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

HashOne Global Inc.
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Welcome to HashOne Global, where our mission is to facilitate your digital transformation. Since our shift from a creative agency in 2016, we have established ourselves as a leader in the realm of digital transformation and resource enhancement. We specialize in converting intricate digital obstacle
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided+4 Services
23% Custom Web Application Development
8% Mobile App Development (iOS & Android)
15% API Development & Integration
5% Legacy System Modernization
AI Summary
“HashOne Global Inc. drives digital transformation through tailored software development, cloud consulting, and resource augmentation, delivering innovative, scalable solutions across diverse digital platforms with expert partnership.”
CodingCenter
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Welcome to Code Service Center! We specialize in creating Cross-platform (Hybrid) Apps using Google's Flutter for both Android and iOS (iPhone/iPad) platforms, ensuring superior quality, adherence to coding standards, and support for the latest APIs/SDKs within the agreed timeline. Our team consist
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided
70% Mobile App Development (iOS & Android)
15% Backend Development
15% API Development & Integration
AI Summary
“CodingCenter develops high-quality cross-platform mobile apps using Flutter, offering comprehensive services from design to deployment, with quality assurance and client-focused revisions ensuring timely, cost-effective solutions.”
EleraSoft
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Our company was founded to deliver cutting-edge software solutions, leveraging 30 years of expertise in software and technology. Our skilled team creates advanced applications for Windows, Web, and Mobile platforms, diligently adhering to the latest technological developments to address the unique r
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% API Development & Integration
50% Custom Web Application Development
15% Legacy System Modernization
15% QA & Software Testing
AI Summary
“EleraSoft specializes in advanced software solutions across Windows, Web, and Mobile platforms, offering diverse products including museum, document, HR, and event management systems.”
Resolventa
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Resolventa is a web and mobile development firm that specializes in creating custom software solutions for startups, automating processes for small and medium-sized businesses, and developing enterprise software applications. Being a small company gives us an advantage—our processes are streamlined
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Astana, Kz
Services Provided+5 Services
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
15% API Development & Integration
10% SaaS Product Development
AI Summary
“Resolventa specializes in custom web and mobile software development, delivering quality solutions for startups, SMBs, and enterprises with streamlined processes and expertise in PHP, Symfony, Laravel, JavaScript, and Vue.js.”
LogicSpark Technology LLP
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LogicSpark Technology LLP is a comprehensive software development firm focused on creating customized, AI-powered solutions that revolutionize businesses. With proficiency in web, mobile, and desktop applications, LogicSpark produces high-caliber software specifically designed to meet your requireme
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Ahmedabad, Gujarat, In
Services Provided+1 Services
25% Custom Web Application Development
20% API Development & Integration
25% Mobile App Development (iOS & Android)
20% Backend Development
AI Summary
“LogicSpark Technology LLP is a software development firm specializing in AI-powered, customized web, mobile, and desktop solutions, offering end-to-end services to enhance business operations and digital experiences.”
Barney Global LLC
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We create websites, applications, and AI integrations tailored to your personal projects or business needs. Barney Global is open to collaborating with various projects and offers software engineering and programming services for any initiative you have in mind.
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
St. George, Utah, Us
Services Provided+1 Services
33% Custom Web Application Development
17% API Development & Integration
20% Machine Learning Model Development
20% Custom AI Chatbot Development
AI Summary
“Barney Global LLC specializes in software engineering, delivering custom websites, applications, and AI integrations tailored to diverse business and personal projects with collaborative flexibility.”
Taskov Group
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Taskov Group creates tailored software, web applications, mobile applications, and AI automation solutions for expanding businesses. We assist companies in addressing genuine business challenges through effective technology. Whether you require a website to showcase your business, a customized syste
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Mk
Services Provided
50% Software Development Services
20% AI Agent & Multi-Agent System Development
15% API Development & Integration
15% Custom Web Application Development
AI Summary
“Taskov Group excels in creating custom software and web applications, offering robust backend and frontend development alongside API integration, perfectly matching their focus on comprehensive software development solutions.”
ina Payments
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Welcome to ina Payments, your trusted technology partner for enhanced payment solutions. We founded ina Payments with the goal of transforming the payment industry by offering a wide range of services and solutions that address all your payment requirements.
Highlights
10-49
Employees
Hyderabad, Telangana, In
Services Provided+3 Services
25% Custom Web Application Development
20% API Development & Integration
5% Mobile App Development (iOS & Android)
20% Product Design
AI Summary
“ina Payments is a technology partner offering comprehensive payment solutions that transform the industry, addressing diverse payment needs with innovative services and reliable technology.”
360 Core Inc
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Leveraging cutting-edge technologies, we create Blockchain solutions that are ready for the future, tailored for tech-oriented startups, scale-ups, and enterprises. 360Core Inc., a premier blockchain development firm based in Dubai, offers a wealth of experience with solutions that address various i
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Dubai, Dubayy, Ae
Services Provided
60% Blockchain & Web3 Development
10% Mobile App Development (iOS & Android)
15% API Development & Integration
15% Custom Web Application Development
AI Summary
“360Core Inc. is a Dubai-based blockchain development firm specializing in innovative decentralized applications, smart contracts, NFTs, and consulting, enhancing business efficiency and security for diverse industries.”
NOTUM Technologies
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At Notum, we assist businesses in overcoming CMS challenges and accelerating their growth using Strapi and Next.js. We have successfully completed over 100 projects for clients such as AXA, Salt, Direct Insurance, and Konica Minolta, supporting platforms that serve more than 10 million users daily.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Brno, South Moravia, Cz
Services Provided+3 Services
30% Custom Web Application Development
10% Mobile App Development (iOS & Android)
10% API Development & Integration
15% Product UX Strategy
AI Summary
“NOTUM Technologies specializes in scalable CMS solutions using Strapi and Next.js, delivering tailored integrations and support to global clients, facilitating seamless growth and digital transformation.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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