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

Suhradam Software Incorporation
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At Suhradam Software, we focus on developing innovative software and mobile applications. Our talented engineers utilize advanced technologies such as Java, Python, PHP, React JS, React Native, Flutter, ASP.NET, and Oracle development to provide strong, scalable, and user-focused solutions. By mergi
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
35% Mobile App Development (iOS & Android)
AI Summary
“Suhradam Software excels in delivering innovative, scalable software and mobile solutions using technologies like Java, Python, React, and Oracle, driving business growth and innovation across platforms.”
Unique Design Consultant
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Unique Design Consultant is a prominent CRM consulting and business automation firm in India, focused on providing tailored solutions utilizing Bitrix24 CRM. We assist businesses in optimizing their sales processes, enhancing team efficiency, and facilitating digital transformation through intellige
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
15% Robotic Process Automation (RPA)
35% CRM Consulting and SI
20% Custom Web Application Development
30% API Development & Integration
AI Summary
“Unique Design Consultant specializes in tailored Bitrix24 CRM solutions, enabling businesses across industries to automate processes, enhance efficiency, and achieve digital transformation through integrated platforms and expert support.”
AsoA
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AsoA develops a 1.5-second deterministic autonomous AI voice system specifically for the US Real Estate industry. Our solution replaces slow human Inside Sales Agents (ISAs) with a closed-loop telecom system that autonomously intercepts, qualifies, and delivers verified inbound leads directly to a m
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
15% AI Agent & Multi-Agent System Development
35% Generative AI
30% API Development & Integration
20% Custom Web Application Development
AI Summary
“AsoA offers a rapid AI-driven voice system for the US real estate sector, automating lead interception and qualification to enhance brokerage CRM efficiency and advertising ROI.”
B2C InfoSolutions
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B2C Info Solutions is a leading digital technology firm that offers complete product engineering services. We harness the power of experience design, advanced engineering, and cloud technology to create innovative web and mobile applications, facilitating digital transformation for businesses. Our u
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Noida, Uttar Pradesh, In
Services Provided+1 Services
35% Mobile App Development (iOS & Android)
20% API Development & Integration
10% QA & Software Testing
25% Custom Web Application Development
AI Summary
“B2C InfoSolutions is a digital technology firm delivering comprehensive mobile and web app development, testing, and cloud-based solutions globally, empowering business transformation through agile methodologies.”
Creative Web
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📍Creative Web Company offers IT consulting and development services globally. We create tailored IT solutions for businesses, supply resources for project development through outsourcing and outstaffing, and provide consulting services to help businesses save time and resources. Our team's primary
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Yerevan, Am
Services Provided
40% Custom Web Application Development
25% Mobile App Development (iOS & Android)
25% API Development & Integration
10% SaaS Product Development
AI Summary
“Creative Web Company delivers tailored IT consulting, custom software development, and outsourcing services globally, specializing in innovative web and mobile solutions across diverse industries.”
Spinsage
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At Spinsage, we specialize in creating affordable technology solutions specifically designed for small and medium-sized businesses. By implementing modern design thinking principles and utilizing Lean and Agile development methodologies, we harness cutting-edge tools and technologies to create custo
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Bengaluru, Karnataka, In
Services Provided
40% Custom Web Application Development
25% Mobile App Development (iOS & Android)
25% API Development & Integration
10% Legacy System Modernization
AI Summary
“Spinsage delivers affordable, customized technology solutions for small and medium businesses, specializing in web, mobile, and cloud application development alongside expert IT consulting services.”
Anemo Technology
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We are a group of five skilled developers focused on comprehensive mobile development solutions. With a proven history across multiple areas, we are ready to turn your concepts into reality. Our expertise includes a range of services: Whether you need to start a new online shop, create a custom appl
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Istanbul, Istanbul, Tr
Services Provided
60% Mobile App Development (iOS & Android)
25% Custom Web Application Development
15% API Development & Integration
AI Summary
“Anemo Technology is a skilled team specializing in comprehensive mobile development, delivering custom applications, online shops, and business process solutions with client collaboration throughout.”
On Step Lab SRL
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We turn concepts into digital experiences by providing creative, innovative, and customized solutions to improve your corporate communication. Our agency specializes in creating digital solutions for businesses. Emphasizing creativity and technological advancement, we collaborate closely with our cl
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Chisinau, Chisinau, Md
Services Provided
40% Custom Web Application Development
25% API Development & Integration
25% E-Commerce Development
10% Mobile App Development (iOS & Android)
AI Summary
“On Step Lab SRL offers tailored software development and IT consulting, transforming ideas into innovative digital solutions that enhance corporate communication and business processes.”
Practical Solutions Technologies
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Welcome to Practical Solutions Technologies, where cutting-edge innovation blends with extensive technical knowledge. We provide tailored solutions that deliver tangible business advantages. Our primary specialization is in SAP ABAP development for SAP ECC and S/4HANA, encompassing CDS views, RAP ap
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
25% API Development & Integration
25% Software Development Services
25% Mobile App Development (iOS & Android)
25% Custom Web Application Development
AI Summary
“Practical Solutions Technologies excels in Software Development, offering expert custom SAP solutions, high-performance SAP Fiori applications, and robust API integrations. Their proficiency in web, mobile, and API development positions them as a solid fit for this category.”
J
JITS
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Examination
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
33% API Development & Integration
34% Backend Development
33% Mobile App Development (iOS & Android)
AI Summary
“JITS specializes in examination services, offering comprehensive solutions to support evaluation and assessment needs across various sectors with precision and professionalism.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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