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

BeaverIT
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Web development, MVP creation, SaaS solutions, automation, and CRM | Expertise in Python and React Development BeaverIT is a specialized software development team focused on creating efficient and dependable web applications and integrations for startups and expanding companies. Our expertise lies i
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
55% Custom Web Application Development
35% API Development & Integration
10% E-Commerce Development
AI Summary
“BeaverIT specializes in Python and React-based web applications, offering custom SaaS, CRM, e-commerce, automation, and API solutions tailored for startups and growth-stage companies.”
GGDX Ltd
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Reach your objectives with the help of technology. We develop strong, scalable applications, infrastructure, and websites.
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Romford, England, Gb
Services Provided
55% Custom Web Application Development
35% API Development & Integration
10% QA & Software Testing
AI Summary
“GGDX Ltd. specializes in creating robust and scalable technology solutions, including applications, infrastructure, and websites, to support clients in achieving their business objectives.”
NEXT ID SOFTWARE SRL
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Established in 2017 and operating privately in Romania, Next ID Software is fueled by a commitment to providing high-quality, dependable software solutions. Our team consists of experienced senior engineers with over two decades of expertise in delivering enterprise-level software, particularly in i
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
35% API Development & Integration
55% Custom Web Application Development
10% Mobile App Development (iOS & Android)
AI Summary
“Next ID Software, established in Romania since 2017, delivers comprehensive, custom enterprise software solutions with expert consultancy, design, and support across diverse industries using modern technologies.”
Accountaxed
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Accountaxed is an AI-driven accounting platform aimed at assisting small businesses in automating bookkeeping tasks, organizing their financial information, and streamlining accounting processes. By integrating AI with contemporary financial workflows, Accountaxed enables entrepreneurs to minimize m
Highlights
2-9
Employees
Chula Vista, California, Us
Services Provided
24% Custom AI Chatbot Development
10% AI Strategy & Roadmap Consulting
33% API Development & Integration
33% Interim C-Suite & Fractional Leadership
AI Summary
“Accountaxed is an AI-powered accounting platform designed to automate bookkeeping, streamline financial management, and provide scalable, intelligent solutions for small businesses, freelancers, and startups.”
Nextract
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Nextract is a data engineering firm led by its founders that creates tailored web scraping pipelines and data extraction APIs for organizations requiring dependable, continuous external data. We manage the entire workflow—from planning and engineering to monitoring and delivery. Clients interact dir
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Ahmedabad, Gujarat, In
Services Provided
24% BI & Big Data Consulting & SI
10% Machine Learning Model Development
33% API Development & Integration
33% Managed IT Services
AI Summary
“Nextract delivers customized web scraping and data extraction solutions, managing end-to-end workflows for reliable external data across e-commerce, quick commerce, food delivery, and major retail platforms.”
ZWEBB Fintech
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ZWEBB Fintech is a top provider of platform software for factoring, P2P lending, and investment solutions. Our primary offerings are designed to enhance cash flow for small and medium-sized enterprises (SMEs) while facilitating smooth supply chain financing. Our clientele mainly consists of banks an
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Stockholm, Stockholm, Se
Services Provided
30% API Development & Integration
20% Custom Web Application Development
50% Cloud Consulting & SI
AI Summary
“ZWEBB Fintech delivers platform software solutions in factoring, P2P lending, and investments, enhancing SME cash flows and supply chain financing across Europe, Africa, and the Middle East.”
RisingStack
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RisingStack is a comprehensive software development firm focused on creating highly scalable and robust digital solutions. We have a passion for JavaScript, Kubernetes, and Microservices.
Highlights
10-49
Employees
Budapest, Budapest, Hu
Services Provided
30% API Development & Integration
20% Custom Web Application Development
50% DevOps Engineering
AI Summary
“RisingStack is a software development firm specializing in scalable, robust digital solutions with expertise in JavaScript, Kubernetes, and microservices architectures.”
Spacemind Studio
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Leveraging our deep expertise and years of experience, we carefully design outstanding online experiences. Our goal is to stimulate business growth and enable clients to succeed in the ever-evolving digital landscape.
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Warszawa, Masovian, Pl
Services Provided
30% API Development & Integration
20% E-Commerce Development
50% Product UX Strategy
AI Summary
“Spacemind Studio specializes in crafting exceptional online experiences that drive business growth, utilizing extensive expertise to help clients succeed in a dynamic digital environment.”
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Abdul codes
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I am a solo Full-Stack Developer with a focus on backend development using Laravel, bringing over 3 years of experience collaborating with companies and clients directly. I assist businesses and individuals in establishing a robust online presence by developing scalable, user-friendly, and dependabl
Highlights
< $25/hr
Avg Hourly Rate
Ghotki, Pk
Services Provided
50% Custom Web Application Development
35% API Development & Integration
15% E-Commerce Development
AI Summary
“Abdul Codes is a solo Full-Stack Developer specializing in Laravel backend development, delivering scalable, reliable web solutions to businesses and individuals with over 3 years' experience.”
S
Syloria
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Syloria is an independent technology team located in France, specializing in embedded software, IoT systems, and secure integration. We assist startups, small and medium-sized enterprises, and industrial companies in creating durable firmware and connected devices utilizing STM32, FreeRTOS, and ROS2
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Services Provided
40% API Development & Integration
15% Custom Web Application Development
45% QA & Software Testing
AI Summary
“Syloria, based in France, excels in embedded software, IoT systems, and secure integrations, offering comprehensive firmware, connectivity, and hardware-software co-design solutions for diverse industries.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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