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

Fraser Technologies
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Fraser Technologies comprises a team of skilled and experienced developers who focus on PostgreSQL, Java, and SolidJS. Our knowledge in dependable database management and scalable Java applications allows us to provide innovative solutions designed specifically to fulfill our clients' software devel
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% Custom Web Application Development
20% Mobile App Development (iOS & Android)
30% API Development & Integration
AI Summary
“Fraser Technologies specializes in PostgreSQL, Java, and SolidJS development, delivering scalable, optimized, and innovative software solutions with expertise in backend and responsive front-end design.”
BetaMize
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We are dedicated to enabling businesses to thrive through technology. With our proficiency in software development and extensive knowledge across various industries, we have effectively provided innovative solutions that boost productivity, optimize operations, and foster growth for our clients. Our
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% API Development & Integration
50% Custom Web Application Development
20% Mobile App Development (iOS & Android)
AI Summary
“BetaMize leverages technological expertise to deliver tailored software solutions that enhance productivity, optimize operations, and support business growth across diverse industries.”
The Jed Mahonis Group
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The Jed Mahonis Group is a comprehensive digital product consultancy located in the U.S. Our team is made up of developers rather than salespeople, and we do not impose project minimums. We focus on assisting small and medium-sized businesses in creating customized solutions. Partnering with us mean
Highlights
$50-99/hr
Avg Hourly Rate
10-49
Employees
Minneapolis, Minnesota, Us
Services Provided+2 Services
30% Custom Web Application Development
15% Mobile App Development (iOS & Android)
25% API Development & Integration
10% SaaS Product Development
AI Summary
“The Jed Mahonis Group provides tailored digital product consultancy for small and medium businesses across the U.S., delivering dedicated remote development and strategic technology solutions.”
PReferMe.ai
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The future of recruitment is shifting away from generic applications and towards meaningful connections. At pReferMe, we are transforming the hiring landscape in India by harnessing the power of verified employee referrals. Our platform connects exceptional job seekers with reliable professionals al
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Pune, Maharashtra, In
Services Provided+3 Services
5% AI Strategy & Roadmap Consulting
8% LLM Integration & Prompt Engineering
8% Custom AI Chatbot Development
12% Generative AI
AI Summary
“PReferMe.ai modernizes recruitment in India by facilitating verified employee referrals, connecting job seekers with trusted insiders and enabling employees to monetize their networks efficiently.”
NexviaTech
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We are a technology and artificial intelligence solutions agency dedicated to developing production-ready AI, automation, and web platforms tailored for contemporary businesses. Our specialized skills encompass AI and Machine Learning, Generative AI, intelligent automation, and comprehensive develop
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
33% API Development & Integration
9% AI Agent & Multi-Agent System Development
10% Generative AI
5% AI Strategy & Roadmap Consulting
AI Summary
“NexviaTech delivers scalable AI, automation, and web platform solutions, leveraging expertise in machine learning and generative AI to meet diverse business needs for startups and enterprises.”
Flograte
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At Flograte, we focus on automating business processes and providing seamless integration solutions designed to improve your organization. Our rapid application development method allows your business to function smoothly, avoiding the interruptions often associated with lengthy and expensive ERP an
Highlights
10-49
Employees
Services Provided
30% API Development & Integration
15% Custom Web Application Development
5% E-Commerce Development
50% ERP Consulting and SI
AI Summary
“Flograte delivers automated business process integration and tailored ERP, CRM, and Azure solutions, enabling efficient, scalable, and cost-effective digital transformations for organizations.”
Imperium Marketing Solutions
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We recognize that every business has distinct goals, which is why we customize every marketing strategy and automation to suit your specific needs.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Gainesville, Florida, Us
Services Provided+3 Services
33% API Development & Integration
33% UX Research & Usability Testing
10% Search Engine Optimization (SEO)
10% Email Marketing & Automation
AI Summary
“Imperium Marketing Solutions delivers comprehensive marketing services, leveraging innovative strategies to enhance brand presence and drive business growth across diverse industries.”
Delcog Technologies
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We are a comprehensive web development and digital solutions company that focuses on creating modern, high-performance applications. Our skill set includes MERN Stack Development, Next.js applications, WordPress, WooCommerce, and Shopify, which empower businesses to create scalable, secure, and conv
Highlights
$25-49/hr
Avg Hourly Rate
Thane, Maharashtra, In
Services Provided
45% Custom Web Application Development
25% API Development & Integration
20% E-Commerce Development
10% Mobile App Development (iOS & Android)
AI Summary
“Delcog Technologies delivers comprehensive web development and digital solutions, specializing in scalable applications, custom CRMs, e-commerce, automation, and secure hosting for enhanced business performance.”
Nocturne Development
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Develop, Expand, and Update your Web Platform. Local web development services in Calgary, Alberta.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Calgary, Alberta, Ca
Services Provided
60% Custom Web Application Development
30% API Development & Integration
10% Mobile App Development (iOS & Android)
AI Summary
“Nocturne Development offers local, professional web development services in Calgary, Alberta, specializing in developing, expanding, and updating web platforms to meet diverse client needs.”
PHP developer
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I am a freelance developer located in Swansea, South Wales, with expertise in Laravel, Livewire, Alpine, and Tailwind. I collaborate closely with a select group of clients on a retainer model, establishing myself as a reliable, long-term partner in achieving success for your product.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Services Provided
60% Custom Web Application Development
30% API Development & Integration
10% Mobile App Development (iOS & Android)
AI Summary
“Freelance PHP developer based in Swansea, specializing in Laravel, Livewire, Alpine, and Tailwind, offering reliable, long-term partnerships with select clients through a retainer model.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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