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

Interbits
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We are a Guadalajara-based company in Jalisco, Mexico, focusing on creating and developing websites, landing pages, online stores, custom software, and mobile applications for iOS and Android. We assist you in building your digital project tailored to the specific needs and demands of your business
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
18% Custom Web Application Development
18% Mobile App Development (iOS & Android)
5% API Development & Integration
10% E-Commerce Development
AI Summary
“Interbits is a Guadalajara-based company specializing in developing websites, e-commerce platforms, custom software, and mobile applications, delivering tailored digital solutions to meet diverse business needs.”
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SyedTech
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Full Stack Developer holding a Bachelor's degree in Software Engineering, with specialized skills in React.js, Next.js, and the MERN stack (MongoDB, Express.js, React.js, Node.js). Experienced in using PostgreSQL, Prisma, Drizzle ORM, and Tailwind CSS to create responsive and scalable web applicatio
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
Services Provided+3 Services
10% Custom Web Application Development
4% E-Commerce Development
8% API Development & Integration
7% Frontend Development
AI Summary
“SyedTech is a skilled full stack software developer specializing in React.js, Next.js, MERN stack, and modern tools, delivering efficient, scalable web applications with agile methodology expertise.”
NPCoding
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NPCoding, a leading technology innovator based in Ramat Gan, Israel, provides advanced solutions for web and mobile application development. Under the leadership of Noam Penn and Maya Lee Penn, our skilled team focuses on UX/UI design, eCommerce platforms, corporate websites, mobile apps, API develo
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+4 Services
18% Custom Web Application Development
12% E-Commerce Development
15% Mobile App Development (iOS & Android)
5% API Development & Integration
AI Summary
“NPCoding, based in Israel, specializes in web and mobile app development, UX/UI design, eCommerce, API integration, delivering customized digital solutions that enhance user engagement and brand growth.”
Viganium Software Company
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Viganium: Shaping the Future by Teaching Technology to Understand. We don't merely create a digital identity; we craft one that authentically represents you! At Viganium, we specialize in software solutions and Artificial Intelligence (AI) with a unique methodology. Our goal is not to replace humans
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+8 Services
8% Custom Web Application Development
6% Mobile App Development (iOS & Android)
6% SaaS Product Development
3% QA & Software Testing
AI Summary
“Viganium Software Company delivers tailored software, AI, and digital solutions across industries, enhancing productivity and supporting digital transformation with integrated services and innovative technology.”
Suryansh Raj Gupta
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I am currently working as a Full Stack Developer, with two years of experience, and I graduated in 2024 with a Bachelor of Technology (B.Tech) in Computer Science Engineering. My professional focus includes various areas such as Web Development and Hybrid Mobile App Development, along with participa
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Services Provided+3 Services
17% Custom Web Application Development
14% Mobile App Development (iOS & Android)
2% API Development & Integration
1% E-Commerce Development
AI Summary
“Suryansh Raj Gupta is a Full Stack Developer with expertise in web and hybrid app development, actively engaged in global freelance projects and keen to blend technology with business development.”
The Grey Parrots
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The Grey Parrots is recognized as one of the ideal allies for those seeking an intelligent partner in a web development and marketing firm. Our expertise lies in internet marketing, web development, social media marketing, graphic design, e-commerce, WooCommerce, and e-learning development. We have
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+6 Services
10% CMS Development & Customization
7% Frontend Development
5% Backend Development
8% E-Commerce Development
AI Summary
“The Grey Parrots delivers integrated web development, UI/UX design, and strategic digital marketing services, focusing on e-commerce and client-centric solutions to drive business growth and ROI.”
Nick Automations
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Nick Automations is an AI-driven agency that provides two main services: (1) developing custom SaaS products, which involves creating and launching complete software applications for clients, and (2) offering AI automation solutions such as workflow automation, chatbot creation, bespoke AI models, a
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+6 Services
8% AI Strategy & Roadmap Consulting
10% Custom AI Chatbot Development
5% Generative AI
10% Workflow Automation (Zapier / Make / n8n)
AI Summary
“Nick Automations is an AI-driven agency specializing in custom SaaS development and AI automation solutions, including workflow automation, chatbots, bespoke AI models, and consulting services.”
insuitlabs
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Insuitlabs is a subscription-based software development platform that focuses on three main areas: quality, speed, and cost-effectiveness. Unlike traditional outsourcing firms, we offer a user-friendly experience. You can start right away by signing up on our website, which grants you immediate acce
Highlights
Services Provided+6 Services
12% Custom Web Application Development
10% API Development & Integration
3% E-Commerce Development
8% Mobile App Development (iOS & Android)
AI Summary
“Insuitlabs provides a subscription-based software development platform emphasizing quality, speed, and cost efficiency with an intuitive interface, easy project management, and comprehensive lifecycle support including deployment and IP protection.”
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Infinity Genesis Solutions
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Infinity Genesis is an innovative software development company dedicated to making your ideas a reality. Our team of committed professionals utilizes advanced technology to create customized solutions that address your specific business requirements. By employing an agile methodology and a strong em
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+7 Services
10% Custom Web Application Development
6% Mobile App Development (iOS & Android)
5% API Development & Integration
3% E-Commerce Development
AI Summary
“Infinity Genesis Solutions is a software development company specializing in customized, innovative solutions using advanced technology and agile methodologies to deliver high-quality products efficiently.”
Facelift
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Facelift Design® is a premier agency in branding, design, digital, and creative marketing that was established in 2000. The agency focuses on various services including brand naming, creation, development, strategies, and protection, as well as innovative concepts in design, graphic design, web desi
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+10 Services
3% Packaging Design
4% Brand Guidelines Development
3% Infographic Design
5% Brand Identity Design
AI Summary
“Facelift Design® is a full-service creative agency offering branding, design, digital marketing, web development, e-commerce, and strategic solutions to enhance and protect your business identity.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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