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

SyncGaze
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Tailored Django solutions, React/Flutter applications, and scalable software designed for businesses seeking durable technology partnerships. Over 10 production systems successfully delivered and more than 60,000 lines of code developed.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
25% API Development & Integration
40% Custom Web Application Development
25% Mobile App Development (iOS & Android)
10% E-Commerce Development
AI Summary
“SyncGaze delivers customized Django solutions and React/Flutter applications, providing scalable, reliable software with proven expertise across over 10 production systems and 60,000+ lines of code.”
UYGroup
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We are a consulting and software development company specializing in the financial sector. Since we started, we have dedicated ourselves to providing top-notch solutions that enhance our clients' management capabilities. Our team comprises Consultants, Analysts, and Developers with significant exper
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Montevideo, Montevideo, Uy
Services Provided+1 Services
35% Custom Web Application Development
25% API Development & Integration
20% Backend Development
10% Frontend Development
AI Summary
“UYGroup specializes in consulting and software development for the financial sector, delivering expert technological solutions that streamline business processes and enhance client management capabilities.”
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Ramsey Root Custom Software
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I'm a freelance software developer specializing in creating custom software solutions for various areas, including marketing (like AI marketing bots) and file management tools tailored to your unique business needs. Essentially, if it can be envisioned and developed, I can create it. With six years
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
Services Provided
50% Custom Web Application Development
35% API Development & Integration
15% Mobile App Development (iOS & Android)
AI Summary
“Ramsey Root Custom Software offers bespoke software development across marketing automation and file management, leveraging expertise in JavaScript, Python, and Java backend frameworks with an AI-driven approach.”
CodingRippler Tech Private Ltd
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CodingRippler is a product engineering partner based in India, selected by startups, small and medium-sized businesses (SMBs), and agencies for developing software intended for production rather than mere prototypes or empty promises. We function as an extended engineering team, aiding organizations
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Ahmedabad, Gujarat, In
Services Provided
20% API Development & Integration
13% Mobile App Development (iOS & Android)
17% Custom Web Application Development
50% Web App UI Design
AI Summary
“CodingRippler Tech delivers robust custom software, web and mobile apps, and system integrations, enabling startups and SMBs to launch products swiftly and scale efficiently with expert engineering support.”
Atero Solutions
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Atero Solutions creates effective digital products and business systems that enhance company operations, accelerate processes, and improve customer service. We integrate product design, software development, automation, and smart tools to address tangible operational challenges, rather than simply d
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Ottignies-Louvain-la-Neuve, Be
Services Provided
60% Custom Web Application Development
25% API Development & Integration
15% Mobile App Development (iOS & Android)
AI Summary
“Atero Solutions develops tailored digital products and systems that streamline operations, automate processes, and enhance customer experiences, focusing on practical solutions for complex business challenges.”
n8n Lab
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n8n Lab comprises a team of certified automation specialists who develop tailored AI agents and smart workflows for ambitious companies. We craft custom AI agents capable of managing intricate decision-making, data analysis, and customer interactions, functioning as a knowledgeable extension of your
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
18% AI Agent & Multi-Agent System Development
10% AI Strategy & Roadmap Consulting
7% Custom AI Chatbot Development
5% Machine Learning Model Development
AI Summary
“n8n Lab delivers tailored AI agents and enterprise workflows, integrating diverse systems via APIs to optimize operations, enhance decision-making, and drive efficiency across multiple industries.”
YeboApp
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YeboApp is the leading digital transformation partner in South Africa, harnessing AI to empower businesses with state-of-the-art web and automation solutions. We specialize in creating high-performance websites, intelligent AI chatbots, and comprehensive AI automation strategies aimed at fostering r
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
18% AI Strategy & Roadmap Consulting
15% Custom AI Chatbot Development
33% API Development & Integration
7% UX Research & Usability Testing
AI Summary
“YeboApp is a South African digital transformation partner leveraging AI to deliver high-performance websites, intelligent chatbots, and automation solutions, enhancing business growth, efficiency, and customer engagement.”
Improving
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With over 2,500 consultants in the US, Canada, Latin America, and India, Improving provides seasoned technologists who integrate into your market beyond just contributing to your project. Our teams have a strong grasp of the regulatory frameworks, industry standards, and technical demands relevant t
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
1000-9999
Employees
Plano, Texas, Us
Services Provided+9 Services
25% API Development & Integration
20% ERP & CRM Development
5% Legacy System Modernization
8% AI Strategy & Roadmap Consulting
AI Summary
“Improving offers expert technology consulting across industries like finance and healthcare, leveraging partnerships with leading AI and cloud providers to accelerate delivery and modernization.”
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Travor Consulting
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We simplify complexity: one portfolio, unified goals, and reliable outcomes. Ideal for expanding businesses looking to speed up their growth.
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Services Provided
34% API Development & Integration
33% Other IT Consulting and SI
33% Operational Process Consulting
AI Summary
“Travor Consulting streamlines business complexity by unifying portfolios and goals, delivering reliable outcomes that accelerate growth for expanding companies across varied sectors.”
Prodigitas
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Since 2015, Prodigitas has been providing Marketing Operations as a Service. The company was established to offer specialized, mission-oriented digital marketing teams and services. We build partnerships with B2B clients, industry leaders, and growing businesses worldwide, helping them achieve growt
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
33% API Development & Integration
20% Search Engine Optimization (SEO)
14% Pay Per Click
8% UX Research & Usability Testing
AI Summary
“Prodigitas delivers specialized, scalable marketing operations services and digital marketing support globally, focusing on innovation, collaboration, and long-term client partnerships for efficient strategy implementation.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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