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

Basad
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ASAD Studios is a software engineering company located in Prague, Czech Republic. We develop web applications, business systems, and tailored software for organizations seeking dependable, production-ready solutions rather than generic templates or off-the-shelf products. Our team operates across th
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Prague, Cz
Services Provided+1 Services
30% Custom Web Application Development
5% Mobile App Development (iOS & Android)
20% API Development & Integration
25% SaaS Product Development
AI Summary
“Basad, based in Prague, delivers custom web applications and business systems using modern technologies, specializing in full lifecycle development and AI-driven tools, focusing on efficiency and client collaboration.”
Yumeus Technologies
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Yumeus Technologies is an IT services and consulting firm that focuses on custom software development, blockchain and Web3 solutions, FinTech applications, CRM systems, and eCommerce platforms. We assist businesses in creating secure, scalable, and high-performance digital products, guiding them fro
Highlights
$1,000+
Min Project Size
10-49
Employees
Services Provided+1 Services
13% API Development & Integration
20% Custom Web Application Development
12% Mobile App Development (iOS & Android)
5% QA & Software Testing
AI Summary
“Yumeus Technologies delivers tailored IT services, specializing in custom software, blockchain, FinTech, CRM, and eCommerce, ensuring secure, scalable, and user-focused digital solutions from conception to deployment.”
EltexSoft
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At EltexSoft, we create tailored software solutions and enhance the capabilities of existing engineering teams for startups and renowned companies, including those in the Fortune 500 and INC 5000. Our key areas of expertise include: • Sports, Health & Wellness, and Longevity (web and mobile platform
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Burbank, California, Us
Services Provided+4 Services
13% API Development & Integration
23% Custom Web Application Development
15% Mobile App Development (iOS & Android)
20% Generative AI
AI Summary
“EltexSoft delivers tailored software solutions across diverse industries, leveraging skilled engineers and best practices to enhance teams, ensure quality, and maximize business value with timely delivery.”
FUF Digital
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FUF is a digital agency located in Austin, drawing on thirty years of enterprise engineering experience from Stuttgart, Germany. We develop Drupal platforms, tailor-made software, and AI-driven products that reflect the achievements of top brands and organizations in the digital sphere. Our goal is
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Austin, Texas, Us
Services Provided+3 Services
20% Custom Web Application Development
8% Mobile App Development (iOS & Android)
13% API Development & Integration
10% E-Commerce Development
AI Summary
“FUF Digital is an Austin-based digital agency with 30 years of engineering expertise, specializing in Drupal development, custom software, and AI-driven products for leading brands.”
Krootl
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Krootl is a comprehensive app development agency dedicated to providing digital solutions specifically for the healthcare, finance, wellness, and retail sectors. We specialize in designing, developing, and launching web and mobile applications tailored to meet business requirements and drive revenue
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kyiv, Ua
Services Provided
50% Mobile App Development (iOS & Android)
30% Custom Web Application Development
10% API Development & Integration
10% QA & Software Testing
AI Summary
“Krootl is a full-service app development agency focusing on healthcare, finance, wellness, and retail sectors, delivering tailored web and mobile solutions to drive business growth.”
Ansi ByteCode LLP
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Ansi Bytecode LLP is a software development firm headquartered in Ahmedabad, Gujarat, India, specializing in creating custom applications tailored to client needs with rapid delivery. With a robust team of developers averaging over 10 years of experience, the company has developed innovative solutio
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Ahmedabad, Gujarat, In
Services Provided+15 Services
4% Computer Vision Solutions
3% Robotic Process Automation (RPA)
4% Machine Learning Model Development
4% LLM Integration & Prompt Engineering
AI Summary
“Ansi Bytecode LLP, based in Ahmedabad, delivers custom software and AI-driven solutions worldwide, leveraging Microsoft technologies and extensive expertise in application development and advanced machine learning.”
Arktik Labs
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Arktik is a custom software development firm located in Indonesia. We assist startups and expanding businesses in creating web applications, mobile apps, backend systems, and AI-driven products. Our team functions as a dedicated extension of your workforce, rather than as rotating freelancers. Our e
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Id
Services Provided+1 Services
40% Software Development Services
20% API Development & Integration
20% Custom Web Application Development
10% Machine Learning Model Development
AI Summary
“Arktik Labs excels in Software Development, offering expert services in custom web applications, mobile app development, and API integration. Their portfolio includes MVPs and scalable enterprise backends, showcasing deep technical capabilities.”
TurtleTech ehf.
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TurtleTech ehf. offers European infrastructure solutions and specialized technical consulting from Reykjavik, Iceland. The company adheres to strict Icelandic and EU data protection regulations to safeguard client privacy and data sovereignty. Our services include managed offerings such as Zotero We
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% Engineering Services
30% Managed IT Services
20% Machine Learning Model Development
20% API Development & Integration
AI Summary
“TurtleTech ehf.'s API Development service showcases their software development capabilities, particularly in delivering specialized solutions for containerized application hosting and integration within high-performance computing workflows.”
Moonbound
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We are an agency dedicated to developing customized solutions for your business, enabling you to optimize processes and concentrate on your priorities. At Moonbound, we leverage AI agents and cutting-edge technology to create automations tailored to your requirements, whether you need a chatbot, a w
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Barcelona, Catalonia, Es
Services Provided
30% Custom Web Application Development
20% API Development & Integration
33% AI Agent & Multi-Agent System Development
17% Generative AI
AI Summary
“Moonbound is a technology agency that develops customized AI-driven automation solutions, including chatbots and integrated workflows, to optimize business processes and enhance operational efficiency.”
SriCoder
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Sricoder: Your Experts in Digital Solutions. Check us out at sricoder.com. Together, let’s create the future!
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
25% API Development & Integration
25% E-Commerce Development
25% Mobile App Development (iOS & Android)
25% Custom Web Application Development
AI Summary
“SriCoder specializes in Software Development, providing expertise in API Development, E-Commerce, Mobile App, and Web Development, aligning their offerings precisely with these key software solutions to serve varied client needs.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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