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

Automios Technologies Private Limited
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Automios Technologies provides innovative and scalable IT solutions driven by AI, data, and cloud technologies. We assist businesses in turning their concepts into impactful digital products by offering AI and ML development, ERP systems, IoT integration, custom software, as well as web and mobile a
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+12 Services
6% Custom Web Application Development
4% API Development & Integration
2% E-Commerce Development
4% Mobile App Development (iOS & Android)
AI Summary
“Automios Technologies delivers AI-driven IT solutions including AI/ML development, ERP, IoT, custom software, and digital marketing to empower businesses with intelligent digital products and future readiness.”
Website developers
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At Website Developers, we provide all-encompassing web design and development services aimed at helping businesses establish a strong online identity. Our talented team excels in crafting responsive, user-friendly websites that engage your audience and deliver quantifiable results. We focus on moder
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+6 Services
13% E-Commerce Development
5% API Development & Integration
10% Frontend Development
8% Backend Development
AI Summary
“Website Developers offers comprehensive web design and development services, delivering responsive, SEO-optimized websites, e-commerce, and digital marketing solutions to support diverse business growth.”
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Hashmark
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Hashmark - A Web Agency focuses on creating and expanding online presence for emerging brands. Our skilled team develops tailored websites that build trust, attract visitors, and turn them into devoted customers for small and expanding businesses.
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
25% Custom Web Application Development
20% Software Development Services
15% Web App UI Design
10% Conversion Rate Optimization (CRO)
AI Summary
“Hashmark is a web agency specializing in tailored website development to enhance online presence, build trust, and convert visitors into loyal customers for small and growing businesses.”
Codearies
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Welcome to Codearies – Connecting Digital Aspirations with Reality. Established in 2024, Codearies offers you access to innovative digital solutions. We transform your concepts into tangible outcomes through our proficiency in Blockchain, AI/ML, Metaverse, Web, Mobile App, and UI/UX Development. Our
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+6 Services
17% Blockchain & Web3 Development
14% Mobile App Development (iOS & Android)
3% API Development & Integration
15% Product UX Strategy
AI Summary
“Founded in 2024, Codearies delivers innovative digital solutions across Blockchain, AI/ML, Metaverse, Web, Mobile App, and UI/UX Development with customized, flexible methods.”
Flowbte
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At Flowbyte Solutions, we combine creativity and technology to create bold digital products that empower brands. Whether working with startups or large enterprises, we develop seamless user experiences, scalable technologies, and effective digital strategies. Our Services Include: 🎨 UI/UX Design —
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+6 Services
17% Custom Web Application Development
14% Mobile App Development (iOS & Android)
3% API Development & Integration
10% Product UX Strategy
AI Summary
“Flowbyte Solutions specializes in creative digital products, offering UI/UX design, full-stack and mobile app development, and custom software solutions for diverse businesses.”
Nadeemdev
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Nadeemdev is a founder-led studio specializing in the development of SaaS applications and automation, focusing on Bubble.io, no-code platforms, and AI-driven systems. We assist startups and growing companies in transforming their ideas into scalable, production-ready software more quickly and cost-
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
Services Provided+6 Services
14% SaaS Product Development
8% Custom Web Application Development
5% API Development & Integration
5% Backend Development
AI Summary
“Nadeemdev is a founder-led studio specializing in Bubble.io SaaS development, automation, AI integrations, and scalable solutions, helping startups rapidly build efficient, reliable, and maintainable platforms.”
Int+ Technology Ltd.
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Int+ is a prominent custom software development firm located in Lagos, Nigeria, with an additional office in Toronto, Canada, providing exceptional services to clients throughout Africa, North America, and Europe. We collaborate with startups and established companies to create scalable, secure, and
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+9 Services
8% Custom Web Application Development
3% Legacy System Modernization
3% E-Commerce Development
10% Mobile App Development (iOS & Android)
AI Summary
“Int+ Technology Ltd. is a Lagos and Toronto-based custom software development company delivering scalable, secure solutions across multiple industries, including fintech and logistics, with comprehensive services from design to DevOps.”
RootOps TTechnologies
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RootOps Technologies is a contemporary web development firm dedicated to creating high-performance websites, scalable web applications, and digital solutions for startups, businesses, and growing brands. Our expertise lies in custom website development, SaaS applications, responsive UI/UX design, fr
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+17 Services
5% Custom Web Application Development
4% SaaS Product Development
2% QA & Software Testing
1% E-Commerce Development
AI Summary
“RootOps Technologies specializes in developing scalable, high-performance web applications and custom digital solutions using modern technologies, delivering quality designs and reliable software for diverse business needs.”
wosag tech
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WOSAG is a comprehensive digital technology firm located in Calicut (Kozhikode), Kerala, India. Established with the goal of making technology accessible to all, WOSAG started as a small group of developers who were dedicated to ensuring that every business has the opportunity to utilize top-notch d
Highlights
2-9
Employees
Services Provided+7 Services
7% E-Commerce Development
11% Mobile App Development (iOS & Android)
5% API Development & Integration
10% Custom Web Application Development
AI Summary
“WOSAG is a Kerala-based digital technology firm committed to delivering accessible, high-quality digital solutions to businesses, fostering enhanced technological integration and growth.”
MTDev
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After accumulating over four years of experience in web and mobile app development, I have chosen to embark on a path as an entrepreneur. My aim is to collaborate closely with clients in order to identify optimal solutions and jointly create modern, efficient, and user-friendly websites and applicat
Highlights
< $25/hr
Avg Hourly Rate
Services Provided+8 Services
7% API Development & Integration
14% Custom Web Application Development
10% Mobile App Development (iOS & Android)
4% E-Commerce Development
AI Summary
“MTDev is an entrepreneurial firm specializing in developing modern, efficient, and user-friendly web and mobile applications through close collaboration with clients to deliver optimal solutions.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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