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

Black Antelope
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Founded in 2009, Black Antelope is a digital creative agency that specializes in intricate, high-impact projects. We create tailored digital platforms that emphasize performance, accessibility, and long-term sustainability. Operating out of Seattle and Sacramento, we collaborate with organizations s
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Edmonds, Washington, Us
Services Provided+2 Services
18% Custom Web Application Development
5% E-Commerce Development
12% API Development & Integration
15% CMS Development & Customization
AI Summary
“Black Antelope is a Seattle-based digital agency delivering tailored, high-impact CMS platforms and custom web applications, emphasizing accessibility, complex integrations, and scalable solutions for diverse sectors.”
Codexia Technologies
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Codexia employs an effective development strategy to provide our customers with the best possible experience. We create and deliver advanced, innovative solutions tailored to your requirements, enabling you to transform your business. As software development outsourcing emerges as a strategic and co
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Lahore, Pk Punjab, Pk
Services Provided+2 Services
15% Mobile App Development (iOS & Android)
18% Custom Web Application Development
12% API Development & Integration
5% E-Commerce Development
AI Summary
“Codexia Technologies delivers innovative, tailored software development and outsourcing solutions, supporting businesses from startups to multinationals with comprehensive digital services and strategic partnerships.”
Cloudenx Consulting
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Cloudenx is a consulting and development company based in Noida, specializing in web, enterprise, and mobile solutions on Salesforce.com. At Cloudenx, our mission is to "Unlock Our Customers' Business Potential." By "unlock," we refer to the transformation of our clients' industry-specific challeng
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% API Development & Integration
30% Custom Web Application Development
35% CRM Consulting and SI
15% Cloud Consulting & SI
AI Summary
“Cloudenx Consulting in Noida specializes in Salesforce-based web, mobile, and enterprise solutions, driving digital transformation through tailored cloud and data analytics to enhance business growth and efficiency.”
HyperSense Software
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HyperSense creates tailored AI agents designed for real-world applications rather than demonstrations. Established in 2003, our team of over 40 is based in Bucharest, with an additional office in Chicago. We deliver AI solutions for regulated sectors including insurance, logistics, fintech, proptech
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Schaumburg, Illinois, Us
Services Provided+7 Services
3% Mobile App Development (iOS & Android)
12% Custom Web Application Development
13% API Development & Integration
5% E-Commerce Development
AI Summary
“HyperSense Software delivers customized AI agents for regulated industries, integrating advanced reasoning with deterministic validation to optimize workflows, ensure compliance, and provide scalable, secure solutions.”
Zuzze
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Zuzze is a design and development studio focused on user-centered approaches, connecting design with development. The studio assists ambitious startups, product teams, and founders in rapidly creating meaningful and engaging user experiences by integrating Computer Science (technical aspects), Human
Highlights
$100-149/hr
Avg Hourly Rate
Cham, Zug, Ch
Services Provided+1 Services
20% API Development & Integration
30% Mobile App Development (iOS & Android)
20% Product UX Strategy
15% Mobile App UI Design
AI Summary
“Zuzze is a design and development studio blending technical expertise with user-centered design to create innovative 2D and 3D interfaces, serving startups and enterprises across industries.”
3mi Lab
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We are a group of skilled software developers, architects, and product owners collaborating with top companies to foster their growth through modernization and integration. Our methodology merges advanced technologies and industry best practices in software development with expert system integration
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Zagreb, Grad Zagreb, Hr
Services Provided+1 Services
12% Custom Web Application Development
15% API Development & Integration
7% Legacy System Modernization
33% Business Intelligence (BI) Dashboard Development
AI Summary
“3mi Lab is a team of expert software developers and architects collaborating with leading companies to drive growth through advanced modernization, integration, and strategic technology solutions.”
ZupeeSoft India
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ZupeeSoft India is a results-oriented software development firm located in Ahmedabad, Gujarat — the epicenter of India's vibrant tech scene. Our focus goes beyond merely creating software; we craft digital experiences that address genuine business challenges and drive sustainable growth. We collabor
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% Custom Web Application Development
20% API Development & Integration
15% E-Commerce Development
25% Mobile App Development (iOS & Android)
AI Summary
“ZupeeSoft India delivers tailored software, web and mobile apps, UI/UX design, and digital marketing solutions, emphasizing quality, collaboration, and measurable business outcomes.”
Tranarc
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Tranarc is a software engineering and product development firm that assists organizations in transforming complex ideas into dependable, secure, and scalable digital solutions. We collaborate with founders, growing companies, and institutions to provide comprehensive services that include discovery,
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Ibadan, Oyo, Ng
Services Provided+1 Services
20% API Development & Integration
14% Mobile App Development (iOS & Android)
20% Custom AI Chatbot Development
13% Generative AI
AI Summary
“Tranarc is a software engineering firm delivering secure, scalable digital solutions across web platforms, APIs, embedded systems, and cloud infrastructure, supporting businesses with comprehensive development and ongoing support.”
Shapert
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We provide CONSULTING services to help you pinpoint how technology can most significantly impact your business's growth. Our team examines processes, formulates strategies, and prioritizes scalable automation projects. We also handle IMPLEMENTATION. We don't just outline which initiatives to underta
Highlights
$10,000+
Min Project Size
$150+/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
20% Custom Web Application Development
8% Mobile App Development (iOS & Android)
15% API Development & Integration
7% E-Commerce Development
AI Summary
“Shapert offers expert consulting and implementation services, developing tailored technology strategies and solutions to drive scalable business growth and digital transformation since 2010.”
Millennial Projects
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We create effective websites and provide dependable hosting solutions. Our aim is to help businesses of all sizes build a robust online presence and reach their digital objectives.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% Custom Web Application Development
20% API Development & Integration
30% E-Commerce Development
AI Summary
“Millennial Projects develops efficient websites and reliable hosting services, supporting businesses in establishing a strong online presence and achieving digital goals effectively.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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