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

Sergio.pt
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Experienced CTO-level knowledge combines with rapid generative capabilities. This ensures the creation of intricate architectures with senior oversight that detects potential risks before they turn into liabilities.
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
Services Provided
25% Custom Web Application Development
20% API Development & Integration
5% Mobile App Development (iOS & Android)
50% AI Strategy & Roadmap Consulting
AI Summary
“Sergio.pt leverages experienced CTO-level expertise and rapid generative technology to design complex architectures with proactive risk detection, ensuring reliable and efficient solutions.”
Pinakin Kantha Consultancy LLP
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Pinakin Kantha consists of a team of over 220 Salesforce experts, all certified and recognized as Salesforce AppExchange Partners, Salesforce Implementation Partners, and Salesforce Consulting Partners.
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided+3 Services
20% IT Staff Augmentation
15% Cloud Consulting & SI
13% CRM Consulting and SI
2% Other IT Consulting and SI
AI Summary
“Pinakin Kantha Consultancy LLP is a team of 220+ certified Salesforce experts offering comprehensive consulting, implementation, and app development services as recognized Salesforce partners.”
Senza Codice
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Relied upon by both startups and large companies for creating top-notch web applications using Bubble and other no-code tools. Begin your project with us today!
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Novara, Piedmont, It
Services Provided
65% Custom Web Application Development
15% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“Senza Codice specializes in developing high-quality web applications for startups and enterprises, leveraging Bubble and no-code tools to streamline project creation and delivery.”
Roonyx
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An integrated BNPL solution - a streamlined system that unifies different aspects of BNPL services, automating tasks and facilitating seamless operations that are advantageous for both merchants and customers worldwide.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
New York, New York, Us
Services Provided+4 Services
10% Mobile App Development (iOS & Android)
20% Custom Web Application Development
20% API Development & Integration
15% E-Commerce Development
AI Summary
“Roonyx offers an integrated Buy Now, Pay Later solution that automates and streamlines BNPL services, enhancing operations for merchants and customers globally.”
Seedpath
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SeedPath is a tech partner focused on providing customized solutions and seamless integrations that improve digital environments and boost revenue. We deliver cohesive integration layers to streamline processes and develop custom products, ensuring our solutions fit specific requirements, whether fo
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Mx
Services Provided
25% API Development & Integration
25% Software Development Services
25% E-Commerce Development
25% Mobile App Development (iOS & Android)
AI Summary
“Seedpath excels in providing tailored software solutions with expertise in API Development, Custom Web Application Development, E-Commerce Development, and Mobile App Development (iOS & Android). Their focus on customized integrations and product development solidly fits the Software Development category.”
etechcube
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We are a group of highly experienced technical experts proficient in the latest technologies across diverse sectors such as logistics, BFSI, telecommunications, retail, pharmaceuticals, construction, and agriculture. At ETechCube, we are dedicated to delivering comprehensive software solutions for o
Highlights
$10,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
35% Custom Web Application Development
25% Mobile App Development (iOS & Android)
25% API Development & Integration
15% E-Commerce Development
AI Summary
“ETechCube offers expert-driven, comprehensive software solutions across varied industries including logistics, BFSI, telecom, retail, pharmaceuticals, construction, and agriculture, leveraging cutting-edge technologies.”
Mehul Gohil
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Mehul Gohil is a Certified Expert WordPress Developer with more than 12 years of experience in providing tailored WordPress solutions for businesses, agencies, and startups. His areas of expertise include plugin development, complete site creation, performance enhancement, and React-based admin inte
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Ahmedabad, Gujarat, In
Services Provided
24% API Development & Integration
10% E-Commerce Development
33% Search Engine Optimization (SEO)
33% Landing Page Design
AI Summary
“Mehul Gohil is a certified WordPress developer with 12+ years of experience delivering custom plugins, site creation, performance optimization, and React-based admin solutions for diverse clients globally.”
Software Development Hub
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Software Development Hub, commonly referred to as SDH, is a company composed of over 100 dedicated professionals specializing in digital transformation and software development. We assist rapidly expanding businesses and startups in reaching their objectives through outsourcing. Our services cover t
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Hamburg, Hamburg, De
Services Provided+1 Services
25% Custom Web Application Development
15% API Development & Integration
10% DevOps Engineering
35% Machine Learning Model Development
AI Summary
“Software Development Hub is a Germany-based expert firm delivering custom software, DevOps, and AI solutions, supporting global clients in healthcare, education, finance, and startups with digital transformation.”
Digica
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Digica is an autonomous company specializing in Data Science and Artificial Intelligence. We assist our clients by integrating the latest Data Science and AI technologies into their systems and products, resulting in tailored solutions. Our knowledgeable team, backed by our own comprehensive researc
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Manchester, England, Gb
Services Provided+4 Services
14% Machine Learning Model Development
13% Computer Vision Solutions
3% AI Strategy & Roadmap Consulting
3% LLM Integration & Prompt Engineering
AI Summary
“Digica delivers expert AI-driven software solutions and strategic consulting, specializing in machine learning, computer vision, and data science to empower diverse industries with tailored AI integration.”
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Netray.co - Aerospace AI Consulting
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Netray provides tailored AI solutions for companies in the aerospace, space, and defense sectors. We focus on intelligent agents, RAG systems, and predictive maintenance, all aimed at achieving quantifiable outcomes. Over 50 aerospace companies have placed their trust in us, resulting in a 95% succe
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
23% AI Agent & Multi-Agent System Development
10% AI Strategy & Roadmap Consulting
5% Custom AI Chatbot Development
12% Machine Learning Model Development
AI Summary
“Netray.co specializes in tailored AI solutions for aerospace, space, and defense sectors, delivering intelligent agents and predictive maintenance with a 95% project success rate.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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