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

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No-Code Venture
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At No-Code Venture, we focus on creating robust mobile applications that quickly transform ideas into scalable digital products. Utilizing no-code platforms like Bubble, along with React Native and native mobile technologies such as Swift UI and Kotlin, we assist both startups and large enterprises
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Hilversum, North Holland, Nl
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% Cloud Consulting & SI
AI Summary
“No-Code Venture specializes in rapid development of scalable mobile applications using no-code and native technologies, serving startups and enterprises across finance, retail, and education sectors globally.”
Zelo Industrial Solutions
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We are "Zelo Industrial Solutions d.o.o.", a specialized software engineering boutique focused on information systems for manufacturing. Established in 2015 by a group of seasoned engineers with decades of experience in developing systems under various names, we share common elements such as connect
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Zagreb, Grad Zagreb, Hr
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% Other IT Consulting and SI
AI Summary
“Zelo Industrial Solutions specializes in customized manufacturing information systems including SCADA, MES, and OT/IT integrations, focusing on cloud, IoT, and Edge technologies since 2002.”
Set & Forget
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We specialize in process automation and custom software solutions for Google Workspace. Our team has assisted more than 50 businesses in automating their operations, allowing them to concentrate on their primary objectives. We have extensive experience in creating and implementing various solutions,
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Buenos Aires, Buenos Aires, Ar
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% IT Staff Augmentation
AI Summary
“Set & Forget delivers tailored automation and software solutions across Google Workspace, web, and data platforms, enabling businesses to optimize operations and realize impactful digital projects.”
Drupal Digital
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Drupal Digital is a forward-thinking web development firm that specializes in building powerful and dynamic websites with Drupal and WordPress. Located in India, we are committed to providing exceptional digital solutions that cater to the specific requirements of our clients. Our talented team of d
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
New Delhi, Delhi, In
Services Provided
15% API Development & Integration
35% Custom Web Application Development
50% DevOps Engineering
AI Summary
“Drupal Digital is an India-based web development firm specializing in customized, scalable, and secure Drupal and WordPress websites tailored to client business goals and growth.”
Scarabite
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Scarabite Intelligent Systems is a bespoke software company that provides AI, data infrastructure, and cloud services to organizations that require production-level systems rather than mere prototypes. We focus on four main service areas and typically serve businesses that lose revenue, efficiency,
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Thessaloniki, Gr
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% Generative AI
AI Summary
“Scarabite Intelligent Systems delivers bespoke AI, data infrastructure, and cloud solutions, bridging data and decision-making gaps with deployable systems for businesses and agencies.”
Sort {IT} Out
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Sort {IT} Out assists small and mid-sized businesses in streamlining their internal operations. We create customized internal tools, automate workflows, develop dashboards, build data-processing utilities, integrate APIs, and establish secure client/team portals for companies overwhelmed by manual t
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Kyiv, Ua
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% BI & Big Data Consulting & SI
AI Summary
“Sort {IT} Out specializes in creating customized internal tools and automations that streamline operations for small to mid-sized businesses, enhancing efficiency, reducing errors, and supporting scalable growth.”
ASR Training and Development
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We are a software development firm that offers dedicated remote teams and ongoing technical assistance to expanding businesses. We assist startups and small to medium enterprises in scaling their products through dependable developers, effective communication, and adaptable long-term agreements. Our
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Abu Dhabi, Abu Zaby, Ae
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% AI Agent & Multi-Agent System Development
AI Summary
“ASR Training and Development specializes in providing remote software development teams and technical support, enabling startups and SMEs to scale products with quality and reliable long-term partnerships.”
AXCEL
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AXCEL is a comprehensive development firm established in 2015 that aids startups, small to medium-sized enterprises (SMEs), and large corporations in creating secure, scalable, and high-performing digital products. Our skilled team of 10-49 developers focuses on custom web solutions, Shopify and Woo
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Lahore, Pk Punjab, Pk
Services Provided+2 Services
4% Mobile App Development (iOS & Android)
10% API Development & Integration
10% E-Commerce Development
10% Custom Web Application Development
AI Summary
“AXCEL is a versatile development firm specializing in custom web, e-commerce, SaaS, and CRM solutions, delivering secure, scalable, and user-friendly digital products for diverse industries.”
Pro Sistemos
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We develop strong, tailored .NET applications, ranging from desktop software for Windows and Mac to dynamic web-based solutions, prioritizing close collaboration with our clients.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Kaunas, Lt
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% Robotic Process Automation (RPA)
AI Summary
“Pro Sistemos develops customized .NET applications including desktop and web-based solutions, focusing on tailored software for Windows, Mac, and collaborative client engagement.”
Iono Technology
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IONO is at the forefront of innovation and excellence in software and integration solutions. Founded in 2023, our company focuses on delivering state-of-the-art software services. We specialize in creating unmatched experiences by combining technical knowledge with creative problem-solving. Our dedi
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Cairo, Cairo, Eg
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% AI Strategy & Roadmap Consulting
AI Summary
“IONO Technology, founded in 2023, specializes in innovative software and integration solutions, emphasizing exceptional user experiences, professional development, and advancing technology to enhance lives.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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