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

SPQR Strategic Partner for Quality Resources
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SPQR, a Miami-based AI and software engineering company, assists US businesses—particularly in manufacturing and industrial sectors—in implementing AI agents and integrating automation into their operational processes. We merge US-based project management and contracting with a skilled Italian engin
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Miami, Florida, Us
Services Provided+1 Services
25% AI Agent & Multi-Agent System Development
8% BI & Big Data Consulting & SI
20% Custom Web Application Development
14% API Development & Integration
AI Summary
“SPQR provides AI-driven automation, custom software, and systems integration for US manufacturing firms, combining US project management with Italian engineering to enhance operational efficiency and visibility.”
AminZamin
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AminZamin focuses on providing advanced software and mobile application development services. By utilizing powerful technologies such as Google Cloud and AWS, we create secure and scalable web, mobile, and cloud applications customized to fit your business requirements. Collaborate with us to enhanc
Highlights
$1,000+
Min Project Size
2-9
Employees
Services Provided
20% API Development & Integration
35% Custom Web Application Development
35% Mobile App Development (iOS & Android)
10% E-Commerce Development
AI Summary
“AminZamin delivers secure, scalable software and mobile app development services using technologies like Google Cloud and AWS, providing tailored IT solutions to enhance business operations.”
Aionys
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We assist businesses in addressing skill shortages, speeding up development, optimizing workflows, and scaling efficiently. Our flexible IT solutions, backed by experts, help minimize risks, lower expenses, and achieve quicker outcomes. Here's how we can help: ✅ Support startups – We transform ideas
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Sofia, Sofia, Bg
Services Provided+5 Services
8% Legacy System Modernization
13% API Development & Integration
5% Mobile App Development (iOS & Android)
25% Custom Web Application Development
AI Summary
“Aionys delivers expert IT solutions across healthcare, fintech, real estate, and more, accelerating development, optimizing workflows, and scaling businesses with innovative technologies and 24/7 support.”
2Simple
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We are 2Simple, a Polish software company dedicated to providing innovative, custom software solutions for clients in various industries. While we have a strong focus on the medical, banking, and transportation sectors, we are open to projects from other fields as well. Our talented team of develope
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Piotrkow Trybunalski, Lodz, Pl
Services Provided+1 Services
8% QA & Software Testing
15% Mobile App Development (iOS & Android)
15% API Development & Integration
12% Custom Web Application Development
AI Summary
“2Simple is a Polish software company delivering tailored web, mobile, and IT consulting solutions across medical, banking, transportation, and diverse industries to enhance business performance.”
Digital Mettle
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Digital Mettle specializes in creating, developing, and supporting tailored software solutions for various clients. Since our inception in May 2001, we have successfully completed over 200 projects for nearly 100 clients. Our experienced and established team is prepared to handle software developmen
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Raleigh, North Carolina, Us
Services Provided+2 Services
25% Custom Web Application Development
13% API Development & Integration
7% Mobile App Development (iOS & Android)
5% Web App UI Design
AI Summary
“Digital Mettle delivers tailored software and mobile solutions, API integration, and strategic IT consulting with regulatory compliance expertise, supporting diverse industries and clients since 2001.”
Royal Software
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Royal Software is a web development company that focuses on website design, mobile app development, and tailored software solutions. If you're looking for an affordable provider of web design and software services, we invite you to talk to us. Our expertise lies in creating visually appealing, user-
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
45% Custom Web Application Development
35% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“Royal Software specializes in affordable, user-friendly web design, mobile app development, tailored software solutions, and secure API integration to enhance business operations and customer engagement.”
BoostHigh
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BoostHigh specializes in tailored software development for businesses, acting as a tech partner that addresses all your specific software needs. We merge our engineering expertise with a thorough, goal-oriented business analysis to facilitate digital transformation in every project we undertake. Our
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Bydgoszcz, Kuyavian Pomeranian, Pl
Services Provided
40% Custom Web Application Development
30% Backend Development
20% Frontend Development
10% API Development & Integration
AI Summary
“BoostHigh delivers customized software solutions across web, IoT, and device programming, combining engineering expertise with business analysis to enable digital transformation and seamless project execution.”
BitBlitz LTD
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BitBlitz LTD is an innovative software development firm located in Plovdiv, Bulgaria, providing advanced web, mobile, and backend solutions to clients around the globe. With extensive practical experience in software engineering and system integration, we assist startups, small businesses, and large
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
45% Custom Web Application Development
35% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“BitBlitz LTD is a Bulgarian software firm delivering custom web, mobile, backend, and cloud solutions, specializing in scalable, high-performance systems for diverse business needs globally.”
VGTS Tech Company
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VGTS Tech Company is a product engineering firm focused on AI, assisting mid-sized businesses in designing, building, and scaling intelligent software systems. Since our establishment in 2016, we have collaborated with firms in the FinTech, eCommerce, and EdTech sectors to transform intricate AI goa
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Chennai, Tamil Nadu, In
Services Provided+6 Services
5% AI Strategy & Roadmap Consulting
10% LLM Integration & Prompt Engineering
8% Custom AI Chatbot Development
8% Machine Learning Model Development
AI Summary
“VGTS Tech Company develops reliable AI-powered software solutions for mid-sized FinTech, eCommerce, and EdTech firms, specializing in generative AI, voice automation, and scalable intelligent systems.”
Berrynoon
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We assist forward-thinking companies in enhancing their digital presence and growing confidently, ranging from web applications to AI solutions. Your success is our top priority.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Casablanca, Ma
Services Provided+1 Services
30% Custom Web Application Development
15% API Development & Integration
5% Legacy System Modernization
28% AI Agent & Multi-Agent System Development
AI Summary
“Berrynoon specializes in enhancing digital presence and growth for innovative companies, offering expertise from web applications to AI solutions focused on client success.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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