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.

How this list is built

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

JZA Tech
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We focus on developing and enhancing top-notch, tailored websites for businesses and organizations of various scales. Our team of highly skilled and passionate developers is committed to creating mobile-friendly and user-friendly websites and applications, ensuring the highest quality software deliv
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
Services Provided+3 Services
5% API Development & Integration
10% Custom Web Application Development
9% Mobile App Development (iOS & Android)
1% E-Commerce Development
AI Summary
“JZA Tech specializes in creating customized, mobile-friendly websites and applications for diverse businesses, delivering high-quality, user-centric software through a dedicated team of skilled developers.”
Xekera Systems Inc.
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We specialize in handling your Business and Finance needs. Xekera Systems is a reliable partner for businesses ranging from small enterprises to Fortune 500 companies. We offer comprehensive, efficient solutions in electrical, mechanical, software, and firmware to assist our clients with digital dat
Highlights
250-999
Employees
Santa Clara, California, Us
Services Provided+8 Services
4% Custom Web Application Development
3% API Development & Integration
5% Backend Development
3% Frontend Development
AI Summary
“Xekera Systems Inc. delivers comprehensive business and finance solutions across electrical, mechanical, software, and firmware domains, supporting clients from small enterprises to Fortune 500 firms.”
H
HireWebDeveloper
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Employ a Web Developer
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Lviv, Lviv, Ua
Services Provided+5 Services
15% Custom Web Application Development
10% API Development & Integration
8% E-Commerce Development
10% Mobile App Development (iOS & Android)
AI Summary
“HireWebDeveloper specializes in connecting businesses with skilled web developers, offering tailored recruitment solutions to meet diverse project needs efficiently and professionally.”
devPlanet Software Solutions
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We offer the best solutions for your concepts. Bring your ideal app to life in three easy steps: we turn ideas into reality in just a few days!
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
7% API Development & Integration
18% Custom Web Application Development
5% E-Commerce Development
4% Mobile App Development (iOS & Android)
AI Summary
“devPlanet Software Solutions specializes in rapidly transforming client ideas into functional applications, delivering efficient, high-quality software solutions through a streamlined development process.”
Arexa Studio
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Arexa Studio - The Digital Benchmark for Outstanding Enterprises Arexa Studio creates high-quality websites, platforms, and digital systems for founders, operators, and organizations that understand their digital presence is integral to their business quality. We encompass the entire range of digit
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
20% Custom Web Application Development
15% Backend Development
10% Frontend Development
5% API Development & Integration
AI Summary
“Arexa Studio delivers high-quality digital solutions including websites, platforms, and integrated systems for global founders and organizations, emphasizing commercial objectives and long-term digital performance.”
Khawater Tech
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Khawater Tech is a boutique agency located in Jordan that specializes in creating high-performance, bilingual (Arabic/English) websites and e-commerce platforms for small and medium-sized businesses throughout the MENA region and beyond. We integrate contemporary UI/UX design, mobile-first developme
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Services Provided+3 Services
4% Mobile App Development (iOS & Android)
12% Custom Web Application Development
5% API Development & Integration
4% E-Commerce Development
AI Summary
“Khawater Tech, a Jordan-based boutique agency, delivers bilingual, high-performance websites and e-commerce solutions with SEO, mobile-first design, and ongoing support for MENA-region SMBs.”
Webloft
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We are a well-established digital agency based in Austria, specifically in Vienna and Graz, Styria. We possess a wealth of web expertise and focus on e-commerce, digital marketing, and blockchain technologies. Our range of in-house services includes: - Development of websites using TYPO3 and WordPre
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Gleisdorf, Styria, At
Services Provided+12 Services
13% Custom Web Application Development
10% E-Commerce Development
3% API Development & Integration
5% Product UX Strategy
AI Summary
“Webloft is an Austrian digital agency specializing in website and e-commerce development, blockchain applications, SEO, online advertising, social media marketing, and comprehensive digital training services.”
Coding Solution 24
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We turn concepts into reality through creative web solutions, mobile applications, and digital marketing tactics that promote business expansion.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Rahim Yar Khan, Pk Punjab, Pk
Services Provided+5 Services
5% API Development & Integration
8% Custom Web Application Development
7% Mobile App Development (iOS & Android)
20% DevOps Engineering
AI Summary
“Coding Solution 24 specializes in transforming ideas into innovative web and mobile applications, complemented by digital marketing strategies that enhance business growth and online presence.”
4Blocks Software Labs
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Welcome to 4Blocks, your comprehensive software partner for Web2 and Web3 advancements. Since our inception in 2020, we have successfully completed over 200 projects for both startups and established enterprises, combining extensive technical knowledge with precise execution. We assist you in bringi
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
San Zeno, Trentino South Tyrol, It
Services Provided+8 Services
5% Custom Web Application Development
4% API Development & Integration
4% Mobile App Development (iOS & Android)
4% E-Commerce Development
AI Summary
“4Blocks Software Labs delivers comprehensive software solutions in Web2 and Web3, specializing in scalable platforms, blockchain development, mobile apps, and product consulting for startups and enterprises.”
Genforge Studio
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GenForge Studio is a leading web and app development agency located in India. We focus on creating scalable SaaS platforms, e-commerce stores optimized for conversions, and custom software utilizing Next.js and React. Our mission is to assist startups and small to medium-sized enterprises in the US,
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
5% API Development & Integration
12% Custom Web Application Development
8% Mobile App Development (iOS & Android)
8% E-Commerce Development
AI Summary
“GenForge Studio, based in India, crafts scalable SaaS platforms, e-commerce sites, and custom software using Next.js and React, supporting startups and SMEs in global market growth.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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