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

Next Level Software
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Next Level Software is a mobile app development firm that assists startups and businesses in creating scalable digital products that are utilized by users globally. With over 7 years of experience and more than 100 successful projects under our belt, our team excels at developing high-performance mo
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Faisalabad, Pk Punjab, Pk
Services Provided
50% Mobile App Development (iOS & Android)
15% Custom Web Application Development
15% API Development & Integration
20% SaaS Product Development
AI Summary
“Next Level Software specializes in scalable, high-performance mobile and web application development, offering startups and businesses comprehensive solutions from MVPs to production-ready digital products.”
PRZ Fusion Technology
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PRZ Fusion Technology is a comprehensive software and IT solutions provider focused on equipping businesses with advanced digital tools for the future. We create and implement a diverse range of customized software, including ERP systems, HRMS and payroll platforms, accounting tools, and complete au
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
50% Custom Web Application Development
25% API Development & Integration
25% E-Commerce Development
AI Summary
“PRZ Fusion Technology delivers customized software and IT solutions across industries, integrating AI and automation to optimize operations, enhance efficiency, and support long-term business growth.”
Qualium Systems
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Got an idea? Let's chat! Reach out to us at info@qualium-systems.com. We are a software development company certified in ISO/IEC 27001 and ISO 9001, with a focus on VR/AR, mobile, and web applications for digital agencies and tech companies. We possess the expertise and capabilities to create someth
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided
30% Custom Web Application Development
40% Mobile App Development (iOS & Android)
10% E-Commerce Development
20% API Development & Integration
AI Summary
“Qualium Systems is an ISO-certified software development firm specializing in VR/AR, mobile, and web applications, delivering high-quality solutions through Agile practices and comprehensive services.”
Devessence
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We are a global technology consultancy with a personalized touch, dedicated to providing modern Microsoft software solutions. At Devessence, we aim to capture the true spirit of software development, ensuring that our technology solutions are perfectly tailored to meet the unique business needs of o
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Jupiter, Florida, Us
Services Provided
25% Custom Web Application Development
15% API Development & Integration
10% CMS Development & Customization
50% Cloud Consulting & SI
AI Summary
“Devessence is a global consultancy specializing in tailored Microsoft software solutions, fostering close client partnerships to deliver impactful, strategic, and innovative digital experiences across diverse industries.”
LOVATA sp. z o.o.
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LOVATA offers software development services utilizing open-source technologies, specifically designed to meet your distinct business requirements. ABOUT US: WE CREATE: TOOLS AND TECHNOLOGIES:
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Poznan, Greater Poland, Pl
Services Provided
15% API Development & Integration
25% Custom Web Application Development
10% E-Commerce Development
50% Web App UI Design
AI Summary
“LOVATA sp. z o.o. specializes in software development using open-source technologies, delivering tailored solutions that address unique business needs across diverse sectors.”
SIRO Digital Agency
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SIRO is a technical consulting and digital development agency that focuses on creating tailored web solutions to help businesses grow confidently. For almost twenty years, we have collaborated with brands, startups, and creative agencies to provide websites, applications, and digital platforms that
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Austin, Texas, Us
Services Provided+1 Services
18% API Development & Integration
15% Mobile App Development (iOS & Android)
20% Interaction Design
14% UX Research & Usability Testing
AI Summary
“SIRO Digital Agency delivers tailored web and app development, technical consulting, and AI-enhanced solutions, leveraging two decades of expertise to empower business growth with scalable, efficient digital platforms.”
Quintes Global Private Limited
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At Quintes Global, we excel in converting your business operations into Global Capability Centers (GCCs) using our innovative, AI-driven Captive & Capability models, which include Dedicated GCCs, Assisted/Managed Global Business Services (GBS), Centres of Excellence/Expertise (CoEs), and more. Our v
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
250-999
Employees
New Delhi, Delhi, In
Services Provided+2 Services
15% LLM Integration & Prompt Engineering
8% AI Strategy & Roadmap Consulting
2% Robotic Process Automation (RPA)
25% API Development & Integration
AI Summary
“Quintes Global specializes in transforming business operations into AI-driven Global Capability Centers and services, delivering tech-integrated solutions that enhance performance and create lasting value.”
Alvera Solutions OÜ
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Our company offers a complete range of services for the design, development, integration, and support of SAP solutions. With over 10 years of experience, our team's thorough approach to expert assessment, product management, and business development enables our clients to maximize their returns on i
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Tallinn, Harju, Ee
Services Provided+1 Services
8% Custom Web Application Development
12% Backend Development
20% API Development & Integration
10% ERP & CRM Development
AI Summary
“Alvera Solutions OÜ provides comprehensive SAP design, development, integration, and support services, leveraging over 10 years of expertise to optimize clients' SAP investments effectively.”
Digital Butlers
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We create clear, distinctive, and scalable websites and applications that truly succeed. Our expertise includes: ✅ DISCOVERY, providing you with a defined scope, budget, timeline, and a roadmap from concept to launch. ✅ UX RESEARCH, delivering wireframes based on user objectives and challenges, deve
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Limassol, Cy
Services Provided+3 Services
25% Custom Web Application Development
18% API Development & Integration
8% Frontend Development
12% Product UX Strategy
AI Summary
“Digital Butlers specializes in creating scalable, user-centric websites and applications through comprehensive services including discovery, UX research, UI design, development, integrations, and post-launch support.”
WinWeb
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WinWeb boasts more than 12 years of expertise in creating modern, innovative, high-quality open source websites that serve as genuine digital assets. In addition to website development, we offer comprehensive services for enhancing existing sites, along with development and Google optimization. Our
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Il
Services Provided+1 Services
20% API Development & Integration
20% CRM Consulting and SI
20% E-Commerce Development
20% Web App UI Design
AI Summary
“WinWeb excels in Software Development with robust API Development, specialized E-Commerce Development using WooCommerce, and CMS expertise in WordPress and Joomla, providing custom web solutions tailored to clients' needs.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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