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

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Durable Programming
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Situated just north of Boston, Durable Programming, LLC is equipped to tackle the most challenging technical problems. For your complex custom software requirements, you don't just require any programming service – you need Durable Programming.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% Legacy System Modernization
50% Custom Web Application Development
20% API Development & Integration
AI Summary
“Durable Programming, LLC, based near Boston, specializes in solving complex custom software challenges through robust and reliable programming services tailored to diverse technical needs.”
Remote Skills
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Remote Skills Ltd. is a forward-thinking company that specializes in AI-driven application development aimed at revolutionizing businesses with customized software solutions. We focus on leveraging advanced AI technologies, providing a wide array of services such as Retrieval-Augmented Generation (R
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
London, England, Gb
Services Provided+1 Services
35% Custom Web Application Development
15% API Development & Integration
20% Generative AI
18% Custom AI Chatbot Development
AI Summary
“Remote Skills Ltd. specializes in AI-driven custom software, offering services like NLP, computer vision, and predictive analytics to enhance business efficiency and growth across industries.”
Lakshya Leaders Education Software P Ltd.
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Utilize our knowledge for top-notch Azure and AWS solutions, covering everything from architecture to development. Our agile teams ensure timely delivery with excellent technical proficiency in C#, NodeJS, React, and more. We have created over 10,000 APIs and 5,000 web pages, effortlessly integratin
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
10% Mobile App Development (iOS & Android)
23% Custom Web Application Development
17% API Development & Integration
50% Cloud Consulting & SI
AI Summary
“Lakshya Leaders Education Software P Ltd. delivers expert Azure and AWS solutions with agile teams proficient in C#, NodeJS, and React, developing APIs, web pages, and seamless integrations.”
BrainoTechnologies
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Does your company offer great products but struggle to attract attention? Have you made efforts without seeing the results you hoped for? Are you thinking about enhancing your website but unsure where to begin? You've come to the right place! At Braino Technologies, we focus on effective communicati
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
New Delhi, Delhi, In
Services Provided+2 Services
20% API Development & Integration
30% Mobile App Development (iOS & Android)
13% Search Engine Optimization (SEO)
13% Content Marketing Strategy
AI Summary
“Braino Technologies specializes in website development, digital marketing, SEO, and social media strategies to enhance online presence and drive sales through innovative, customer-focused solutions.”
Tecsack software private limited
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Tecsack Software is an emerging startup located in Salem, India, dedicated to providing top-notch software solutions to clients around the globe. Our expertise lies in custom software development, mobile app creation, application support, and comprehensive maintenance services tailored for enterpris
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
40% Mobile App Development (iOS & Android)
45% Custom Web Application Development
15% API Development & Integration
AI Summary
“Tecsack Software is an emerging Indian startup specializing in custom software development, mobile apps, and enterprise application support, delivering scalable and secure solutions for global clients.”
Aciano Technologies
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**About Us** Aciano Technologies is an IT services firm that focuses on IT Staff Augmentation and Custom Software Development, aiding businesses in accelerating growth, minimizing hiring challenges, and confidently delivering software solutions. **IT Staff Augmentation** We assist startups, s
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Karachi, Sindh, Pk
Services Provided+4 Services
15% Custom Web Application Development
10% API Development & Integration
10% SaaS Product Development
3% E-Commerce Development
AI Summary
“Aciano Technologies specializes in custom software development and IT staff augmentation, delivering tailored digital solutions and flexible team scaling to accelerate business growth and software delivery.”
Codetech Software
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Codetech: We develop customized software solutions designed to drive sustainable business growth and streamline complex operations into flexible, scalable, and smart workflows. By combining advanced technology with a commitment to ethical and transparent collaboration, we prioritize your success as
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Uberlandia, Br
Services Provided+1 Services
23% Custom Web Application Development
17% API Development & Integration
10% Mobile App Development (iOS & Android)
30% Custom AI Chatbot Development
AI Summary
“Codetech Software develops customized, scalable software solutions that streamline complex business operations, emphasizing advanced technology and ethical collaboration to drive sustainable growth.”
AJVION TECHNOLOGIES
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Ajvion Technologies is a software development firm that focuses on creating high-quality mobile, web, and cloud applications. With over a decade of experience, our team delivers secure, scalable, and user-friendly digital products tailored for both startups and enterprises. We utilize modern technol
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
45% Mobile App Development (iOS & Android)
40% Custom Web Application Development
15% API Development & Integration
AI Summary
“Ajvion Technologies specializes in developing secure, scalable mobile, web, and cloud applications using modern frameworks, offering end-to-end software solutions tailored for startups and enterprises.”
Parijat Software Inc
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Parijat Software Inc. is a top-notch software development company dedicated to providing innovative digital solutions customized to meet the specific requirements of our clients. Our experienced team of developers and design specialists excels at bringing concepts to life, offering comprehensive ser
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% Software Development Services
30% Custom Web Application Development
20% API Development & Integration
20% Generative AI
AI Summary
“Parijat Software Inc is a skilled software development company delivering custom web application solutions and API integration services, adept at leveraging cutting-edge technologies to meet client-specific needs efficiently.”
Shaped Thoughts
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We are a remote-first boutique software company created by a team of software professionals united by common values and a deep passion for developing impactful software. As a specialized software firm, we prioritize a personalized approach for each of our clients. Our cross-functional Product Engine
Highlights
$50,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Warszawa, Masovian, Pl
Services Provided+1 Services
35% Custom Web Application Development
15% API Development & Integration
20% Other IT Consulting and SI
15% IT Staff Augmentation
AI Summary
“Shaped Thoughts is a remote-first boutique software company specializing in personalized, high-quality product engineering through skilled, cross-functional teams focused on impactful, adaptable client solutions.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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