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

Velqum Corporation
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At Velqum Corporation, we focus on providing tailored software solutions that enable businesses to grow, innovate, and succeed in the digital age. Our knowledge includes SEO-optimized web applications, SaaS platforms, and enterprise-level application solutions crafted to address sophisticated busine
Highlights
2-9
Employees
Services Provided+4 Services
11% Custom Web Application Development
3% E-Commerce Development
2% Mobile App Development (iOS & Android)
5% API Development & Integration
AI Summary
“Velqum Corporation delivers tailored software solutions, including SEO-optimized web applications and enterprise SaaS platforms, enabling businesses to innovate and succeed in the digital age.”
Orbisys Technology
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Orbisys is a comprehensive technology agency focused on creating scalable digital products for startups, small to medium-sized enterprises, and large corporations. We specialize in complete product development, covering everything from validating ideas and designing architecture to UI/UX design, ful
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Noida, Uttar Pradesh, In
Services Provided+10 Services
8% Custom Web Application Development
7% Mobile App Development (iOS & Android)
5% API Development & Integration
5% E-Commerce Development
AI Summary
“Orbisys Technology is a full-service digital product agency delivering scalable, secure solutions from idea validation to cloud deployment, leveraging modern tech and 25+ years expertise for startups to enterprises.”
Autea
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Our software developers assist startups and digital agencies in creating outstanding, long-lasting software products based on JavaScript. Whether developing a Node.js backend, an Angular web application, or a cross-platform Ionic mobile app, we emphasize maintainability to help our clients maximize
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Gliwice, Silesian, Pl
Services Provided+3 Services
15% Custom Web Application Development
8% Mobile App Development (iOS & Android)
13% Backend Development
12% Frontend Development
AI Summary
“Autea specializes in developing maintainable JavaScript-based software, offering backend, web, and mobile solutions to startups, enterprises, and software firms focused on scalable, high-tech products.”
Cognimit Technologies LLP
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Cognimit Technologies LLP is a software engineering and technology consulting firm dedicated to creating scalable digital systems. We partner with startups, product teams, and expanding businesses to create robust software platforms that facilitate actual business processes and foster long-term prod
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Ahmedabad, Gujarat, In
Services Provided+12 Services
5% SaaS Product Development
3% Frontend Development
2% QA & Software Testing
3% Mobile App Development (iOS & Android)
AI Summary
“Cognimit Technologies LLP is an Ahmedabad-based software engineering firm specializing in scalable, maintainable digital platforms, offering end-to-end development and consulting for startups and expanding businesses globally.”
FLUGGI GROUP
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Fluggi Group — ваш надежный союзник в сфере цифровых технологий и бизнес-новшеств. Мы занимаемся разработкой и внедрением IT-решений, которые способствуют росту и развитию компаний разных размеров. Наша компания сочетает опыт в программной разработке, маркетинге, бизнес-консалтинге и автоматизации.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+12 Services
7% Custom Web Application Development
2% Mobile App Development (iOS & Android)
3% API Development & Integration
3% Backend Development
AI Summary
“Fluggi Group specializes in IT solutions, business consulting, marketing, and automation, enhancing operational efficiency and growth for diverse companies with expert software development and project management.”
29tech
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We are an enthusiastic team of innovators dedicated to empowering businesses to soar. Established in 2023, we offer a worldwide outlook and extensive experience for every endeavor. Our work goes beyond mere coding; we transform your ideas into impactful technological solutions that enhance your bran
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Services Provided+5 Services
10% Mobile App Development (iOS & Android)
5% Blockchain & Web3 Development
6% API Development & Integration
4% E-Commerce Development
AI Summary
“Founded in 2023, 29tech delivers innovative technological solutions worldwide, transforming ideas into impactful products that enhance brands and drive business success.”
Kiwop
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**About Us** Kiwop is a web development, growth marketing, and AI consultancy located in Reus, Spain, serving clients globally. We bring together experienced engineers, marketers, and analysts to create fast, secure, SEO-optimized websites and implement growth initiatives aimed at achieving specif
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+13 Services
13% Custom Web Application Development
9% E-Commerce Development
4% API Development & Integration
5% UX Research & Usability Testing
AI Summary
“Kiwop is a global web development and AI consultancy delivering SEO-optimized websites, e-commerce solutions, growth marketing, and data-driven strategies to boost business performance reliably and transparently.”
Altos Engineering
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We focus on creating and developing user-friendly websites, cutting-edge apps, and comprehensive software solutions customized to meet your specific business requirements.
Highlights
$50-99/hr
Avg Hourly Rate
2-9
Employees
Ee
Services Provided+10 Services
10% BI & Big Data Consulting & SI
10% Software Development Services
10% DevOps Engineering
10% Other IT Consulting and SI
AI Summary
“Altos Engineering specializes in developing user-friendly websites, innovative apps, and tailored software solutions designed to fulfill diverse business needs efficiently and effectively.”
Appstree
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Welcome to Appstree, where expert digital creation aligns with business insight. As a leading development collective, we focus on crafting exceptional native, cross-platform, and hybrid mobile applications, as well as advanced web/admin systems. Our technological expertise includes Flutter, Android,
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+6 Services
17% Mobile App Development (iOS & Android)
7% Custom Web Application Development
5% API Development & Integration
2% E-Commerce Development
AI Summary
“Appstree specializes in developing innovative native and cross-platform mobile apps and advanced web systems, delivering seamless digital experiences with robust support across global markets.”
MQ Solutions Corp
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MQ Solutions Corp (MQVL.com) is a forward-thinking digital agency specializing in web development, marketing, and AI solutions. For more than 20 years, we have assisted businesses in transforming their ideas into measurable outcomes through customized web development, AI-driven marketing, and softwa
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+9 Services
10% Custom Web Application Development
7% E-Commerce Development
5% Backend Development
5% Frontend Development
AI Summary
“MQ Solutions Corp offers comprehensive digital services, including custom web development, AI-driven marketing, SEO, and cloud integrations, empowering businesses with innovative, data-driven solutions for growth.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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