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

DataOx
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At DataOx, we provide specialized web scraping services tailored to the specific needs of B2B companies across the globe. Our solutions assist organizations in the US, Europe, and Asia in obtaining trustworthy information, automating workflows, and making data-informed decisions that promote growth.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Tallinn, Harju, Ee
Services Provided
50% BI & Big Data Consulting & SI
50% API Development & Integration
AI Summary
“DataOx delivers customized web scraping, data processing, and integration services globally, enabling B2B companies across multiple sectors to automate workflows and make informed decisions.”
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TGL Solutions – DX Construction Partner in Southeast Asia
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TGL Solutions – Your Partner in DX Construction for Southeast Asia ⭐ Why Choose Us? With over 6 years of combined experience in DX Construction and a team of over 160 IT professionals, we possess in-depth knowledge of specialized areas within the construction industry. Our expertise includes CAD API
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Ho Chi Minh City, Vn
Services Provided
30% Custom Web Application Development
10% Mobile App Development (iOS & Android)
60% API Development & Integration
AI Summary
“TGL Solutions specializes in digital transformation for Southeast Asia's construction sector, offering BIM/CAD software development, workflow automation, CDE platforms, and field-data applications with certified expertise.”
Boon & Moil Limited
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We are a group of developers, software architects, and innovators dedicated to designing intuitive and forward-thinking products. In every project, we prioritize user-friendly design, empowering technology, and inspiring experiences.
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
York, England, Gb
Services Provided
60% API Development & Integration
40% Mobile App Development (iOS & Android)
AI Summary
“Boon & Moil Limited is a team of developers and architects committed to creating intuitive, user-friendly software products that empower technology and deliver innovative experiences.”
iorta Technology Solutions
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iorta Technology Solutions enables insurance and lending companies to leverage AI-powered automation, simplifying sales, operations, and claims management. Our solutions improve efficiency, transparency, and decision-making, allowing businesses to grow more rapidly and provide better service to thei
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Services Provided
60% API Development & Integration
30% Mobile App Development (iOS & Android)
10% Legacy System Modernization
AI Summary
“iorta Technology Solutions delivers AI-driven automation to enhance sales, operations, and claims workflows in insurance and lending, boosting efficiency and customer service in BFSI sectors.”
RHIA Connect Pvt Ltd
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RHIA Connect is a company specializing in engineering and technology solutions that emphasizes industrial automation, embedded systems, and IoT product creation. We assist startups, product firms, and industrial manufacturers in designing and developing smart electronic systems from initial concept
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
40% Custom Web Application Development
60% API Development & Integration
AI Summary
“RHIA Connect Pvt Ltd specializes in custom electronics, embedded systems, and industrial automation, delivering end-to-end IoT-enabled engineering solutions from concept to deployment for diverse industries.”
Uvili LLC
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At Uvili, we collaborate with a diverse array of clients, from major corporations to small startups, to assist them in reaching a variety of objectives, including introducing new products, improving current systems, and expanding operations. Our services encompass
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Cheyenne, Wyoming, Us
Services Provided
50% E-Commerce Development
50% API Development & Integration
AI Summary
“Uvili LLC partners with diverse clients, offering services to launch products, enhance systems, and support business expansion across various industries and company sizes.”
ZILLTECH
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**Zilltech Overview** Founded in 2018, Zilltech is a Zoho Premium Partner dedicated to enhancing businesses with Zoho CRM solutions that significantly improve operational efficiency. We work alongside successful companies and innovative brands across various industries, including real estate, heal
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
50% CRM Consulting and SI
50% API Development & Integration
AI Summary
“Zilltech, a Zoho Premium Partner since 2018, specializes in CRM solutions, automation, and integrated strategies to enhance operational efficiency and growth across diverse industries.”
up1
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At up1, we streamline your operations and create tailored APIs and services on AWS to address your most significant business challenges. We focus on delivering dependable and secure solutions that expand as your business grows, without any unnecessary details.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Services Provided
60% API Development & Integration
15% QA & Software Testing
25% Custom Web Application Development
AI Summary
“up1 specializes in developing tailored, secure AWS APIs and services that streamline operations and address critical business challenges, ensuring scalable, reliable solutions for growing enterprises.”
GRAN Software Solutions GmbH
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Was ist die größte Bedrohung für die Rentabilität und den Ruf einer IT-Agentur? Wenn ein Schlüsselentwickler zwei Wochen vor der Abgabe kündigt. Die hektische Suche nach verlässlichen Freelancern, der steigende Stress und das Risiko, das Vertrauen des Kunden zu verlieren – ich kenne dieses Szenario
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Berlin, Berlin, De
Services Provided
50% API Development & Integration
50% IT Staff Augmentation
AI Summary
“GRAN Software Solutions GmbH partners with IT agencies to provide vetted software experts on demand, enabling scalable team augmentation, efficient project delivery, and enhanced profitability.”
Crystalised Outsprint
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**About Us** At Crystalised Outsprint, we focus on delivering outstanding customer support and telemarketing services to companies of all sizes. Our goal is to assist businesses in enhancing their customer relationships, boosting sales, and reaching their goals through effective communication. Our
Highlights
< $25/hr
Avg Hourly Rate
50-249
Employees
Lusaka, Zm
Services Provided
50% API Development & Integration
50% Mobile App Development (iOS & Android)
AI Summary
“Crystalised Outsprint delivers customized customer support and telemarketing services from Zambia, enhancing business communication, sales, and client satisfaction with a commitment to excellence and innovation.”

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Top API Development & Integration Firms

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