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

Altos Engineering
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We focus on creating and developing user-friendly websites, cutting-edge apps, and comprehensive software solutions customized to meet your specific business requirements.
Highlights
$50-99/hr
Avg Hourly Rate
2-9
Employees
Ee
Services Provided+10 Services
10% BI & Big Data Consulting & SI
10% Software Development Services
10% DevOps Engineering
10% Other IT Consulting and SI
AI Summary
“Altos Engineering specializes in developing user-friendly websites, innovative apps, and tailored software solutions designed to fulfill diverse business needs efficiently and effectively.”
Pandascode
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Established in 2020, PandasCode is a cutting-edge web and app development agency that boasts some of the leading Flutter and Mobile Developers globally. Since entering the market, we have transformed business opportunities by providing top-notch, contemporary web and mobile applications. Our mission
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
20% Custom Web Application Development
25% Mobile App Development (iOS & Android)
5% API Development & Integration
25% Product UX Strategy
AI Summary
“Founded in 2020, PandasCode specializes in advanced web and mobile app development, leveraging expert Flutter developers to deliver efficient, innovative solutions for businesses and startups worldwide.”
CODE STEW
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We utilize all leading technology stacks, covering both front-end and back-end development. Our hourly rates for project-based work range from $15 to $25, and hiring full-time developers can offer even lower costs, often leading to savings of around 70%. We collaborate closely with you, the ideal in
Highlights
$25,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+12 Services
8% Custom Web Application Development
5% API Development & Integration
5% Backend Development
5% Frontend Development
AI Summary
“CODE STEW offers comprehensive front-end and back-end development using leading technologies, delivering cost-effective solutions with expert support to maximize SEO and PPC campaign success across B2B and B2C markets.”
Upstack Web
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We Offer Tailored Services At Upstack, we take pride in delivering adaptable IT solutions that meet your unique needs. Our flexible strategy allows us to modify our services to match your changing requirements, whether you need full IT infrastructure support, strategic consulting, or software develo
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+8 Services
11% Custom Web Application Development
6% E-Commerce Development
5% API Development & Integration
3% Mobile App Development (iOS & Android)
AI Summary
“Upstack Web provides flexible IT solutions including infrastructure support, strategic consulting, and software development, tailored to meet diverse and evolving client needs professionally.”
Appsnado
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Do you have an app idea that you're excited to turn into a thriving business? Look no further than Appsnado. Based in New Jersey, we are a software development company committed to transforming your concept into reality. Our skilled team offers tailored solutions to fulfill your app requirements, gu
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Services Provided+9 Services
13% Mobile App Development (iOS & Android)
5% Custom Web Application Development
3% API Development & Integration
2% E-Commerce Development
AI Summary
“Appsnado, a New Jersey-based software development company, offers tailored app solutions from concept to launch, emphasizing transparency, competitive analysis, and data-driven design for successful digital transformation.”
Slash Technologies
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Slash Technologies provides a range of digital and IT services, specializing in comprehensive website design and development. Our offerings include logo, UI, banner, and flyer design, as well as app development for Android and iOS. We also focus on backend development, including admin panels and API
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Indore, Madhya Pradesh, In
Services Provided+17 Services
4% Custom Web Application Development
3% Blockchain & Web3 Development
3% API Development & Integration
3% ERP & CRM Development
AI Summary
“Slash Technologies delivers comprehensive digital solutions, including website and app development, blockchain services, software development, and digital marketing across diverse industries.”
nuSoft, Inc.
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**Award-Winning Customized Software Development for B2B & B2C** **nuSoft: Pioneering Digital Solutions with a Global Reach** With a reputation founded on excellence and innovation, nuSoft stands as a leading technology service provider, offering state-of-the-art solutions that revolutionize busi
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+12 Services
9% Mobile App Development (iOS & Android)
8% Backend Development
6% Custom Web Application Development
2% API Development & Integration
AI Summary
“nuSoft, Inc. specializes in customized software development, cloud infrastructure, data analytics, AI, and web solutions, delivering innovative digital services globally with a strong client retention record.”
Infonium Technologies
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We are a results-oriented information technology consulting firm focused on assisting companies with our extensive expertise in modern technologies and business frameworks. At Infonium, we collaborate with businesses to provide customized IT consulting services. Acting as a business partner, we supp
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Bengaluru, Karnataka, In
Services Provided+25 Services
1% Frontend Development
3% API Development & Integration
3% Custom Web Application Development
1% Mobile App Development (iOS & Android)
AI Summary
“Infonium Technologies delivers tailored IT consulting and digital transformation services, leveraging 20+ years' expertise to enhance business processes across diverse industries effectively and reliably.”
K26 Technologies
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K26 Technologies is a globally recognized company in the field of Internet Solution Providers. Based in India, we are among the top Web Development, Mobile Application Development, and Web Design firms. Our expertise spans various areas, including Travel Portals, Event Management, Transportation & L
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+9 Services
13% Custom Web Application Development
5% API Development & Integration
8% Mobile App Development (iOS & Android)
6% Landing Page Design
AI Summary
“K26 Technologies delivers comprehensive software, UI/UX, branding, and digital marketing solutions across various industries, leveraging advanced technologies to enhance client business processes and online presence.”
Technology Xtend
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Technology Xtend is your comprehensive provider for website and mobile app development, software solutions, Social Media Optimization (SMO), Search Engine Optimization (SEO), Pay-Per-Click (PPC) advertising, and WhatsApp automation services. Our team of technology enthusiasts is committed to support
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Services Provided+9 Services
8% Custom Web Application Development
8% Mobile App Development (iOS & Android)
5% API Development & Integration
3% E-Commerce Development
AI Summary
“Technology Xtend delivers tailored website, app development, and comprehensive digital marketing services including SEO, SMO, PPC, and automation to enhance business growth and online visibility.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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