eine Softwareagentur mit Standorten in Köln und Hongkong. Unser Ansatz kombiniert die Vorteile deutscher Projektleitung mit der Flexibilität und Wirtschaftlichkeit der Offshore-Entwicklung auf eine einzigartige, hybride Weise.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Cologne, North Rhine Westphalia, De
Services Provided
15% API Development & Integration
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
50% Generative AI
AI Summary
“Squad-C GmbH is a software agency operating in Köln and Hongkong, offering hybrid solutions that integrate German project management excellence with flexible offshore development.”
Invowork
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Enabling Businesses with Integrated IT Services for Complete Stack Development, Both Manual and Automated Quality Assurance, and Web Development Solutions. We focus on providing smooth and scalable applications, guaranteeing top-notch quality through careful manual and automated testing methods. Our
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
New York, New York, Us
Services Provided
25% Custom Web Application Development
15% API Development & Integration
10% Mobile App Development (iOS & Android)
50% Generative AI
AI Summary
“Invowork delivers integrated IT services including full-stack development, manual and automated quality assurance, and web development, ensuring scalable, high-quality applications tailored to client needs.”
Arna Softech
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Arna Softech is an IT service provider based in India, recognized as a prominent company specializing in high-quality Software Development Services for clients globally. Founded in 2015 and headquartered in India, we have worked with over 40 clients, developed more than 50 applications, and employ o
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Indore, Madhya Pradesh, In
Services Provided
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
15% API Development & Integration
50% Digital Strategy
AI Summary
“Arna Softech is an Indian IT firm delivering high-quality software development globally, with expert teams offering tailored solutions, client-focused collaboration, and adaptable services for startups and organizations.”
BMS Services
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BMS Services develops tailored software to help your business save time and eliminate monotonous manual tasks. In just 14 days, you will receive a clickable demo specifically created to meet your requirements and adaptable for your company's growth. Find out how we can streamline your workflow, allo
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Zaltbommel, Nl
Services Provided
15% API Development & Integration
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
50% AI Strategy & Roadmap Consulting
AI Summary
“BMS Services specializes in customized software solutions that streamline workflows and eliminate repetitive tasks, delivering tailored, scalable demos in 14 days to enhance business efficiency.”
YepCode
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YepCode is an integrated platform designed to assist development teams in creating, executing, and monitoring intricate automation and data integrations while avoiding the repetitive tasks that hinder progress, such as custom authentication, deployments, and logging. By simply writing JavaScript cod
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Oleiros, Galicia, Es
Services Provided+1 Services
18% API Development & Integration
7% Custom Web Application Development
25% IT Staff Augmentation
25% Operational Process Consulting
AI Summary
“YepCode is a cloud-based platform enabling development teams to create, execute, and monitor custom automation and data integrations effortlessly using JavaScript, streamlining workflows without infrastructure management.”
Brandon Cross
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We specialize in software solutions tailored for businesses. Whether you need a new software application, an enhancement for your development team, or an upgrade for your outdated system, we’re here to assist. We are dedicated to boosting development team productivity to deliver high-quality softwar
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Lacey Green, England, Gb
Services Provided+1 Services
25% Custom Web Application Development
18% API Development & Integration
7% Legacy System Modernization
25% AI Strategy & Roadmap Consulting
AI Summary
“Brandon Cross delivers tailored software solutions and team enhancements, focusing on efficient, pragmatic development using TypeScript and Node.JS to boost productivity and scalability.”
Tatvamasi Labs
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Tatvamasi Labs is a certified Odoo Silver Partner providing comprehensive ERP services, including implementation, customization, data migration, system integration, and ongoing support for businesses across various sectors and locations. We collaborate with organizations facing genuine operational c
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
40% Custom Web Application Development
10% Mobile App Development (iOS & Android)
30% Legacy System Modernization
20% API Development & Integration
AI Summary
“Tatvamasi Labs is an Odoo Silver Partner offering end-to-end ERP solutions including implementation, customization, data migration, integration, and ongoing support for diverse businesses.”
Ateed Tech
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Ateed Tech is a custom software development firm that specializes in comprehensive digital solutions, such as web and mobile applications, enterprise systems, cloud infrastructure, and AI-based technologies. The company is committed to helping organizations thrive in a fast-changing digital environm
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Services Provided
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% API Development & Integration
10% Legacy System Modernization
AI Summary
“Ateed Tech delivers tailored software solutions including web, mobile, enterprise, cloud, and AI technologies, enhancing business efficiency and growth through client-focused collaboration and innovation.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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