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

Altai Solutions
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At Altai Solutions, we are committed to creating cutting-edge and adaptable digital solutions for businesses of any size. Our expertise lies in custom software development, AI-powered applications, cloud technology, and user-friendly experiences. We collaborate closely with our clients to grasp thei
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+8 Services
5% Mobile App Development (iOS & Android)
3% E-Commerce Development
5% API Development & Integration
8% Custom Web Application Development
AI Summary
“Altai Solutions specializes in custom software, AI applications, and cloud technologies, delivering flexible and reliable digital solutions tailored to help businesses succeed in a dynamic environment.”
Alpha Bytes
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Alpha Bytes is a top digital agency specializing in AI automation, call automation, web design, web development, UI/UX, and services for WordPress and Shopify. Let’s take your business to the next level.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
Services Provided+3 Services
25% AI Agent & Multi-Agent System Development
13% E-Commerce Development
5% API Development & Integration
7% Mobile App Development (iOS & Android)
AI Summary
“Alpha Bytes is a leading digital agency offering AI and call automation, web design, development, UI/UX, and WordPress and Shopify services to advance businesses.”
Expert Code Lab Private Limited
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The Expert Code Lab Private Limited – "Build The Future Together" – is a software development firm specializing in Web/CMS Development, UI/UX Design, Mobile App Development, Rest API Development, IoT, Artificial Intelligence, Chatbots, SEO & Digital Marketing, as well as various video services for C
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Noida, Uttar Pradesh, In
Services Provided+72 Services
1% Frontend Development
2% API Development & Integration
1% Custom Web Application Development
2% Mobile App Development (iOS & Android)
AI Summary
“Expert Code Lab Private Limited specializes in software development, including web, mobile, AI, IoT, and digital marketing, delivering efficient, high-quality technology solutions for strategic growth.”
Tomrom Softwares
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Tomrom Softwares is an innovative software development firm committed to aiding businesses in their growth through cutting-edge digital solutions. We excel in creating high-quality websites, custom software, and scalable technology platforms designed to address contemporary business needs. Our team
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+10 Services
6% API Development & Integration
12% Custom Web Application Development
2% ERP & CRM Development
6% UX Audit & Heuristic Evaluation
AI Summary
“Tomrom Softwares delivers innovative, scalable digital solutions including websites and custom software, partnering with businesses to transform objectives into reliable, high-performance technology products.”
App Maestros
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Welcome to AppMestros! We're thrilled to have you visit our profile. At AppMestros, we provide affordable and rapid mobile application design. As a top digital technology service provider and consultancy, we help clients develop and implement strategies for digital transformation. We create innovati
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Services Provided+16 Services
3% Legacy System Modernization
4% Backend Development
5% Custom Web Application Development
4% API Development & Integration
AI Summary
“App Maestros delivers innovative software, IT infrastructure, AI automation, and business consulting services, empowering diverse clients with scalable digital solutions and strategic transformation expertise.”
inbybob_
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We offer a robust and efficient solution for overseeing your custom software development and quality assurance projects globally.
Highlights
$100,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Buenos Aires, Ar
Services Provided+5 Services
12% Custom Web Application Development
4% E-Commerce Development
4% API Development & Integration
10% IT Staff Augmentation
AI Summary
“Inbybob_ delivers efficient global management solutions for custom software development and quality assurance projects, ensuring robust oversight and streamlined project execution across diverse markets.”
Appexpedition
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We are enthusiastic about developing mobile applications and websites. Our company is rapidly emerging as a leading app development firm, featuring a talented team of developers skilled in iOS, Android, Flutter, AI, and React. What sets us apart is our unique approach of providing monthly service pa
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Laguna Beach, California, Us
Services Provided+4 Services
20% Mobile App Development (iOS & Android)
10% Custom Web Application Development
8% Backend Development
8% Frontend Development
AI Summary
“Appexpedition specializes in mobile app and website development, leveraging AI and advanced technologies to serve small businesses, healthcare, and entrepreneurs with flexible service payments and maintenance.”
Lattice Innovations Private Limited
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Lattice Innovations is a design firm focused on transforming technological concepts into practical systems. Established in Delhi in September 2014, Lattice has created and developed over 50 technology solutions, with 12 of them successfully implemented in the field. The company's clientele spans Sou
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+3 Services
20% Custom Web Application Development
10% Mobile App Development (iOS & Android)
3% API Development & Integration
14% Mobile App UI Design
AI Summary
“Lattice Innovations, established in 2014, is a Delhi-based design firm developing practical technological solutions across healthcare and public health, collaborating globally with diverse clients from startups to global organizations.”
GreenCode Labs
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At Green Code Labs, we work diligently, program, and provide swift results—while maintaining high standards. We prioritize honesty and fairness. Let's create something remarkable together.
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+10 Services
7% Custom Web Application Development
5% API Development & Integration
5% E-Commerce Development
5% Mobile App Development (iOS & Android)
AI Summary
“GreenCode Labs delivers efficient programming solutions with a focus on quality, integrity, and collaboration, aiming to create innovative and reliable software products for diverse needs.”
Own Info Tech Pvt. Ltd.
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Own Info Tech is the leading source for high-quality Web and App Development services in India, dedicated to improving your digital presence. We utilize state-of-the-art technology and creative strategies to help your brand achieve and sustain a strong online identity. As a top IT startup, we focus
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+8 Services
10% Mobile App Development (iOS & Android)
5% API Development & Integration
8% Custom Web Application Development
3% E-Commerce Development
AI Summary
“Own Info Tech Pvt. Ltd. is a leading Indian IT startup specializing in high-quality web and app development, delivering customized digital solutions to enhance online presence and brand identity.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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