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

Techsila LLC
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Techsila LLC is a comprehensive IT consultancy and software development company located in Burlington, serving clients around the world. We specialize in creating scalable and intelligent solutions through AI, cloud technologies, and modern web development. Our primary services include: - **AI & M
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Burlington, Massachusetts, Us
Services Provided+16 Services
8% Custom Web Application Development
5% Backend Development
5% Frontend Development
1% Progressive Web App (PWA) Development
AI Summary
“Techsila LLC provides global IT consultancy and software development, specializing in AI, cloud, cybersecurity, web and mobile apps, UX, and SaaS with a focus on collaboration and innovation.”
Enlighten Designs
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Enlighten Designs Ltd is a celebrated leader in digital innovation, focusing on high-level website design, web application development, and transformative AI-driven solutions. Based in New Zealand, the company serves clients in New Zealand, the United States, Australia, and Canada. Enlighten Designs
Highlights
50-249
Employees
Hamilton, Waikato, Nz
Services Provided+17 Services
8% Custom Web Application Development
4% API Development & Integration
2% E-Commerce Development
3% Mobile App Development (iOS & Android)
AI Summary
“Enlighten Designs Ltd, based in New Zealand, specializes in AI-driven web design, app development, and data visualization, leveraging Microsoft technologies and unique Vibe Coding to deliver innovative digital solutions globally.”
Muzammil
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I am a professional software developer.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
Services Provided+2 Services
10% API Development & Integration
10% E-Commerce Development
13% Custom Web Application Development
17% AI Strategy & Roadmap Consulting
AI Summary
“Muzammil is a professional software developer with expertise in designing and implementing software solutions, emphasizing quality and efficiency across various applications and industries.”
Commerce9
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Established in 2019, Commerce9 has evolved into a full-service software solutions provider, enabling businesses around the globe to digitize, enhance efficiency, and expand. As an accredited partner of both Odoo and Shopify, we offer top-tier services in ERP Implementation, eCommerce Development, AI
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Dubai, Dubayy, Ae
Services Provided+9 Services
9% ERP & CRM Development
4% Backend Development
5% Mobile App Development (iOS & Android)
6% E-Commerce Development
AI Summary
“Commerce9 is a global software solutions provider offering ERP implementation, eCommerce development, AI/ML, mobile apps, cloud services, and digital marketing to enhance business efficiency and growth.”
HeadToNet
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HeadToNet is a consulting and engineering services company focused on leveraging data to help businesses maximize their digital and data investments. Established in 2023 and based in Miami, Florida, the company has experienced rapid growth by providing impactful solutions in areas such as data moder
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Miami, Florida, Us
Services Provided+15 Services
5% Custom Web Application Development
3% Legacy System Modernization
6% E-Commerce Development
5% ERP & CRM Development
AI Summary
“HeadToNet delivers comprehensive consulting and engineering services across data modernization, analytics, e-commerce, and marketing automation, enabling scalable, secure digital transformations focused on measurable business impact.”
Innovations for Business
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Innovations for Business (IFB) is a comprehensive IT firm that functions as a professional community of partners, all working towards a shared mission. We bring a wide range of ideas to fruition for established businesses and support startups at various stages of their development. Our primary focus
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kyiv, Ua
Services Provided+15 Services
4% Mobile App Development (iOS & Android)
3% Frontend Development
2% Legacy System Modernization
3% API Development & Integration
AI Summary
“Innovations for Business is an IT firm delivering consulting, digital transformation, and web/mobile solutions across FinTech, logistics, and startups, employing Agile and Lean methodologies to drive business growth.”
Engine Ai
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Engine AI links global AI advancements with Oman’s infrastructure and regulatory framework, ranging from pilot projects to national platforms.
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
3% Robotic Process Automation (RPA)
10% Custom AI Chatbot Development
20% Generative AI
14% Content Moderation Services
AI Summary
“Engine AI integrates global artificial intelligence innovations within Oman's infrastructure and regulations, facilitating projects from pilot phases to nationwide AI platforms.”
Sirgil Technology
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We focus on assisting businesses in effectively planning and launching digital products. Our devoted team of developers and project managers pays close attention to every detail to guarantee the success of your projects.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
15% Custom Web Application Development
15% Mobile App Development (iOS & Android)
4% API Development & Integration
33% BI & Big Data Consulting & SI
AI Summary
“Sirgil Technology specializes in aiding businesses to successfully plan and launch digital products through dedicated development and project management with meticulous attention to detail.”
Communicadence India
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Communicadence India is a company that specializes in custom software and web application development, with the ability to utilize various technology platforms to support and enhance your business strategies.
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided+17 Services
10% Custom Web Application Development
3% Blockchain & Web3 Development
4% API Development & Integration
3% QA & Software Testing
AI Summary
“Communicadence India specializes in custom software and web application development, leveraging diverse technologies to support and enhance business strategies effectively.”
Algowrite
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Algowrite is a remote agency specializing in software and AI automation, designed for small and medium-sized businesses (SMBs) and budding enterprises in the USA, UK, and Europe that want to move away from manual operations. We create systems that reduce the workload your team shouldn’t handle—autom
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
8% E-Commerce Development
8% Mobile App Development (iOS & Android)
7% API Development & Integration
10% Custom Web Application Development
AI Summary
“Algowrite is a remote agency delivering custom software, AI automation, and scalable systems for SMBs and startups across the USA, UK, and Europe, enhancing efficiency and growth with fixed-price projects.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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