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

Growmoon
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Speed up your digital transformation by leveraging our skilled nearshore engineering teams. Whether you need seasoned Software Engineers to enhance your tech workforce or complete, managed Development Squads, we create and implement tailored technology solutions for businesses of all sizes. We can p
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
25% Mobile App Development (iOS & Android)
35% Custom Web Application Development
30% API Development & Integration
10% Blockchain & Web3 Development
AI Summary
“Growmoon accelerates digital transformation by providing tailored, nearshore software engineering teams and managed development squads, enabling rapid scaling of enterprise-level technology solutions globally.”
pep.digital GmbH
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pep.digital is your strategic ally for bespoke digitalization initiatives that enhance efficiency and innovation in medium and large organizations. We recognize that standard software often fails to meet complex needs. Thus, we create customized web and mobile applications, robust backend systems, a
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Esslingen am Neckar, Baden Wurttemberg, De
Services Provided
40% Custom Web Application Development
25% Mobile App Development (iOS & Android)
25% API Development & Integration
10% Legacy System Modernization
AI Summary
“pep.digital GmbH specializes in custom digital solutions—web, mobile, backend, AI, and integrations—to modernize processes, enhance products, and deliver measurable business value for medium and large enterprises.”
YellowFrog B.V.
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YellowFrog konzentriert sich auf intelligente Sichtbarkeit. Wir kombinieren präzises technisches SEO mit Content-Strategie, UX-Optimierung und Markenbildung – für Unternehmen, die mehr anstreben als nur Klickzahlen. Unser Ansatz basiert auf Daten, unterstützt durch KI und zielt auf nachhaltiges Wach
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided
25% API Development & Integration
25% E-Commerce Development
45% Search Engine Optimization (SEO)
5% Affiliate Marketing Program Management
AI Summary
“YellowFrog B.V. delivers strategic SEO and digital marketing services, integrating technical SEO, content, UX, and branding, leveraging data and AI for sustainable, measurable growth.”
MAD NL
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MAD NL Agency: Your Source for Innovative Graphic Design and Captivating Web Development. Our team combines technical expertise with creative talent to create tailored solutions that elevate your brand's online visibility. We prioritize security by implementing strong measures to protect your digita
Highlights
2-9
Employees
Services Provided
50% Custom Web Application Development
30% API Development & Integration
20% E-Commerce Development
AI Summary
“MAD NL Agency specializes in innovative graphic design and web development, delivering tailored, secure digital solutions that enhance brand visibility and protect online assets with expertise and care.”
Qualcosoft
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At Qualcosoft, we provide businesses with advanced technology solutions that enhance efficiency, foster innovation, and promote growth. Located in Kolkata, India, we focus on software consulting, development, and hiring contractor services (EOR), offering top-notch IT solutions customized to address
Highlights
$1,000+
Min Project Size
< $25/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
“Qualcosoft, based in Kolkata, India, delivers customized IT solutions including software consulting, development, and contractor hiring, leveraging over a decade of experience across diverse industries.”
Divsnap
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Divsnap offers React.js development through a subscription model. There are no contracts or the need to plan everything in advance. Simply sign up, submit your requests, and we will handle the rest. You can pause or cancel your subscription at any time.
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% Custom Web Application Development
20% Mobile App Development (iOS & Android)
30% API Development & Integration
AI Summary
“Divsnap provides flexible React.js development services via a subscription model, allowing clients to submit requests without contracts, with options to pause or cancel anytime.”
The CodeFlow Tech
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CodeFlowTech assists businesses and entrepreneurs in transforming their ideas into impactful digital products without the burden of managing a tech team. We create modern, scalable web and mobile applications that enable companies to operate more intelligently, expand their customer base, and accele
Highlights
< $25/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
“CodeFlow Tech develops scalable web and mobile applications, handling design, development, and maintenance to help businesses accelerate growth and enhance operations efficiently.”
Escalable
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Escalable es una compañía pionera en tecnología para la industria turística, enfocada en brindar servicios a operadores turísticos, hoteles y negocios relacionados. Ofrecemos una amplia gama de soluciones, que van desde el desarrollo de sitios web básicos y funcionales hasta completos sistemas de in
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
30% API Development & Integration
50% Custom Web Application Development
20% E-Commerce Development
AI Summary
“Escalable specializes in tailored digital solutions for the tourism industry, offering services from basic website development to comprehensive infrastructure systems for operators and hotels.”
LegalTech
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Introducing LegalTech, a forward-thinking and innovative firm that merges technology with legal expertise, effectively combining software development and legal services to support both businesses and individuals. We recognize that today’s environment requires a comprehensive approach to addressing c
Highlights
2-9
Employees
Services Provided
30% API Development & Integration
50% Custom Web Application Development
20% Mobile App Development (iOS & Android)
AI Summary
“LegalTech integrates advanced software development with legal expertise to deliver comprehensive technology-driven legal solutions for businesses and individuals, addressing diverse challenges effectively.”
Cod2b
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Code2b is a dedicated AI automation agency that assists businesses in eliminating manual tasks, slashing operational expenses by as much as 90%, and scaling effectively through smart, adaptable automation solutions. Every organization faces processes that consume time and resources, such as manual d
Highlights
$1,000+
Min Project Size
2-9
Employees
Marousi, Attica, Gr
Services Provided+3 Services
4% AI Strategy & Roadmap Consulting
9% Custom AI Chatbot Development
7% Generative AI
5% Robotic Process Automation (RPA)
AI Summary
“Code2b delivers intelligent AI-powered automation to eliminate manual tasks, reduce costs by up to 90%, and enhance operational efficiency across diverse business functions and industries.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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