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

Appopoleis Studios
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Appopoleis creates AI production systems tailored for logistics, maritime, healthcare, and B2B operations teams. Our offerings range from custom AI agents and WhatsApp AI for business to on-site LLM infrastructure, voice-first automation, and AI-driven mobile applications. We do not offer standard s
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Mira Bhayandar, Maharashtra, In
Services Provided
35% Mobile App Development (iOS & Android)
15% API Development & Integration
33% AI Agent & Multi-Agent System Development
17% LLM Integration & Prompt Engineering
AI Summary
“Appopoleis Studios specializes in custom AI production systems across logistics, maritime, healthcare, and B2B sectors, delivering tailored solutions including AI agents, voice automation, and mobile applications.”
Groovy Technoweb Pvt. Ltd.
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Groovy Web is an engineering agency that prioritizes AI in its approach. We don't just create software; we integrate AI into every aspect of our workflows. Our engineers utilize AI agents, code assistants, and multi-agent systems throughout all stages of development, from planning and design to test
Highlights
$10,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Nadiad, Gujarat, In
Services Provided+1 Services
13% Mobile App Development (iOS & Android)
25% Custom Web Application Development
12% API Development & Integration
30% AI Agent & Multi-Agent System Development
AI Summary
“Groovy Technoweb Pvt. Ltd. is an AI-driven engineering agency specializing in accelerated software development, integrating AI across mobile, web, and custom application solutions for diverse industries.”
Argo22
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At Argo22, we design bespoke mobile applications that empower businesses to innovate, grow, and engage with their users. Whether it's a polished MVP or a comprehensive app packed with features, we transform your ideas into mobile experiences that provide substantial value. In addition to mobile deve
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Ceske Budejovice, South Bohemia, Cz
Services Provided+1 Services
25% Mobile App Development (iOS & Android)
5% E-Commerce Development
8% API Development & Integration
12% Custom Web Application Development
AI Summary
“Argo22 specializes in bespoke mobile and web applications, delivering scalable digital solutions across sectors like e-commerce, energy, and banking to support business innovation and growth.”
CodeIQ
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CodeIQ – Digital Agency in Rotterdam | Laravel, Shopify & AI Solutions CodeIQ is a result-oriented digital agency located in Rotterdam, specializing in custom software development, e-commerce solutions, and AI-driven tools. Since our inception in 2017, we have collaborated with brands such as Knol
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Rotterdam, South Holland, Nl
Services Provided
30% Custom Web Application Development
13% API Development & Integration
7% Mobile App Development (iOS & Android)
50% Machine Learning Model Development
AI Summary
“CodeIQ, a Rotterdam-based digital agency founded in 2017, specializes in custom software, e-commerce, AI solutions, and scalable digital products using Laravel, Shopify, and Swift, emphasizing quality and measurable results.”
Vamsi Krishna
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I’m a web developer based in India with over a decade of experience in PHP and more than eight years with frameworks such as Laravel and CodeIgniter. My expertise includes working on various SaaS platforms, CRM systems, booking applications, and user-centric web products. Throughout my career, I hav
Highlights
< $25/hr
Avg Hourly Rate
Services Provided
20% API Development & Integration
5% E-Commerce Development
25% Custom Web Application Development
50% CRM Consulting and SI
AI Summary
“Vamsi Krishna is an experienced Indian web developer specializing in PHP, Laravel, and CodeIgniter, creating scalable SaaS platforms, CRM systems, and optimized database solutions.”
DBD Tech
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DBD Tech realizuje projekty informatyczne dla sektora publicznego, w tym outsourcing zasobów do projektu e-Zdrowie. Zespół rozwijał Portal Komunikacji Obywatelskiej wraz z jego wersją mobilną i integracją z Krajowym Węzłem Tożsamości, system wspomagający certyfikację dla Centralnego Ośrodka Badań Ja
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
60% Mobile App Development (iOS & Android)
15% API Development & Integration
15% Custom Web Application Development
10% Frontend Development
AI Summary
“DBD Tech is a technology firm specializing in custom software solutions, mobile and web application development, leveraging modern frameworks like Flutter and VueJS to deliver tailored digital products.”
TechAbbot Technology Services Pvt. Ltd.
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TechAbbot is a group of skilled software engineers, technology enthusiasts, consultants, and creative designers dedicated to offering affordable solutions to everyone. Our team specializes in developing web and mobile applications. By outsourcing your software development tasks to us, you can receiv
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Ahmedabad, Gujarat, In
Services Provided
40% Mobile App Development (iOS & Android)
15% API Development & Integration
35% Custom Web Application Development
10% Legacy System Modernization
AI Summary
“TechAbbot Technology Services Pvt. Ltd. offers affordable, high-quality custom software solutions including web, mobile, and desktop application development, emphasizing transparency and client satisfaction.”
Conversion Beast
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We are a performance marketing partner dedicated to accelerating the growth of service-oriented businesses and enabling agencies to scale more effectively. Our offerings encompass advertising, sales funnels, websites, SEO, and automation, all crafted to maximize conversions and provide measurable re
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+6 Services
20% API Development & Integration
20% Product UX Strategy
20% Graphic Design
7% Pay Per Click
AI Summary
“Conversion Beast specializes in performance marketing services including advertising, sales funnels, websites, SEO, and automation to drive measurable growth for service businesses and agencies.”
Techiosos
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Techiosos is a bespoke development firm dedicated to creating high-performing digital solutions that meet the demands of contemporary businesses. We excel in building scalable websites and web applications featuring streamlined architecture, enhanced performance, and effortless user experiences. Eac
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Toronto, Ontario, Ca
Services Provided+3 Services
30% Custom Web Application Development
5% Mobile App Development (iOS & Android)
20% API Development & Integration
5% E-Commerce Development
AI Summary
“Techiosos specializes in bespoke web and application development, optimizing performance and maintaining scalable, efficient digital solutions to support sustained business growth and user engagement.”
Lambda Logics
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Lambda Logics utilizes years of industry knowledge to address your changing business requirements. Our offerings go beyond conventional IT infrastructure, providing innovative IT solutions that enable you to remain competitive in the ever-changing digital landscape.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Lahore, Pk Punjab, Pk
Services Provided+2 Services
20% API Development & Integration
13% Custom Web Application Development
18% Product UX Strategy
15% Web App UI Design
AI Summary
“Lambda Logics leverages extensive industry expertise to deliver innovative IT solutions that help businesses adapt and stay competitive amid evolving digital challenges.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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