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

Marqui Infoway
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Founded in 2014, Marqui Infoway is a dedicated Laravel development agency that specializes in creating secure, scalable, and high-performing web applications. Laravel serves as the foundation of our services, which include custom business applications, SaaS platforms, API-based systems, and enterpri
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% Custom Web Application Development
30% API Development & Integration
10% E-Commerce Development
20% Backend Development
AI Summary
“Marqui Infoway is a Laravel-focused agency offering secure, scalable web applications, custom SaaS platforms, APIs, and enterprise solutions with expert development and ongoing support.”
Altitude IT
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As a rising startup, Altitude IT is driven by a strong desire to establish itself and make an impact in the tech industry. We focus on delivering cutting-edge IT solutions that enable businesses to enhance their operations, streamline their processes, and meet their strategic objectives. Our talente
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Novi Sad, Rs
Services Provided
35% Custom Web Application Development
25% API Development & Integration
30% Mobile App Development (iOS & Android)
10% Frontend Development
AI Summary
“Altitude IT is a dynamic startup delivering advanced IT solutions with expertise in modern technologies, offering flexible outsourcing and trial services to enhance business operations globally.”
Blackbird Labs
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Custom software solutions and IT staffing services. We are part of a company group with over 40 years of experience. Our dedicated training center is designed to enhance the skills of more than 400 individuals annually, offering 8 hours of training each day for eight months.
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Jacksonville, Florida, Us
Services Provided
40% Custom Web Application Development
25% API Development & Integration
20% QA & Software Testing
15% Legacy System Modernization
AI Summary
“Blackbird Labs delivers custom software solutions and IT staffing services, backed by over 40 years of experience and a dedicated training center enhancing over 400 professionals annually.”
ITELLIGENTIX
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ITELLIGENTIX is a custom software development firm that focuses on creating personalized software and comprehensive development solutions. We aim to provide cutting-edge software designed specifically to address the individual requirements of our clients. Our dedicated team of professionals blends t
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Novi Sad, Rs
Services Provided
40% Custom Web Application Development
25% API Development & Integration
20% Mobile App Development (iOS & Android)
15% Frontend Development
AI Summary
“ITELLIGENTIX develops custom software solutions tailored to client needs, combining technical expertise and industry insight to drive business growth through quality and collaboration.”
DePronto Infotech
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DePronto Infotech is a Software Development Company that is dynamic and innovative, committed to providing advanced technology solutions throughout India and the UK. Our expertise is twofold: we provide skilled in-house developers who are proficient in various areas. We operate within two main servi
Highlights
$5,000+
Min Project Size
50-249
Employees
Mumbai City, Maharashtra, In
Services Provided
20% QA & Software Testing
20% API Development & Integration
10% Legacy System Modernization
50% IT Staff Augmentation
AI Summary
“DePronto Infotech is a dynamic software development company delivering advanced technology solutions with skilled developers across India and the UK, specializing in diverse IT services.”
QPillars
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QPillars creates AI agents that allow scientists to operate laboratory instruments using natural language, ensuring human oversight at all times. We are developing MCP (Model Context Protocol) servers for scientific equipment, which facilitate standardized AI connectivity with any laboratory hardwar
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Bonstetten, Ch
Services Provided
30% Custom Web Application Development
20% API Development & Integration
33% LLM Integration & Prompt Engineering
17% AI Agent & Multi-Agent System Development
AI Summary
“QPillars develops AI agents and software enabling natural language control and real-time monitoring of laboratory instruments, integrating advanced scientific expertise to simplify complex lab operations.”
AntonX
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AntonX is a custom software development agency located in Central London, specializing in creating cross-platform applications using Flutter, primarily for startups and enterprises. The company has been developing Flutter apps since 2017.
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Pk
Services Provided+2 Services
45% Mobile App Development (iOS & Android)
25% API Development & Integration
20% Product UX Strategy
5% QA & Software Testing
AI Summary
“AntonX specializes in delivering custom mobile apps and API integrations, emphasizing quality through application testing and efficient DevOps managed services, making them a strong fit in Software Development.”
Samsotech
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Samsotech is more than just a developer of equipment; it's a technological leader in the UAE's hotel industry, where every moment of guest check-in is crucial. Their systems set a new benchmark for the automatic scanning of passports and ID cards by integrating optical character recognition, working
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Services Provided
30% API Development & Integration
20% Custom Web Application Development
20% IT Compliance & Governance
30% Managed IT Services
AI Summary
“Samsotech leads UAE's hotel tech with advanced, secure guest document scanning and verification systems featuring AI, facial recognition, and seamless API integration for efficient, safe registration.”
ITPenthouse
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Formerly known as OPORASOLUTIONS.COM, we are a close-knit, fully remote team of engineers located in Ukraine and Poland, rather than a large outsourcing organization. Since 2017, we have fostered long-term partnerships with clients from the US and Europe, providing clean and scalable custom software
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Lviv, Lviv, Ua
Services Provided+1 Services
25% Software Development Services
25% Custom Web Application Development
20% API Development & Integration
15% QA & Software Testing
AI Summary
“ITPenthouse specializes in Custom Web Application Development, API Development & Integration, and Mobile App Development (iOS & Android), showcasing their expertise in building scalable, modern software solutions with technologies like Laravel, NodeJS, and AWS.”
Tegimus Infotech
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Tegimus Infotech is a software consultancy that focuses on web, cloud-based, and mobile application solutions. We are dedicated to providing custom, application-oriented systems that meet the specific needs of each client, from simple websites and mobile apps to complex online portals and multi-serv
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Kannur, Kerala, In
Services Provided
25% API Development & Integration
50% Custom Web Application Development
25% Mobile App Development (iOS & Android)
AI Summary
“Tegimus Infotech is a software consultancy specializing in custom web, cloud, and mobile application solutions, delivering tailored systems and proactive expertise to drive long-term business growth.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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