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

Web Berserker Michał Sobczak
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Michał Sobczak is a Certified PrestaShop Expert and Senior Backend Developer with over a decade of experience in high-performance e-commerce. Unlike traditional agencies that focus on basic setups, "Web Berserker" is dedicated to addressing intricate architectural issues, critical performance obstac
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
Poznan, Greater Poland, Pl
Services Provided
50% E-Commerce Development
35% Custom Web Application Development
15% API Development & Integration
AI Summary
“Web Berserker Michał Sobczak delivers expert e-commerce software solutions with advanced migrations, performance optimization, and custom Symfony-based development, specializing in complex backend integrations and system stability.”
Sarvadhi Solutions Private Limited
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Sarvadhi Solutions is a leading software development firm that provides customized IT services and solutions aimed at enhancing business success. With more than ten years of experience in the industry, 150 satisfied clients, and over 467 successful projects, we focus on creating innovative and perso
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Surat, Gujarat, In
Services Provided+2 Services
8% Mobile App Development (iOS & Android)
10% API Development & Integration
5% ERP & CRM Development
5% E-Commerce Development
AI Summary
“Sarvadhi Solutions delivers customized IT and web solutions, leveraging over a decade's expertise and innovative methodologies to enhance business efficiency across diverse industries.”
XSoft
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X-Soft is a reliable technology partner offering tailored web and mobile solutions for startups, enterprises, and expanding businesses around the globe. With over ten years of experience, we have assisted clients across various sectors—including hospitality, e-commerce, fintech, HR tech, and SaaS—in
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Yerevan, Am
Services Provided+1 Services
18% Custom Web Application Development
10% API Development & Integration
15% Mobile App Development (iOS & Android)
7% SaaS Product Development
AI Summary
“XSoft delivers tailored web, mobile, SaaS, and cloud-native solutions with expertise in software development and IT infrastructure, supporting scalable, high-performing digital products globally.”
Gluo
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We are an eCommerce agency with more than 20 years of experience in the industry. We set up eCommerce platforms, payment systems, search technologies, content management systems, ERPs, and CRMs. Furthermore, we build new commerce features from the ground up. Our expertise lies in Headless and Compos
Highlights
$75,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Granada, Miguel Hidalgo, Mx
Services Provided
43% E-Commerce Development
7% API Development & Integration
50% Product UX Strategy
AI Summary
“Gluo is a seasoned eCommerce agency specializing in Headless and Composable Commerce, offering platform setup, payment integration, and scalable, adaptable store solutions to enhance user experience.”
Forrentech
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Forrentech is a development agency specializing in web and mobile applications, aiming to be the ultimate tech partner for businesses of all sizes. With proficiency in areas such as eCommerce, PropTech (Real Estate Technology), HealthTech, FinTech, SaaS, and more, we deliver all-inclusive digital so
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Lahore, Pk Punjab, Pk
Services Provided+1 Services
18% Custom Web Application Development
15% Mobile App Development (iOS & Android)
10% API Development & Integration
7% E-Commerce Development
AI Summary
“Forrentech is a development agency delivering comprehensive web and mobile applications across industries, leveraging custom and no-code solutions to accelerate business growth and digital innovation.”
ioauto
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At ioauto, we believe in achieving growth through smarter methods rather than harder work. We are a contemporary automation agency dedicated to helping businesses of all sizes enhance their operations, scalability, and customer engagement. Whether you’re a startup, a solo entrepreneur, an agency, or
Highlights
2-9
Employees
Gdansk, Pomeranian, Pl
Services Provided+1 Services
10% AI Strategy & Roadmap Consulting
5% LLM Integration & Prompt Engineering
35% CRM Consulting and SI
20% API Development & Integration
AI Summary
“ioauto is a modern automation agency delivering customized digital solutions, including app development, automation, and SEO strategies, to enhance business efficiency, scalability, and measurable growth.”
Sanatel Consulting
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The Sanatel team consists of highly skilled IT professionals who have extensive experience in the Enterprise sector. They have successfully executed projects focused on sales automation and customer engagement, which include automating contact centers, implementing chats and chatbots, and deploying
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Almaty, Almaty City, Kz
Services Provided
20% API Development & Integration
30% Custom Web Application Development
18% AI Agent & Multi-Agent System Development
32% LLM Integration & Prompt Engineering
AI Summary
“Sanatel Consulting comprises skilled IT professionals delivering enterprise sales automation, customer engagement, speech analytics, private AI solutions, and Angular-based software development services.”
DEPCORE
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DEPCORE is a web design and development team located in Poland, focusing on website, web application, and e-commerce solutions. We are enthusiastic about technologies such as WordPress, WooCommerce, and OctoberCMS, and boast over 15 years of practical experience. Our tight-knit team collaborates to
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Opole, Opole, Pl
Services Provided
20% API Development & Integration
30% Mobile App Development (iOS & Android)
18% Product UX Strategy
32% Web App UI Design
AI Summary
“DEPCORE is a Poland-based web design and development team with over 15 years' experience, specializing in websites, web applications, and e-commerce using WordPress, WooCommerce, and OctoberCMS.”
Laravel India
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At Laravel India, we are a devoted group of enthusiastic Laravel developers dedicated to making your digital aspirations a reality. With extensive expertise in the Laravel framework, we focus on creating custom web applications and solutions that are both visually appealing and highly efficient. We
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
250-999
Employees
Services Provided
60% Custom Web Application Development
10% Mobile App Development (iOS & Android)
20% API Development & Integration
10% E-Commerce Development
AI Summary
“Laravel India specializes in developing custom, efficient, and visually appealing web applications using Laravel framework, transforming creative ideas into tailored, user-friendly digital solutions for clients.”
A&S Technologies
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We introduce innovative ideas and creative strategies to enhance our clients' business quality. Our highly skilled designers and developers consistently strive to deliver the best results for our clients. We don’t just conduct business; we consider our clients as family and are committed to helping
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Bengaluru, Karnataka, In
Services Provided
30% Mobile App Development (iOS & Android)
40% Custom Web Application Development
20% API Development & Integration
10% E-Commerce Development
AI Summary
“A&S Technologies delivers innovative design and development solutions with a client-focused approach, dedicated to enhancing business quality and fostering long-term growth partnerships.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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