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

Nexticode
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We develop web applications, internal tools, minimum viable products (MVPs), and APIs to support founders in their growth. Our team manages product design, coding, infrastructure, and solutions that adapt to your requirements.
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Torres Vedras, Lisbon, Pt
Services Provided
25% Custom Web Application Development
20% API Development & Integration
5% E-Commerce Development
50% Custom AI Chatbot Development
AI Summary
“Nexticode specializes in developing web applications, internal tools, MVPs, and APIs, delivering tailored product design, coding, and infrastructure solutions to support founders' growth.”
Tuendum Consulting
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🇩🇴 Más que una compañía dedicada a soluciones de red e infraestructura, nos consideramos un aliado comercial, con un enfoque en la seguridad de la información.
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Santo Domingo, Do
Services Provided
25% BI & Big Data Consulting & SI
25% API Development & Integration
25% Cybersecurity Assessments & Hardening
25% Operational Process Consulting
AI Summary
“Tuendum Consulting is a Dominican Republic-based partner specializing in network infrastructure solutions with a strong emphasis on information security and business collaboration.”
MDR Solutions
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We are skilled web developers with extensive expertise in full stack development and building highly responsive websites. With a strong passion for designing efficient and visually attractive web solutions, we excel at transforming clients' visions into reality. Our aim is to provide outstanding res
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Leszno, Greater Poland, Pl
Services Provided
40% Custom Web Application Development
20% Mobile App Development (iOS & Android)
25% API Development & Integration
15% E-Commerce Development
AI Summary
“MDR Solutions specializes in full stack web development, delivering responsive, efficient, and visually appealing websites that transform client visions and support business growth.”
Websalutem Web Development Agency
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We are an innovative IT firm committed to developing solutions that advance businesses through the latest technology and creativity. Our clients include both startups and well-established companies, all of which gain from our technological expertise. Customized solutions enhance business operations
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Riga, Lv
Services Provided
40% Custom Web Application Development
25% API Development & Integration
20% E-Commerce Development
15% Mobile App Development (iOS & Android)
AI Summary
“Websalutem Web Development Agency delivers innovative, customized IT solutions leveraging advanced technology to enhance business operations and support diverse clients from startups to established enterprises.”
Appxylo
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Appxylo is a rising provider of exceptional application development services both in the USA and internationally. We focus on delivering a wide range of web and app development solutions customized to address various business requirements. Our team of experienced professionals is dedicated to creati
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
New York, New York, Us
Services Provided
20% API Development & Integration
15% E-Commerce Development
65% Mobile App Development (iOS & Android)
AI Summary
“Appxylo delivers innovative, customized web and app development services globally, offering expert teams that enhance business growth through high-quality, scalable digital solutions across multiple platforms.”
Work Horse Integrations
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For two decades, Work Horse has implemented tailored Application Programming Interface (API) strategies to assist companies in linking their software applications and realizing digital transformation. These integrations enable our growth-oriented clients to enhance their business processes and impro
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Tallmadge, Ohio, Us
Services Provided+4 Services
25% API Development & Integration
5% BI & Big Data Consulting & SI
8% Other IT Consulting and SI
10% Cloud Consulting & SI
AI Summary
“Work Horse specializes in tailored API integrations and DevOps practices, enabling companies to enhance software connectivity, streamline workflows, and drive digital transformation for scalable growth.”
Letsync Tech
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Transforming Businesses with Digital Innovations If you're looking for a talented team proficient in contemporary technologies, LetsyncTech is your perfect partner. We will turn your vision into reality with outstanding quality that surpasses your expectations! WHY Choose LetsyncTech? Over 20 profes
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
23% Custom Web Application Development
17% API Development & Integration
10% Mobile App Development (iOS & Android)
50% Web App UI Design
AI Summary
“Letsync Tech is a skilled digital innovation partner with over 8 years' experience, delivering quality technical solutions to startups and established businesses across diverse industries.”
BEON.tech
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We match exceptional, English-speaking engineers with strong academic backgrounds, who are driven by AI, to U.S. companies seeking to expand with top talent. Recognized as the #1 firm in Clutch’s Global Staff Augmentation Services and named the #1 Great Place to Work for Millennials, we emphasize th
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Buenos Aires, Ar
Services Provided+13 Services
2% Conversational AI & Voice Assistant Development
2% AI Agent & Multi-Agent System Development
2% AI-Powered Document Processing
3% Generative AI
AI Summary
“BEON.tech matches top AI-driven English-speaking engineers with U.S. companies, delivering innovative, efficient software solutions that enhance scalability while respecting security and privacy.”
Verceed
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Verceed is a digital solutions firm that focuses on creating professional websites and management systems for businesses and institutions in Africa. We collaborate with companies, schools, SACCOs, and various organizations throughout the continent to develop solutions that draw in customers and esta
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Nairobi, Nairobi County, Ke
Services Provided
45% Custom Web Application Development
20% API Development & Integration
10% E-Commerce Development
25% Mobile App Development (iOS & Android)
AI Summary
“Verceed develops professional websites and management systems for African businesses and institutions, enhancing customer engagement and operational efficiency across various sectors.”
Int-egrate
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Int-egrate is an online consulting firm specializing in integration services. We collaborate with various iPaas (Integration Platform as a Service) technologies, including real-time integrations, APIs, EDI, ETL, and file transfers. Our expertise lies particularly in Anypoint/Mulesoft, Microsoft Azur
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Stockholm, Stockholm, Se
Services Provided
24% API Development & Integration
10% Backend Development
33% DevOps Engineering
33% Cloud Consulting & SI
AI Summary
“Int-egrate is a remote consulting firm specializing in designing, developing, deploying, and managing integration solutions across various iPaaS technologies, APIs, and DevOps services.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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