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

Webbex Innovative India
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At Webbex India, we believe that your website should serve a purpose beyond aesthetics; it should help your business flourish. We specialize in tailored web design and development services that exceed the capabilities of typical platforms. Whether you’re launching your first website as a business ow
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+10 Services
3% API Development & Integration
4% Mobile App Development (iOS & Android)
9% Custom Web Application Development
17% UX Research & Usability Testing
AI Summary
“Webbex Innovative India offers customized, visually appealing, and technically robust web design and development services, helping businesses attract, engage, and convert online visitors effectively.”
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Duelz Lab LLP
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Qsquare is a SaaS partner that utilizes AI to develop and automate large-scale business solutions. We have successfully launched production-grade software for over three clients and take pride in our personalized approach, which ensures complete dedication to your vision. Our integrated engineering
Highlights
$1,000+
Min Project Size
2-9
Employees
Ahmedabad, Gujarat, In
Services Provided+6 Services
12% Custom Web Application Development
4% API Development & Integration
1% E-Commerce Development
17% UX Research & Usability Testing
AI Summary
“Duelz Lab LLP, through its SaaS partner Qsquare, develops AI-driven, large-scale business solutions with a personalized, agile approach, delivering reliable, customized software efficiently.”
Responsive Root Technologies
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Promoting the advancement of cutting-edge digital technologies that lead innovation, ResponsiveRoot enables businesses to adapt to the future, driving exceptional success in the rapidly changing digital realm. Our specialized team includes researchers, strategists, designers, developers, and project
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+11 Services
8% Custom Web Application Development
5% Mobile App Development (iOS & Android)
5% API Development & Integration
2% E-Commerce Development
AI Summary
“Responsive Root Technologies specializes in advancing digital innovations by integrating research and design to deliver strategic, cohesive solutions that empower businesses to succeed in dynamic environments.”
Kashi Infotech
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Kashi Infotech provides services in web development, digital marketing, and content writing, with a commitment to delivering quality work on time and prioritizing client satisfaction. Our goal is to enhance the online presence of both individuals and organizations. We have a team of fifteen skilled
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+9 Services
13% Custom Web Application Development
5% API Development & Integration
8% CMS Development & Customization
5% Product UX Strategy
AI Summary
“Kashi Infotech offers comprehensive web development, digital marketing, and content writing services, delivering tailored, high-quality solutions to enhance clients' online presence efficiently and competitively.”
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Armdia Systems
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Armdia Systems is a software development consultancy located in the UK, focusing on bespoke application development, artificial intelligence, data engineering, and enterprise software integration. We collaborate with startups, small and medium-sized enterprises, and large organizations to create, de
Highlights
2-9
Employees
Services Provided+24 Services
6% Custom Web Application Development
3% QA & Software Testing
4% Legacy System Modernization
3% Code Review & Technical Audits
AI Summary
“Armdia Systems is a UK-based software consultancy specializing in bespoke application development, AI integration, data engineering, enterprise solutions, and cloud infrastructure for diverse clientele.”
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Webly Tech
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Webley Technologies is a consulting firm specializing in digital innovation and technology, offering AI-based solutions, cloud services, and tailored software development for contemporary businesses. We focus on modernizing legacy systems, migrating to the cloud, and creating Generative AI solutions
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Noida, Uttar Pradesh, In
Services Provided+12 Services
8% Custom Web Application Development
5% API Development & Integration
4% E-Commerce Development
3% Mobile App Development (iOS & Android)
AI Summary
“Webley Technologies delivers consulting in digital innovation, offering AI-driven solutions, cloud migration, and custom software development to modernize businesses and drive measurable growth.”
HexaPaul
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Hexapaul specializes in creating cross-platform applications, web applications, websites, database design, social media solutions, game development, and projects involving blockchain, machine learning, artificial intelligence, virtual reality, and augmented reality, among others. We cater to busines
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
New Delhi, Delhi, In
Services Provided+50 Services
5% Mobile App Development (iOS & Android)
5% Custom Web Application Development
2% API Development & Integration
1% E-Commerce Development
AI Summary
“HexaPaul offers comprehensive software development including cross-platform apps, AI, blockchain, and advanced security solutions, supporting diverse businesses in digital transformation across industries.”
Simplisive Solutions
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Simplisive Solutions LLP is a specialized technology consultancy and Microsoft Authorized Partner, focusing on comprehensive digital solutions. Our areas of expertise include: Full Stack Development, where we create scalable enterprise-level applications using contemporary frameworks; Web & Mobile D
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
10% Mobile App Development (iOS & Android)
14% Custom Web Application Development
8% QA & Software Testing
2% API Development & Integration
AI Summary
“Simplisive Solutions LLP is a Microsoft partner offering full stack, web, mobile development, and AI-driven QA testing, delivering scalable digital solutions with strategic branding and compliance expertise.”
Naitech
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Naitech focuses on developing web systems, building websites, engaging in digital marketing, and crafting customized online stores.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
14% Custom Web Application Development
7% API Development & Integration
10% E-Commerce Development
3% CMS Development & Customization
AI Summary
“Naitech specializes in web development, digital marketing, and customized e-commerce solutions, delivering tailored online platforms and marketing strategies to enhance clients' digital presence.”
ZappinZY
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Zappinzy Technologies was established with the aim of connecting intricate technology with business requirements. Initially a small group of enthusiastic developers, we have evolved into a comprehensive digital agency with a global presence. We specialize in creating scalable, user-focused digital s
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+8 Services
5% Custom Web Application Development
5% Mobile App Development (iOS & Android)
4% API Development & Integration
4% Backend Development
AI Summary
“Zappinzy Technologies is a global digital agency delivering scalable web and mobile solutions with expertise in development, design, and support, serving diverse industries for over five years.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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