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

Foo Bar
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A specialized consulting firm that concentrates on developing applications for small and medium enterprises.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Pittsburgh, Pennsylvania, Us
Services Provided
60% Custom Web Application Development
30% API Development & Integration
10% Legacy System Modernization
AI Summary
“Foo Bar is a consulting firm specializing in application development, delivering tailored technological solutions to support the growth of small and medium enterprises across industries.”
Privstr
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Privstr Ltd is a software development agency located in London that specializes in creating native mobile applications. We assist UK-based entrepreneurs, startups, and SMEs with their initial investments to produce high-quality mobile software development cycles. Our team at Privstr Ltd offers custo
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
London, England, Gb
Services Provided
60% Mobile App Development (iOS & Android)
25% API Development & Integration
15% Custom Web Application Development
AI Summary
“Privstr Ltd is a London-based software agency specializing in native iOS and Android app development, offering custom backend, API integration, UI/UX support, and comprehensive client partnership.”
Metastori
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At Metastori, we focus on comprehensive Shopify development and integrations for agencies and ambitious brands throughout Europe and beyond. We handle everything from custom theme designs and app development to intricate B2B configurations, CRO initiatives, and third-party integrations. Think of us
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Lucknow, Uttar Pradesh, In
Services Provided
60% E-Commerce Development
25% API Development & Integration
15% Custom Web Application Development
AI Summary
“Metastori delivers tailored Shopify development and integrations across Europe, offering scalable, expert solutions including custom themes, apps, B2B setups, and CRO to support agencies and brands.”
QPMSoft
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We are a team of experienced software developers based in Ukraine. Our key areas of expertise include contributing to the modernization of 12 state registries in Ukraine, with 4 of them built from the ground up. As of January 2017, there are 16,473 internal users and 28,764 external users. All these
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Kyiv, Ua
Services Provided
60% Custom Web Application Development
25% API Development & Integration
15% QA & Software Testing
AI Summary
“QPMSoft is a Ukrainian software development team specializing in complex web applications, custom software, API integration, and thorough testing, delivering high-quality solutions for resource-intensive systems.”
Stackdrop
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Stackdrop is a software development agency that focuses on creating internal business applications and automation solutions. The company collaborates with clients from various sectors to design, develop, and implement systems such as dashboards, reporting tools, workflow automation, and integrations
Highlights
10-49
Employees
Services Provided
60% Custom Web Application Development
30% API Development & Integration
10% Legacy System Modernization
AI Summary
“Stackdrop is a software development agency specializing in tailored internal business applications and automation solutions, enhancing operational efficiency through custom dashboards, integrations, and workflow optimization.”
ASN Plus s.r.o
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We partner in the development of electronics, embedded software, and applications, driven by innovative thinking. We bridge the gap between software and electronics, managing projects to deliver significant value and give our clients a competitive advantage. Our approach is systematic, as we believe
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Prague, Prague, Cz
Services Provided
30% Custom Web Application Development
30% API Development & Integration
25% Backend Development
15% Frontend Development
AI Summary
“ASN Plus s.r.o. specializes in electronics, embedded software, and application development, providing systematic project management, PCB design, manufacturing, and long-term client collaboration with clear communication.”
XsolAI
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XSOL AI is a company focused on developing artificial intelligence and machine learning solutions, providing tailored AI, machine learning, and automation services for startups, scale-ups, and enterprises around the globe. Our expertise lies in creating production-ready AI systems that transform dat
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+8 Services
5% AI Strategy & Roadmap Consulting
8% LLM Integration & Prompt Engineering
8% Custom AI Chatbot Development
8% Machine Learning Model Development
AI Summary
“XSOL AI specializes in end-to-end AI and machine learning solutions, including NLP, computer vision, and automation, serving diverse industries globally with scalable, impactful technologies.”
CataSolv
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CataSolv was established driven by a commitment to innovation and has a track record of providing revolutionary IT solutions. Our varied portfolio features partnerships with both startups and Fortune 500 companies, allowing us to offer customized solutions for every client.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Ahmedabad, Gujarat, In
Services Provided
30% API Development & Integration
35% Mobile App Development (iOS & Android)
35% Custom Web Application Development
AI Summary
“CataSolv delivers innovative, customized IT solutions to diverse clients, partnering with startups and Fortune 500 companies to address a wide range of technological needs.”
MotivFlow
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At MotivFlow, we combine strategic insight and software solutions to accelerate your progress with intelligence and assurance. We support teams throughout the entire digital transformation process, from initial architecture to final launch.
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% API Development & Integration
50% Custom Web Application Development
20% Mobile App Development (iOS & Android)
AI Summary
“MotivFlow delivers strategic insights and software solutions to support teams across the digital transformation journey, from architecture design to launch, ensuring intelligence and assurance.”
Local Data Exchange
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The leading API-First Integration Partner for Local SaaS Marketing, LDE offers intelligent API integrations tailored to your local SEO software requirements, including business listings, publisher reviews, geo grid rankings, keyword rankings, and data enhancement.
Highlights
$1,000+
Min Project Size
10-49
Employees
Services Provided
33% API Development & Integration
33% Business Intelligence (BI) Dashboard Development
27% Search Engine Optimization (SEO)
7% Other Digital Marketing
AI Summary
“Local Data Exchange specializes in API-first integrations for local SaaS marketing, delivering tailored solutions for SEO software including listings, reviews, rankings, and data enhancement.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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