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

INSITE GURU
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The A team provides services in software, web development, design, and IT as part of our "Build Better Businesses" strategy, catering to both B2B (Business to Business) and B2C (Business to Consumer) needs. Our innovative branding and marketing initiatives utilize advanced channels such as video str
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Durham, North Carolina, Us
Services Provided+1 Services
20% API Development & Integration
30% Mobile App Development (iOS & Android)
25% Web App UI Design
18% Product UX Strategy
AI Summary
“INSITE GURU excels in software, web, mobile development, IT services, and innovative marketing, serving diverse clients from small businesses to Fortune 500 companies globally.”
Webseller Software Solutions
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At WebSeller Software Solutions, we develop advanced, high-performance web platforms that leverage modern frameworks alongside AI capabilities. Our skills encompass Next.js for top-notch front-end development, Node.js and Supabase for strong back-end solutions, MySQL/MongoDB for effective data manag
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
20% API Development & Integration
14% Mobile App Development (iOS & Android)
33% Managed IT Services
33% Custom AI Chatbot Development
AI Summary
“WebSeller Software Solutions specializes in developing scalable, AI-driven web platforms using technologies like Next.js, Node.js, and Python, delivering innovative software for startups and enterprises.”
wpthrill
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At WPThrill, we specialize in high-performance WordPress development, supporting businesses, startups, and agencies in building, scaling, and securing their online presence. With more than ten years of experience, our team has provided premium plugins, customized themes, and 24/7 emergency WordPress
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% API Development & Integration
14% Custom Web Application Development
33% Search Engine Optimization (SEO)
33% IT Staff Augmentation
AI Summary
“WPThrill delivers expert WordPress development and support worldwide, offering custom plugins, themes, WooCommerce optimization, security, and 24/7 maintenance to enhance site performance and reliability.”
Breelink LLC
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Alpha Messaging Platform is a robust SMS switch designed specifically for the international A2P SMS market. It comes equipped with various features, including protocol support, API access, automatic rate uploads, multiple routing options, troubleshooting tools, and comprehensive analytical reports.
Highlights
10-49
Employees
Services Provided
14% Custom Web Application Development
20% API Development & Integration
33% SMS Marketing
33% Operational Process Consulting
AI Summary
“Breelink LLC develops Alpha Messaging Platform, a secure, feature-rich SMS switch tailored for global A2P messaging, offering protocol support, flexible routing, analytics, and reliable API integration.”
Codefacture
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Codefacture focuses on creating tailor-made software solutions that foster innovation and improve operational efficiency. With an emphasis on CRM and ERP applications, they help businesses optimize their processes and boost productivity. Their skilled developers and project managers are devoted to c
Highlights
2-9
Employees
Services Provided
18% API Development & Integration
32% Custom Web Application Development
28% ERP Consulting and SI
22% CRM Consulting and SI
AI Summary
“Codefacture develops custom CRM and ERP software solutions to enhance operational efficiency, supporting business growth through scalable, innovative, and client-focused technology services.”
Burncode
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1. Innovation at the Heart The company emphasizes the importance of advanced technologies and inventive approaches. They see themselves as an "innovation partner," going beyond mere software development to create solutions that offer real business benefits and ready-to-launch products. 2. Quality-
Highlights
$10,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Baku, Baki, Az
Services Provided+4 Services
20% API Development & Integration
25% Backend Development
5% Code Review & Technical Audits
13% Cloud Consulting & SI
AI Summary
“BurnCode delivers innovative, high-quality software solutions emphasizing security, reliability, and client collaboration to drive measurable business value and sustainable growth for startups and SMEs.”
Kokomo24/7®
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Kokomo24/7® offers the most extensive platform available in the health, safety, and operations sector, assisting organizations in streamlining their processes, enhancing efficiency, and minimizing both risk and expenses. Many organizations face challenges with disjointed solutions and find it diffic
Highlights
$150+/hr
Avg Hourly Rate
50-249
Employees
Northbrook, Illinois, Us
Services Provided+4 Services
20% API Development & Integration
14% Custom Web Application Development
3% CRM Consulting and SI
17% Cloud Consulting & SI
AI Summary
“Kokomo24/7® provides a comprehensive, evolving platform for health, safety, and operations that streamlines processes, reduces risks and costs, and integrates diverse organizational needs efficiently.”
021 lab sp. z o.o.
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Software: Our team of designers and developers assists clients in the conceptualization and planning stages to produce software tailored to their specific requirements. Hardware: We provide support for product development, from electronic prototyping to tooling, leveraging mechanical and electroni
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Krakow, Lesser Poland, Pl
Services Provided+1 Services
20% API Development & Integration
13% Mobile App Development (iOS & Android)
22% Mobile App UI Design
12% UX Research & Usability Testing
AI Summary
“021 lab sp. z o.o. is a technology company specializing in innovative solutions, delivering advanced software and laboratory services to a diverse client base across industries.”
Output42
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Output42, a consultancy specializing in aviation software, offers a diverse array of solutions and services. These include application and product development, software system integration, and data migration. The company boasts a team of developers and consultants with deep expertise in the airline
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
15% Custom Web Application Development
5% Mobile App Development (iOS & Android)
18% Legacy System Modernization
12% API Development & Integration
AI Summary
“Output42 is a consultancy specializing in aviation software, offering development, integration, migration, and support services with expertise in airline and MRO systems, including AMOS implementations.”
Nova X Solutions Limited
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Nova X Solutions is a tech company dedicated to developing interconnected systems that enable businesses to operate with clarity, efficiency, and long-term stability. We design digital ecosystems where tools, data, and workflows collaborate seamlessly, providing the framework companies need to expan
Highlights
$1,000+
Min Project Size
2-9
Employees
Abuja, Federal Capital Territory, Ng
Services Provided+1 Services
25% AI Strategy & Roadmap Consulting
25% Digital Strategy
25% Operational Process Consulting
16% API Development & Integration
AI Summary
“Nova X Solutions develops integrated digital ecosystems that streamline workflows and enhance business clarity, efficiency, and scalability through tailored technology and intelligent platform design.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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