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

devspiration
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Devspiration assists financial services companies in developing personalized software solutions utilizing the Microsoft platform. We design web applications and enterprise software using the Microsoft .NET ecosystem, Microsoft Azure, Node.js, Angular, and React.
Highlights
$25,000+
Min Project Size
50-249
Employees
Lviv, Lviv, Ua
Services Provided+1 Services
35% Custom Web Application Development
25% Backend Development
20% Frontend Development
15% API Development & Integration
AI Summary
“Devspiration specializes in creating customized software solutions for financial services, leveraging Microsoft technologies like .NET, Azure, Node.js, Angular, and React to deliver web and enterprise applications.”
SmartDev
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Founded in 2014, SmartDev was acquired by the Verysell group in 2019 with the goal of becoming one of the Top 10 Technology Companies in Vietnam. We are a Swiss company managed by highly skilled Europeans committed to technical excellence, which we pass on to talented Vietnamese developers. Our deve
Highlights
$10,000+
Min Project Size
< $25/hr
Avg Hourly Rate
250-999
Employees
Da Nang, Da Nang, Vn
Services Provided+9 Services
8% Backend Development
12% API Development & Integration
10% Mobile App Development (iOS & Android)
4% Custom Web Application Development
AI Summary
“SmartDev, a Swiss-managed Vietnamese tech firm, excels in fintech, APIs, and mobile banking apps, delivering complex projects with a skilled 450-strong team and Agile culture.”
Taction Software LLC
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Taction Software LLC is a healthcare IT company based in the United States, established in 2013 and headquartered in Chicago, Illinois, with additional offices in Cheyenne, Wyoming, Austin, Texas, and Sacramento, California. We focus exclusively on healthcare technology, creating enterprise-level, H
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Chicago, Illinois, Us
Services Provided+7 Services
18% Custom Web Application Development
15% Mobile App Development (iOS & Android)
13% API Development & Integration
5% SaaS Product Development
AI Summary
“Taction Software LLC develops HIPAA-compliant, enterprise healthcare IT solutions including EHR integration, telemedicine, AI, and software development, ensuring regulatory compliance and security across US locations.”
Xenon Apps
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Xenon Apps, a skilled app development firm, takes pride in its proficient team that delivers solid app development solutions. Whether you're a startup aiming to create a strong online presence or a seasoned business, we offer customized solutions to meet your diverse needs. Our app development servi
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided
15% API Development & Integration
10% E-Commerce Development
65% Mobile App Development (iOS & Android)
10% Legacy System Modernization
AI Summary
“Xenon Apps is a Miami-based app development firm delivering customized, efficient, and responsive solutions across diverse platforms, serving startups and established businesses throughout Florida.”
ETIXIO
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Quickly connect with skilled developers to speed up your IT projects without any extra complications. Our teams, consistently trained in AI/Code tools like Copilot and Cursor, enhance code quality, minimize errors, and boost delivery speed. With Etixio, offshore IT is streamlined, responsive, and pe
Highlights
$10,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
40% IT Staff Augmentation
10% Other IT Consulting and SI
30% Custom Web Application Development
20% API Development & Integration
AI Summary
“Etixio provides expertly trained offshore IT teams skilled in AI code tools, delivering high-quality software development that accelerates projects and aligns with client objectives efficiently.”
JustAcademy Software Training Institute
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JustAcademy – Premier IT Training Institute in Borivali, Mumbai At JustAcademy Borivali, we empower you to embark on your IT career with assurance through practical, project-driven, and industry-aligned training programs. Our experienced instructors cover Full Stack Development (MERN & MEAN), Mobile
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Mumbai, Maharashtra, In
Services Provided
50% Mobile App Development (iOS & Android)
10% E-Commerce Development
25% Custom Web Application Development
15% API Development & Integration
AI Summary
“JustAcademy Borivali offers practical, industry-aligned IT training across Full Stack Development, Mobile Apps, Testing, Data Science, UI/UX, Digital Marketing, and DevOps with strong placement support.”
Uvik Software
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Uvik Software is a staff augmentation partner that prioritizes Python for product companies focused on SaaS, data engineering, and AI/ML. We integrate senior engineers into your engineering teams—participating in your Scrum processes, accessing your repositories, and engaging in your Slack channels—
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
London, England, Gb
Services Provided+12 Services
2% Robotic Process Automation (RPA)
5% AI Strategy & Roadmap Consulting
8% LLM Integration & Prompt Engineering
13% IT Staff Augmentation
AI Summary
“Uvik Software provides senior Python engineers for SaaS, data engineering, and AI/ML projects, integrating seamlessly with client teams to deliver scalable, secure, and efficient software solutions.”
Guru Technolabs
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Guru Technolabs is a performance-oriented software development firm that provides tailored, scalable, and secure digital solutions for startups, expanding businesses, and large enterprises. We assist organizations in designing, creating, and modernizing software products that align with their long-t
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Rajkot, Gujarat, In
Services Provided+6 Services
15% Custom Web Application Development
10% Mobile App Development (iOS & Android)
13% API Development & Integration
5% SaaS Product Development
AI Summary
“Guru Technolabs delivers tailored, scalable software solutions across industries, specializing in custom development, AI, integrations, and cloud applications, ensuring performance, security, and long-term partnership.”
Exora Leads
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ExoraLeads is a B2B digital agency that specializes in generating leads through LinkedIn, automating processes with GoHighLevel, and developing client acquisition strategies for businesses aiming for scalable and predictable growth. We assist B2B companies, SaaS providers, and professional service o
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
25% Custom Web Application Development
8% Mobile App Development (iOS & Android)
17% API Development & Integration
50% Digital Strategy
AI Summary
“ExoraLeads is a B2B digital agency specializing in LinkedIn lead generation, AI-driven CRM automation, and client acquisition strategies, delivering tailored, scalable growth solutions for businesses.”
Minicode
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Minicode is a standalone software company dedicated to transforming ambitious concepts into dependable digital solutions. Operating from our engineering center in Chișinău, we create, develop, and expand custom web and mobile applications, multi-tenant SaaS platforms, IoT dashboards, and AI automati
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Chisinau, Chisinau, Md
Services Provided+2 Services
15% Custom Web Application Development
13% Mobile App Development (iOS & Android)
7% API Development & Integration
10% SaaS Product Development
AI Summary
“Minicode delivers custom web, mobile, SaaS, IoT, and AI software solutions across diverse industries, emphasizing Agile development, quality assurance, and scalable, secure digital products.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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