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

Sascha Thiel SoftpageHomeware
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In the rapidly evolving business landscape of today, enhancing efficiency and productivity is crucial for any organization aiming to thrive and increase profitability. This is where my skills as an automation specialist prove vital. I focus on helping businesses simplify their processes by automatin
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Munich, Bavaria, De
Services Provided
70% Custom Web Application Development
30% API Development & Integration
AI Summary
“Sascha Thiel SoftpageHomeware specializes in automating business processes to enhance efficiency and productivity, enabling organizations to focus on growth and achieve competitive advantages.”
ZAIM DIGITAL
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LABCORP LIMS is a Laboratory Information Management System created by Zaim Digital, a software development firm based in Morocco. Tailored for laboratories that test construction materials, it manages the complete process from receiving samples and overseeing tests to generating reports, invoicing,
Highlights
$10,000+
Min Project Size
2-9
Employees
Casablanca, Ma
Services Provided
65% Custom Web Application Development
35% API Development & Integration
AI Summary
“Zaim Digital, a Moroccan software firm, develops LABCORP LIMS, a comprehensive laboratory management system ensuring digital workflow, traceability, compliance, and reporting aligned with ISO/IEC 17025 standards.”
Blue Dragon SRL
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We are a company with nine years of experience in software development. We follow industry standards while offering competitive pricing and employ skilled professionals. Our focus is on delivering solutions rather than just products.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Lambare, Py
Services Provided
40% API Development & Integration
35% Mobile App Development (iOS & Android)
25% E-Commerce Development
AI Summary
“Blue Dragon SRL leverages nine years of software development expertise and skilled professionals to deliver industry-standard, solution-focused services with competitive pricing.”
Sdaemon Infotech Pvt Ltd
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At Sdaemon, we focus on developing innovative software solutions that enhance business success. Our team of talented developers and technology specialists is dedicated to bringing your ideas to life through tailored software, strategic advice, and exceptional support. Discover how we can assist you
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Pune, Maharashtra, In
Services Provided
40% API Development & Integration
30% E-Commerce Development
30% Mobile App Development (iOS & Android)
AI Summary
“Sdaemon Infotech Pvt Ltd specializes in innovative software development, delivering customized solutions, strategic guidance, and dedicated support to empower businesses in the digital landscape.”
E
EmailBison
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EmailBison is a top-tier private email sequencing solution designed for agencies and go-to-market teams operating at scale. With its isolated, single-tenant structure, dedicated IP addresses, and virtual private networks, EmailBison effectively prevents noisy-neighbor issues and enhances deliverabil
Highlights
2-9
Employees
Services Provided
30% Custom Web Application Development
45% API Development & Integration
25% SaaS Product Development
AI Summary
“EmailBison offers a scalable, private email sequencing platform with advanced deliverability features, unlimited team collaboration, robust integrations, A/B testing, and dedicated support for agencies and GTM teams.”
EthicCode Technologies
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EthicCode Technologies is a specialized engineering firm that creates advanced automation systems, bespoke software, and industrial IoT solutions. We focus on crafting systems that integrate effortlessly into current workflows as if they have always been part of your operations. Our team has over fi
Highlights
$1,000+
Min Project Size
2-9
Employees
Services Provided
40% API Development & Integration
45% Custom Web Application Development
15% Mobile App Development (iOS & Android)
AI Summary
“EthicCode Technologies specializes in engineering advanced automation, bespoke software, and IoT solutions across industries, delivering scalable, integration-ready systems that enhance operational efficiency and transparency.”
Melonbyte
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Have an exciting concept? Let’s create an amazing app together! Melonbyte is a specialized web development firm located in Bucharest, Romania. We prioritize quality, honesty, transparency, and integrity in all that we do. Our offerings include: 🚀 SaaS Solutions 👨‍💻 Laravel & VueJS Development 🛒
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Bucuresti, Bucuresti, Ro
Services Provided
50% Custom Web Application Development
30% API Development & Integration
20% Mobile App Development (iOS & Android)
AI Summary
“Melonbyte, based in Bucharest, Romania, specializes in custom web and mobile app development, offering SaaS solutions, e-commerce, automation, and API integration with a focus on quality and integrity.”
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Michael W. Belt
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I am a software engineer with more than 25 years of experience in creating scalable and high-performance websites. My interests lie in development using technologies like PHP, Python, Perl, MySQL, Oracle, and Apache. For a decade, I was the Co-founder and CTO of Sickweather, Inc., where I oversaw th
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
Cockeysville, Maryland, Us
Services Provided
45% Custom Web Application Development
40% API Development & Integration
15% Backend Development
AI Summary
“Michael W. Belt is a seasoned software engineer with over 25 years' experience in scalable web development, API design, and data infrastructure across diverse industries and projects.”
HalSoft
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At HalSoft, we enable businesses to leverage technology effectively. We specialize in creating custom software solutions that optimize operations, improve user experiences, and generate measurable results. Located in Lviv, Ukraine, our team consists of talented engineers and product-focused experts
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
35% API Development & Integration
35% Software Development Services
30% Custom Web Application Development
AI Summary
“HalSoft specializes in custom software, e-commerce, and SaaS solutions, delivering client-focused, scalable digital platforms that streamline operations and enhance user experiences globally.”
SyrTech
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Hello! I'm a .NET Developer specializing in building functional applications. During my spare time, I enjoy working on personal projects, which allows me to express my creativity. Interested in seeing my work? Take a look at my portfolio: https://syrtech.pl/. I'm on the lookout for exciting challeng
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
Services Provided
50% Custom Web Application Development
40% API Development & Integration
10% Mobile App Development (iOS & Android)
AI Summary
“SyrTech specializes in developing functional .NET applications, showcasing creativity through personal projects and seeking innovative opportunities to deliver tailored software solutions.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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