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

AboveDev
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In today's world, digitalization is essential for businesses to thrive. We offer support in communicating, designing, developing, testing, and deploying maintainable code projects. Our passion lies in extracting insights from data, powering AI, and analyzing model statistics. While we're a small but
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Sofia, Sofia, Bg
Services Provided+2 Services
25% Custom Web Application Development
20% API Development & Integration
5% Blockchain & Web3 Development
25% Machine Learning Model Development
AI Summary
“AboveDev is a skilled software team specializing in design, development, AI-driven data insights, and cloud solutions to deliver maintainable code and seamless user experiences.”
Zette
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Zette is a comprehensive mobile development agency that leverages its unique technology to quickly create impressive mobile applications that satisfy both users and clients. Whether you're looking to develop a minimum viable product, launch a new cross-platform mobile app, or if you're uncertain abo
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Raleigh, North Carolina, Us
Services Provided
40% Mobile App Development (iOS & Android)
10% API Development & Integration
50% Product UX Strategy
AI Summary
“Zette is a mobile development agency specializing in rapidly creating user-friendly cross-platform applications, offering MVP creation, strategic guidance, and long-term mobile support services.”
SpreadLogics
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SpreadLogics is an agency specializing in Business Intelligence and Data Analytics that assists mid-to-large enterprises in converting raw data into informed decisions. With over a decade of experience, we have successfully completed more than 1,900 reporting and automation projects in 75 countries.
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Brovary, Kyiv, Ua
Services Provided+8 Services
10% Business Intelligence (BI) Dashboard Development
8% ETL Pipeline Development
2% Marketing Mix Modeling (MMM)
8% Workflow Automation (Zapier / Make / n8n)
AI Summary
“SpreadLogics is a global agency specializing in Business Intelligence and Data Analytics, delivering tailored reporting, automation, and BI strategy services to mid-to-large enterprises across diverse industries.”
ecom.software
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Who are we? ECOM is a premier IT team that specializes in software solutions for the insurance and financial industries. Our mission is to turn our clients' visions into successful outcomes. We utilize AI, cloud technology, and SaaS, with Agile principles at our core. Our Solutions: By leveraging
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Torun, Kuyavian Pomeranian, Pl
Services Provided+1 Services
40% Custom Web Application Development
20% Mobile App Development (iOS & Android)
15% API Development & Integration
15% Cloud Consulting & SI
AI Summary
“ecom.software delivers tailored software, mobile apps, and cloud solutions for financial and insurance sectors, leveraging AI and Agile to drive digital transformation and operational efficiency.”
Coblit Sp. z o.o.
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Coblit is a tech company that offers customized AI and software solutions. With teams located in Gdańsk and Paris, we focus on creating specialized web and mobile applications, secure system integrations, and automation platforms designed to help businesses grow more efficiently. Our mission is to e
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Gdansk, Pomeranian, Pl
Services Provided+4 Services
18% Custom Web Application Development
12% Mobile App Development (iOS & Android)
15% API Development & Integration
5% Legacy System Modernization
AI Summary
“Coblit Sp. z o.o. delivers tailored AI-driven software, web and mobile applications, system integrations, and automation solutions, enhancing business efficiency and supporting unique workflows with advanced technology.”
UnistackSolutions
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At Unistack Solutions, we create and build smart, scalable, and efficient digital solutions customized to meet your business requirements. Whether it's AI-driven applications, SaaS platforms, or bespoke web and mobile systems, we assist businesses in streamlining processes, enhancing productivity, a
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% API Development & Integration
10% E-Commerce Development
20% Mobile App Development (iOS & Android)
50% DevOps Engineering
AI Summary
“Unistack Solutions delivers customized, scalable digital technologies—including AI applications, SaaS platforms, and bespoke web/mobile systems—to optimize business processes and drive growth efficiently.”
Esovisco Ltd.
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Industrial IT systems for managing and enhancing the operation of equipment, machinery, and personnel.
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Gdansk, Pomeranian, Pl
Services Provided
20% ERP & CRM Development
20% API Development & Integration
10% Mobile App Development (iOS & Android)
50% Operational Process Consulting
AI Summary
“Esovisco Ltd. develops industrial IT systems that optimize equipment, machinery, and workforce operations, enhancing management and operational efficiency across manufacturing and industrial sectors.”
Web Peppers
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Web Peppers is a worldwide provider of IT outsourcing and dedicated teams, boasting exceptional technical expertise in web development and IT recruitment. We serve a diverse range of businesses, from startups to large corporations, all at competitive prices. Developing web solutions is a core focus
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kyiv, Kv, Ua
Services Provided
25% Custom Web Application Development
15% Backend Development
10% API Development & Integration
50% Machine Learning Model Development
AI Summary
“Web Peppers provides global IT outsourcing and dedicated teams, delivering expert web development and AI solutions across diverse technologies to businesses of all sizes at competitive rates.”
Codebooq
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Codebooq is a software development company based in the EU that specializes in creating custom software solutions using technologies like .NET, Angular, React, and Xamarin, while fully leveraging the services of Azure and AWS. Our team guides projects through the entire lifecycle, starting from idea
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Zagreb, Grad Zagreb, Hr
Services Provided
25% Custom Web Application Development
15% Mobile App Development (iOS & Android)
10% API Development & Integration
50% IT Staff Augmentation
AI Summary
“Codebooq is an EU-based software development firm delivering custom solutions using .NET, Angular, React, and cloud services, guiding projects from concept to deployment with expert teams.”
Fainchap Technologies
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Fainchap serves as a strategic technology partner for expanding businesses that need dependable AI and software systems. We work alongside founders and leadership teams to convert complex concepts into ready-for-production systems, minimizing the risks, costs, and uncertainties typically linked to i
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Melbourne, Victoria, Au
Services Provided
25% Custom Web Application Development
15% Mobile App Development (iOS & Android)
10% API Development & Integration
50% AI Agent & Multi-Agent System Development
AI Summary
“Fainchap Technologies partners with growing businesses to deliver AI-driven automation and custom software solutions, emphasizing practical engineering, scalability, and compliance for sustainable growth.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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