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

Inovaflow
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Inovaflow (INOVA Management s.r.o.) is an engineering firm specializing in integration that creates MCP servers, API integrations, and platform connectors for B2B SaaS providers. Additionally, Inovaflow acts as an outsourced implementation partner for SaaS vendors, handling the entire deployment of
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Prague, Prague, Cz
Services Provided
24% API Development & Integration
10% Custom Web Application Development
33% Managed IT Services
33% AI Agent & Multi-Agent System Development
AI Summary
“Inovaflow is a Prague-based engineering firm specializing in seamless integration solutions, offering MCP servers, API connectors, and outsourced SaaS deployment with full source code delivery.”
Seeed
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Seeed is a software agency located in Miami, focusing on tailored Square integrations, headless commerce solutions, and AI-compatible digital products for mid-sized businesses. We are recognized as Square’s top developer partner, having won four hackathons over three consecutive years. Our team deve
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Miami, Florida, Us
Services Provided+1 Services
17% API Development & Integration
14% Custom Web Application Development
3% E-Commerce Development
33% Cloud Consulting & SI
AI Summary
“Seeed, a Miami-based software agency, specializes in custom Square integrations, headless commerce platforms, and tailored AI-compatible digital products, delivering scalable solutions for mid-sized businesses.”
Rayyone
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Rayyone was established by a team of skilled developers with extensive experience in global projects. They primarily offer two services: developing MVP products and creating offshore teams for early-stage startups. Their approach is straightforward, transparent, and dependable. Rather than using fla
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Da Nang, Da Nang, Vn
Services Provided
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% API Development & Integration
10% E-Commerce Development
AI Summary
“Rayyone specializes in developing MVP products and establishing offshore teams for early-stage startups, focusing on straightforward, reliable, and innovative tech solutions without marketing embellishments.”
IC Studio
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IC Studio is a software development firm located in Kharkiv, Ukraine. We specialize in creating tailored web and mobile applications, collaborating with both B2B and B2C clients across Europe. 🇺🇦 Our team has relocated from Ukraine to a safe environment and we are continuing our operations with an
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kharkiv, Kharkiv, Ua
Services Provided
40% Custom Web Application Development
30% E-Commerce Development
20% API Development & Integration
10% ERP & CRM Development
AI Summary
“IC Studio is a Ukrainian software development firm specializing in custom web and mobile applications, offering solutions in e-commerce, CRM, ERP, and portals with a focus on user experience and productivity.”
DESNEA
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DESNEA is a company based in the northeast of Argentina. We create digital solutions that meet the business requirements of our clients through collaborative efforts. With over a decade of experience, we specialize in developing web applications, APIs, and mobile applications, both on-site and offsh
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Buenos Aires, Ar
Services Provided
30% Mobile App Development (iOS & Android)
40% Custom Web Application Development
30% API Development & Integration
AI Summary
“DESNEA, based in northeast Argentina, delivers high-quality digital solutions including web and mobile applications, specializing in process optimization and collaborative development with ISO 9001:2015 certification.”
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Mitchell Tech Solutions
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Are you ready to navigate the complexities of the modern digital business landscape? Mitchell Tech Solutions offers digital transformation services that serve as a valuable partner for your business. We specialize in helping companies across different industries transition from outdated systems to m
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
33% API Development & Integration
23% ERP Consulting and SI
10% Robotic Process Automation (RPA)
20% Change Management Consulting
AI Summary
“Mitchell Tech Solutions specializes in digital transformation services, empowering Oklahoma businesses to modernize operations and succeed across industries through strategic technology adoption.”
Kodex Labs
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Kodex Labs - Data Demystified. AI Implemented. Kodex Labs is a consultancy focused on data engineering, advanced analytics, and artificial intelligence, recognized for transforming intricate environments into strong, dependable, and scalable data platforms. We merge extensive technical knowledge wit
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
London, England, Gb
Services Provided+7 Services
5% Cloud Consulting & SI
3% IT Staff Augmentation
5% Machine Learning Model Development
3% Custom AI Chatbot Development
AI Summary
“Kodex Labs specializes in data engineering, analytics, and AI, delivering scalable, secure data platforms and strategic consulting to drive innovation and informed, data-driven decision-making.”
Scaleroot Technologies
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Scaleroot Technologies focuses on secure cloud architecture, DevSecOps automation, Kubernetes, and compliant infrastructure for regulated sectors like healthcare and clinical research. We create and implement cloud-native solutions that emphasize: • Security by design • Infrastructure as Code (IaC)
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Bengaluru, Karnataka, In
Services Provided+8 Services
4% Cloud Consulting & SI
3% AI Agent & Multi-Agent System Development
2% Machine Learning Model Development
2% Custom AI Chatbot Development
AI Summary
“Scaleroot Technologies delivers secure, compliant cloud-native solutions integrating DevSecOps automation, Kubernetes, and infrastructure as code, specializing in regulated healthcare and clinical research sectors.”
Testerly
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Who are we? Testerly is a team of integrated professionals with more than 15 years of expertise in software development, both automated and manual testing, e-commerce, and product management. We focus on delivering product-oriented solutions that align with the unique business needs of each client,
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Lodz, Lodz, Pl
Services Provided
55% Custom Web Application Development
25% E-Commerce Development
20% API Development & Integration
AI Summary
“Testerly delivers tailored software development, automated/manual testing, and AI reliability solutions, leveraging 15+ years of expertise and diverse technologies to support scalable, dependable client outcomes.”
Rigyasa Technologies
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Shaping the Future Today. Rigyasa Technologies is a progressive tech solutions provider offering web development, AI tools, and digital transformation services to businesses around the globe. We drive growth with intelligent technology.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
30% API Development & Integration
20% Mobile App Development (iOS & Android)
25% Mobile App UI Design
25% Web App UI Design
AI Summary
“Rigyasa Technologies delivers innovative web development, AI, and digital transformation solutions worldwide, empowering businesses to achieve growth through intelligent technology and modern digital services.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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