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

Starrett Projects
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I’m a freelancer passionate about tackling business challenges, delivering exceptional user experiences, and designing sleek, professional-looking web pages. I can assist your project or business with either a static website or a comprehensive web-hosted application that manages payroll, completed t
Highlights
< $25/hr
Avg Hourly Rate
Jasper, Georgia, Us
Services Provided
75% Custom Web Application Development
25% API Development & Integration
AI Summary
“Starrett Projects is a freelance web development service offering tailored static sites and dynamic applications with modern technologies like React, Node.js, and comprehensive business solutions.”
Avance Software
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What activities do we engage in? What are our actions?
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
San Jose de Mayo, Uy
Services Provided
25% Custom Web Application Development
15% Mobile App Development (iOS & Android)
30% API Development & Integration
30% Backend Development
AI Summary
“Avance Software specializes in delivering innovative software solutions and IT services, focusing on enhancing client efficiency through customized technology applications and professional expertise.”
Nuora™ Digital Agency
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We are a small, hands-on engineering studio dedicated to assisting founders and product teams in creating reliable, user-focused products that are both fast and built with scalable technology. Our offerings range from polished user interfaces and tailored SaaS workflows to practical AI integrations,
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% API Development & Integration
20% E-Commerce Development
50% AI Agent & Multi-Agent System Development
AI Summary
“Nuora™ Digital Agency is a hands-on engineering studio delivering scalable, user-centric products with expertise in SaaS workflows, AI integrations, and custom solutions across diverse industries.”
TECHNO TOUCH BUSINESS SOLUTIONS
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We are a provider of IT solutions and a technological partner. Our goal is to deliver technology that helps your business achieve optimal efficiency and scalability. With years of industry experience, we offer valuable solutions to our clients. We aim to enhance customer relationships by building tr
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% API Development & Integration
20% E-Commerce Development
50% Cloud Consulting & SI
AI Summary
“Techn Touch Business Solutions offers tailored IT services focused on enhancing business efficiency, scalability, and customer trust through expertise and operational excellence.”
Mood Up
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Mobile development is our core focus. We stand out as one of the few companies globally that specializes in IoT. Our clients include prominent names such as Sky UK, Akamai, Unilever, and Spar, as well as dynamic start-ups like Grow Sensor and Vicodo. Our expertise covers several regions, including t
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Poznan, Greater Poland, Pl
Services Provided
85% Mobile App Development (iOS & Android)
15% API Development & Integration
AI Summary
“Mood Up specializes in mobile and IoT development, serving global clients across various industries with agile methodologies and advanced technologies to deliver innovative, high-performing solutions.”
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NT & O Analytics
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We transform your data into practical insights. Established in 2021 by an enthusiastic data engineer and a data scientist, our startup aims to enable businesses of all sizes to leverage their data effectively. Based in Johannesburg, South Africa, our dynamic team of experts is dedicated to fostering
Highlights
Sandton, Za
Services Provided
33% Cloud Consulting & SI
24% Cloud Infrastructure Setup (AWS / GCP / Azure)
10% DevOps Engineering
33% API Development & Integration
AI Summary
“NT & O Analytics is a Johannesburg-based startup transforming data into actionable insights, empowering businesses with expert data engineering and analytics solutions to drive innovation and growth.”
Decipher Zone Technologies Pvt Ltd
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Decipher Zone is a comprehensive software development firm that focuses on custom software solutions, as well as web and mobile application development, and IT consulting. We assist businesses in turning their concepts into scalable digital products by leveraging modern technologies and optimal engi
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Jaipur, Rajasthan, In
Services Provided
45% Custom Web Application Development
35% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“Decipher Zone Technologies Pvt Ltd. delivers custom software, web and mobile app development, and IT consulting, specializing in modern technologies for diverse sectors with agile, quality-driven solutions.”
Selectsoft
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Selectsoft is a software firm that is dedicated to empowering entrepreneurs to leverage technology for successful business development through performance tracking, monitoring, and comprehensive business management. Established in 2008 in Baia Mare, it is a fully Romanian company that serves clients
Highlights
10-49
Employees
Baia Mare, Maramures, Ro
Services Provided
65% Custom Web Application Development
25% API Development & Integration
10% Mobile App Development (iOS & Android)
AI Summary
“Selectsoft is a Romanian software company offering customizable business management solutions integrating inventory, invoicing, CRM, e-commerce, and financial tracking to support entrepreneurial growth.”
SFWeb
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SFWeb is a Canadian web agency specializing in tailored web development, API integrations, automation, SEO, and management of Google Ads for businesses seeking effective technical solutions.
Highlights
Toronto, Ontario, Ca
Services Provided
30% API Development & Integration
20% Custom Web Application Development
50% Digital Strategy
AI Summary
“SFWeb is a Canadian agency specializing in customized web development, API integration, automation, SEO, and Google Ads management to deliver effective digital solutions for businesses.”
Komshi LTd
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We are a group of dedicated and talented software developers who thrive on tackling challenging issues and designing cutting-edge solutions. Our priority is to provide top-notch software products customized to fit the specific requirements of our clients. With proficiency in various programming lang
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% Custom Web Application Development
30% API Development & Integration
20% Frontend Development
AI Summary
“Komshi LTd is a software development firm specializing in custom web, application, AR/VR, and low-code solutions, delivering innovative, high-quality technology products tailored to diverse client needs.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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