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

Codetiv
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Jsme tým odborníků, kteří se nejen výborně orientují v kódu, ale také si skvěle rozumí navzájem. Dáváme do své práce maximum a podporujeme naše klienty v dosahování úspěchů v digitálním světě.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Services Provided
20% E-Commerce Development
60% Custom Web Application Development
20% API Development & Integration
AI Summary
“Codetiv is a skilled team of experts excelling in coding and collaboration, committed to delivering high-quality solutions that empower clients to succeed in the digital realm.”
BlueGateX Ltd
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BlueGateX is a software studio located in the UK that assists startups and small to medium-sized enterprises in conceptualizing, creating, and launching contemporary digital products. We specialize in developing cross-platform mobile applications using Flutter, responsive web apps, and tailored back
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Bradford, England, Gb
Services Provided+3 Services
13% API Development & Integration
13% Custom Web Application Development
25% Mobile App Development (iOS & Android)
17% Product UX Strategy
AI Summary
“BlueGateX Ltd. is a UK-based software studio specializing in cross-platform mobile apps, web applications, and back-end APIs, delivering user-focused, scalable digital products for startups and SMEs.”
M
mubaidr.org
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My name is Muhammad Ubaid Raza, and I am a Software Engineer with over 8 years of experience. I graduated in 2012 and earned my Master's degree in Project Management in 2019. I assist startups and entrepreneurs in contributing to society by developing software solutions.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Rawalpindi, Pk Punjab, Pk
Services Provided
20% API Development & Integration
30% Custom Web Application Development
50% Custom AI Chatbot Development
AI Summary
“Muhammad Ubaid Raza is a software engineer with over 8 years' experience, specializing in software development and project management to support startups and entrepreneurs in societal contributions.”
Vector Software Ltd
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Vector Software is a seasoned IT outsourcing firm that specializes in providing high-quality custom offshore development services. Founded in 2006, the company has rapidly expanded into a successful software development enterprise based in Oslo, Norway, with development centers located in Spain, Pol
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Oslo, Oslo, No
Services Provided+1 Services
13% API Development & Integration
5% Legacy System Modernization
25% Custom Web Application Development
7% Mobile App Development (iOS & Android)
AI Summary
“Vector Software Ltd. is a Norwegian IT outsourcing company offering high-quality custom offshore and nearshore software development services globally, with expertise in innovative, client-focused solutions.”
Uroboro | Web Design
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We are a web design agency dedicated to functionality, usability, and aesthetics. Our commitment has established Uroboro as a leader in the digital realm, consistently leading to the creation of unique, beautiful, and high-performing websites. As renowned experts in Webflow, there’s no unconventiona
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Levis, Quebec, Ca
Services Provided+4 Services
15% API Development & Integration
10% Custom Web Application Development
10% UX Research & Usability Testing
9% Product UX Strategy
AI Summary
“Uroboro | Web Design crafts functional, visually appealing websites with expert Webflow development, UX strategy, and comprehensive digital marketing, delivering tailored, high-performing digital solutions that boost client engagement and growth.”
AMPLIFIED ANALYTICS
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Amplified Analytics is a leader in speech analytics, specializing in customer experience/analytics, collections, and the BPO industry. Our capabilities are strengthened by our strategic use of CallMiner, recognized as the top analytics platform in the field. This collaboration allows us to provide h
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Ottawa, Ontario, Ca
Services Provided+1 Services
60% Customer Support Outsourcing
10% AI Strategy & Roadmap Consulting
10% API Development & Integration
10% Custom Development
AI Summary
“With expertise in API development and customized applications, AMPLIFIED ANALYTICS provides robust software solutions that integrate seamlessly with analytics platforms to optimize customer experience and operational efficiency.”
Shallowfeet Consulting
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Welcome to Shallowfeet, where innovative strategies converge with advanced technology. We specialize in Software Development, Mobile App Development, Cloud Solutions, and Serverless Development, utilizing tools like NodeJS, ReactJS, React Native, Amazon Web Services (AWS), and Google Cloud Platform
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Jaipur, Rajasthan, In
Services Provided
13% API Development & Integration
20% Custom Web Application Development
17% Mobile App Development (iOS & Android)
50% Cloud Consulting & SI
AI Summary
“Shallowfeet Consulting delivers innovative, scalable software, mobile apps, cloud, and serverless solutions leveraging NodeJS, React, AWS, and GCP to meet diverse business needs efficiently.”
HES Fintech
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HES FinTech offers cutting-edge lending software solutions for banks, alternative lenders, and fintech companies globally. Since its inception in 2012, HES FinTech has enabled businesses to optimize operations, lower expenses, and grow effectively through tailored, comprehensive lending platforms. W
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Vilnius, Lt
Services Provided+4 Services
18% Custom Web Application Development
13% API Development & Integration
7% Backend Development
7% Frontend Development
AI Summary
“HES Fintech delivers tailored lending software and AI-driven financial solutions, empowering banks and fintechs globally with secure, automated, and data-centric platforms to optimize operations and growth.”
UnifiedSync
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At UnifiedSync, we believe that technology should make life easier, not more difficult. We assist businesses in transforming complicated systems into cohesive digital environments that enhance efficiency, growth, and innovation. Our services range from custom web and mobile app development to API in
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
25% Custom Web Application Development
18% API Development & Integration
7% Mobile App Development (iOS & Android)
50% AI Strategy & Roadmap Consulting
AI Summary
“UnifiedSync delivers integrated digital solutions—including app development, system integration, DevOps, and AI—to simplify complexity and drive efficient, scalable growth for diverse businesses.”
CodeCrafters Labs
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CodeCrafters Labs: Achieving Success with Passion and Integrity Established in 2019, CodeCrafters Labs (CCL) is a leading provider of digital solutions and an educational center focused on "code-crafting for passion." We excel in offering high-quality, dependable software across a wide array of tec
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
25% Custom Web Application Development
18% API Development & Integration
7% Mobile App Development (iOS & Android)
50% Search Engine Optimization (SEO)
AI Summary
“CodeCrafters Labs delivers expert digital solutions in web development, CMS, and integrations while fostering developer growth through education, driven by integrity, innovation, and teamwork.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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