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

HT Technologies
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I am an experienced developer with five years in the field. During my career, I have effectively designed, implemented, and maintained software solutions that adhere to high standards of efficiency and quality. My skills include: • HTML, CSS, JavaScript, PHP Laravel, WordPress, React JS, Node JS, Ex
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
Services Provided
50% Custom Web Application Development
35% API Development & Integration
15% E-Commerce Development
AI Summary
“HT Technologies is a proficient software development company specializing in web technologies and graphic design, delivering efficient and high-quality solutions using modern frameworks and tools.”
Adtitude Digital
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At Adtitude Digital, we assist companies in transforming their data into practical insights by utilizing advanced analytics, data engineering, and cloud-based solutions. By merging technical know-how with a strategic mindset, we create scalable systems that enhance decision-making, boost operational
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Glenview, Illinois, Us
Services Provided
30% API Development & Integration
20% E-Commerce Development
50% BI & Big Data Consulting & SI
AI Summary
“Adtitude Digital specializes in leveraging advanced analytics, data engineering, and cloud solutions to deliver scalable systems that enhance decision-making, operational efficiency, and business growth.”
Corebit Systems
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Corebit Systems is a web systems company that prioritizes engineering, specializing in the design and delivery of scalable business websites and platforms. We collaborate with organizations for whom a website is integral to their business infrastructure, emphasizing aspects like performance, SEO, se
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Burgas, Bg
Services Provided
20% Custom Web Application Development
30% API Development & Integration
50% Operational Process Consulting
AI Summary
“Corebit Systems specializes in scalable, secure web platforms with strong performance and SEO, delivering API-driven architecture and headless systems for global clients, ensuring long-term maintenance.”
Indigo Logic LLC
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Indigo Logic is a software development firm that assists businesses in operating more effectively and efficiently with minimal effort by providing user-friendly custom software solutions.
Highlights
$50-99/hr
Avg Hourly Rate
2-9
Employees
Olathe, Kansas, Us
Services Provided
30% API Development & Integration
20% Mobile App Development (iOS & Android)
50% Cloud Consulting & SI
AI Summary
“Indigo Logic LLC specializes in delivering custom, user-friendly software solutions that enhance business efficiency and operational effectiveness through tailored technology development.”
uFlow Decision Engine
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The most adaptable, user-friendly, and rapid decision engine that is fully web-based, cloud-enabled, and requires no coding. Streamline and enhance the credit assessment process through automation.
Highlights
$5,000+
Min Project Size
10-49
Employees
Chicago, Illinois, Us
Services Provided+2 Services
4% Custom AI Chatbot Development
7% Cloud Consulting & SI
5% LLM Integration & Prompt Engineering
18% AI Strategy & Roadmap Consulting
AI Summary
“uFlow Decision Engine is a cloud-based, no-code platform that enables rapid, adaptable automation of decision-making processes, notably streamlining credit assessments through enhanced efficiency.”
Pylons Technology
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Since 2018, Pylons Technology Private Limited has established itself as a reliable partner for IT solutions and consulting, located in Durg, Chhattisgarh. The company focuses on providing innovative, scalable, and business-oriented technology services designed to empower organizations across various
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Khapri Alias Pipardih, Maharashtra, In
Services Provided+1 Services
33% API Development & Integration
14% IT Staff Augmentation
13% ERP Consulting and SI
7% Other IT Consulting and SI
AI Summary
“Pylons Technology delivers tailored IT solutions including ERP, software, and app development, supporting digital transformation across manufacturing, education, and industrial sectors since 2018.”
Placematic USA LLC
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We develop advanced, data-centric mapping applications that enable businesses to accelerate their operations, enhance their planning, and expand confidently. By leveraging state-of-the-art technologies, we provide scalable mapping solutions that assist companies in making quicker and more informed d
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Rolling Meadows, Illinois, Us
Services Provided
55% Custom Web Application Development
15% Mobile App Development (iOS & Android)
30% API Development & Integration
AI Summary
“Placematic USA LLC develops advanced, customizable mapping and location technology solutions, including geocoding and logistics optimization, empowering businesses to enhance planning, speed, and growth with spatial data.”
NORABYTE
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We create commercial websites, customer-oriented systems, and internal tools for businesses seeking improved efficiency and enhanced lead conversion. Our clients are companies in Mexico and the U.S. that prefer streamlined software solutions without unnecessary complexity.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Hermosillo, Sonora, Mx
Services Provided
80% Custom Web Application Development
20% API Development & Integration
AI Summary
“NORABYTE develops efficient commercial websites, customer-focused systems, and internal tools for Mexican and U.S. businesses aiming to optimize operations and enhance lead conversion.”
Webolicious
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At Webolicious, we create websites that are visually appealing and beneficial for your business. Located in Essex, our talented team specializes in crafting tailored websites that achieve results. Whether you require a unique website design, expert WordPress development, smooth API integration, or d
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
34% API Development & Integration
33% Product UX Strategy
33% Search Engine Optimization (SEO)
AI Summary
“Webolicious, based in Essex, offers expert website design, WordPress development, API integration, and reliable maintenance, delivering tailored digital solutions that enhance business success.”
Klug Infotech
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About Klug At Klug, we are dedicated to helping your business thrive and reach its goals. We specialize in creating adaptable and tailored systems as needed. Our focus is on building enduring relationships through our dedication, flexibility, and openness. Whether you are an emerging startup or an e
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
33% API Development & Integration
33% BI & Big Data Consulting & SI
20% UX Research & Usability Testing
14% Product UX Strategy
AI Summary
“Klug Infotech partners with businesses, delivering tailored IT solutions and Agile-inspired strategies with transparency and expertise to support lasting growth and success.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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