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

1000software
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We are a software development company with 15 years of expertise in creating websites, digital products, and intricate technology projects. Our areas of specialization include PHP (Symfony, WordPress) and JavaScript (React, Next.js, Vue.js, Ionic, Node.js). We are here to assist you with:
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Krakow, Lesser Poland, Pl
Services Provided+2 Services
15% API Development & Integration
18% Custom Web Application Development
33% Web App UI Design
14% AI Strategy & Roadmap Consulting
AI Summary
“1000software is a seasoned software development firm specializing in PHP and JavaScript frameworks, delivering websites, digital products, and complex technology solutions for 15 years.”
Data Made Eazy
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We focus on data management, API creation, and system integration for expanding businesses. Our services range from organizing and refining your current data to developing bespoke APIs and automation processes, enabling you to reduce data disarray and gain immediate insights. Whether you need to con
Highlights
$1,000+
Min Project Size
$150+/hr
Avg Hourly Rate
2-9
Employees
Chilworth, Gb
Services Provided
14% Custom Web Application Development
20% API Development & Integration
33% Data Annotation Services
33% BI & Big Data Consulting & SI
AI Summary
“Data Made Eazy specializes in data management, custom API development, and system integration, delivering scalable solutions that enhance data quality, automation, and cross-platform connectivity for growing businesses.”
Volvrit
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We have established a solid foundation based on technology and excellence, continuously innovating with real-time solutions to support businesses navigating the intricate digital landscape. Our success stories cover more than a year, during which we have worked with both multinational corporations a
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
New Delhi, Delhi, In
Services Provided
20% API Development & Integration
14% E-Commerce Development
33% Product UX Strategy
33% CRM Consulting and SI
AI Summary
“Volvrit delivers innovative, technology-driven real-time solutions, supporting diverse clients from startups to multinationals with adaptable, high-quality services in the evolving digital landscape.”
hexops
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Hexops creates ultra-fast websites and effective marketing strategies for innovative brands.
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
25% API Development & Integration
15% Product UX Strategy
10% Interaction Design
25% Operational Process Consulting
AI Summary
“Hexops specializes in developing ultra-fast websites and delivering effective marketing strategies to support the growth of innovative brands across various industries.”
Brilworks Software
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Brilworks is a software engineering firm that focuses on AI and web development for startups, scale-ups, and large enterprises. We create intelligent, data-centric applications, ranging from custom AI/ML models and LLM-based products to scalable web platforms with strong backends and polished fronte
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Ahmedabad, Gujarat, In
Services Provided+4 Services
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
15% API Development & Integration
15% Generative AI
AI Summary
“Brilworks is a software engineering firm specializing in AI and web development, delivering custom intelligent applications and scalable platforms with comprehensive full-stack expertise and disciplined delivery.”
Codifika Technologies
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Codifikaes es una empresa tecnológica que se especializa en crear soluciones digitales personalizadas, destinadas a ayudar a las organizaciones a optimizar sus procesos, aumentar su productividad y acelerar su transformación digital. Nos encargamos del diseño y desarrollo de plataformas digitales a
Highlights
$5,000+
Min Project Size
2-9
Employees
Ciudad de Mexico, Mx
Services Provided+2 Services
20% API Development & Integration
20% Custom Web Application Development
10% Mobile App Development (iOS & Android)
20% CRM Consulting and SI
AI Summary
“Codifika Technologies specializes in tailored digital solutions including custom software, web and mobile apps, cloud integration, and process automation to enhance organizational productivity and digital transformation.”
FINGO Software House
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As a fintech-focused software company, we have been operating for 20 years. Since 2007, our banking reporting solutions have been utilized by commercial banks in Poland and across Europe, as well as over 550 cooperative banks, regulatory bodies, and two central banks in Central Europe. Our enduring
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Wroclaw, Pl
Services Provided+4 Services
20% Custom Web Application Development
5% E-Commerce Development
18% API Development & Integration
8% Legacy System Modernization
AI Summary
“FINGO Software House, a 20-year fintech software expert, specializes in custom solutions, enterprise modernization, and AI services, emphasizing reliability, innovation, and human-centric collaboration across financial sectors.”
NikoHealth
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An innovative, comprehensive cloud-based software designed for automating business processes in the home medical equipment sector. It offers an exceptional user experience, instant insights, a robust ecosystem, and APIs. Key features include Billing and Revenue Cycle Management, Inventory Management
Highlights
50-249
Employees
Middletown Township, New Jersey, Us
Services Provided
35% Custom Web Application Development
15% API Development & Integration
50% Workflow Automation (Zapier / Make / n8n)
AI Summary
“NikoHealth specializes in innovative custom cloud software development, providing robust applications with APIs tailored for the home medical equipment sector, including billing, inventory, delivery, and document management capabilities.”
ShoptivityLabs
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We're on a mission to develop digital solutions that elevate e-commerce and turn your visions into reality. We collaborate with pioneering brands that are committed to innovation and shaping the future. Our focus is on pursuing meaningful ideas. We believe in setting ambitious goals and embracing i
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
17% API Development & Integration
28% E-Commerce Development
5% CMS Development & Customization
30% Web App UI Design
AI Summary
“ShoptivityLabs develops innovative digital solutions and lasting partnerships to support evolving e-commerce businesses, providing expert technological insights and customized apps, APIs, and projects.”
FTx POS
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FTx POS offers a robust and completely customizable retail solution created by retailers for retailers. It includes POS software and hardware, integrated payment systems, age verification, inventory automation, e-commerce synchronization, digital signage, and loyalty programs. This comprehensive sys
Highlights
50-249
Employees
Rock Hill, South Carolina, Us
Services Provided+1 Services
20% Custom Web Application Development
25% Backend Development
20% API Development & Integration
25% E-Commerce Development
AI Summary
“FTx POS delivers customizable retail solutions integrating POS systems, payment processing, inventory automation, e-commerce, and loyalty programs, enhancing operations and profitability for retailers of all sizes.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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