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

PILOTLAB LLC
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PILOTLAB LLC is a dedicated partner in SaaS development, assisting startups and large enterprises in the design, construction, and scaling of secure cloud platforms. With more than 12 years of experience and over 100 product launches under their belt, the team provides solutions such as multi-tenant
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
18% API Development & Integration
22% Custom Web Application Development
10% Mobile App Development (iOS & Android)
30% Search Engine Optimization (SEO)
AI Summary
“PILOTLAB LLC specializes in secure, scalable SaaS development, delivering cloud platforms, AI integrations, and mobile apps with expertise across fintech, e-commerce, healthcare, and logistics sectors.”
Koders Squad
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Koders Squad, a highly esteemed IT firm located in Gujarat, is dedicated to providing exceptional IT services to clients across the globe. Our mission focuses on promoting continuous growth and advancement in the industry, sharing our expertise internationally, and building relationships with new cl
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
20% API Development & Integration
10% E-Commerce Development
20% Mobile App Development (iOS & Android)
35% Search Engine Optimization (SEO)
AI Summary
“Koders Squad, based in Gujarat, is a distinguished IT firm delivering global 24/7 IT services focused on client satisfaction, expertise sharing, and industry advancement.”
Tera Craft Technologies
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Our goal is to convert business obstacles into opportunities by providing smart IT solutions, helping our clients achieve new levels of success. Our offerings include: - Tailored Software Development - Specialized Development Teams - Transitioning from No-code platforms to Custom solutions - Java D
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kyiv, Kyiv, Ua
Services Provided+3 Services
33% Custom Web Application Development
18% API Development & Integration
15% Other IT Consulting and SI
12% ERP Consulting and SI
AI Summary
“Tera Craft Technologies delivers tailored IT solutions, including software development, consulting, and web services, transforming business challenges into growth opportunities across diverse industries.”
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Optimum Consultancy Services
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Optimum is a consulting firm specializing in Software and Cloud Solutions and Services, dedicated to transforming businesses through the integration of People, Innovative Technology, and Automated Processes. Leveraging our extensive expertise in strategic planning, process optimization, and cutting-
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Houston, Texas, Us
Services Provided+2 Services
13% API Development & Integration
20% Custom Web Application Development
7% Legacy System Modernization
10% ERP & CRM Development
AI Summary
“Optimum Consultancy Services delivers comprehensive software and cloud solutions, integrating innovative technology and automation to optimize business processes, enhance efficiency, and support digital transformation across industries.”
Inditronics Pvt Ltd
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Inditronics is an Indian company specializing in the development of electronic products, offering advanced services throughout the entire product lifecycle. Our offerings encompass comprehensive electronics and product design, extending to real-time enterprise IoT integration, prototyping, commercia
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Pune, Maharashtra, In
Services Provided+1 Services
10% Custom Web Application Development
15% API Development & Integration
25% Product Design
25% Machine Learning Model Development
AI Summary
“Inditronics Pvt Ltd develops and manufactures electronic products, offering comprehensive design, prototyping, IoT integration, and software solutions throughout the entire product lifecycle in complex engineering contexts.”
Trackify
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Trackify specializes in consulting and implementing diverse RFID solutions, supporting businesses during their digital transformation and automation processes. We have executed numerous RFID projects across various sectors, including warehouse management, logistics supply chains, production lines, r
Highlights
50-249
Employees
Hanoi, Vn
Services Provided+1 Services
15% API Development & Integration
10% Custom Web Application Development
25% Operational Process Consulting
25% Digital Strategy
AI Summary
“Trackify provides expert consulting and implementation of RFID solutions across multiple industries, enhancing automation and digital transformation in logistics, production, retail, and security sectors.”
وايدرز widers
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Widers is a WhatsApp Business API platform based in Saudi Arabia and officially certified by Meta. We assist businesses in automating customer interactions, executing WhatsApp marketing campaigns, creating chatbots, and integrating with e-commerce platforms such as Salla. We provide support to busin
Highlights
$25,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+4 Services
18% AI Agent & Multi-Agent System Development
10% CRM Consulting and SI
5% Cloud Consulting & SI
22% API Development & Integration
AI Summary
“Widers, a Meta-certified WhatsApp Business API platform in Saudi Arabia, enables businesses to automate customer interactions, run marketing campaigns, build chatbots, and integrate e-commerce with 24/7 Arabic support.”
Candev Studio
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Candev is a skilled group of developers committed to transforming your concepts into impactful digital experiences. We focus on creating customized websites, mobile applications, and bespoke software solutions that balance functionality, aesthetics, and efficiency.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Chicago, Illinois, Us
Services Provided+1 Services
35% Custom Web Application Development
30% Mobile App Development (iOS & Android)
15% API Development & Integration
10% E-Commerce Development
AI Summary
“Candev Studio is a proficient developer team specializing in tailored websites, mobile apps, and software solutions, integrating functionality and design for impactful digital experiences.”
Neusoft EDC
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Neusoft EDC is a prominent IT service provider with a strong presence in Europe. With an emphasis on innovative solutions, Neusoft EDC serves as a dependable and professional partner for various business challenges. Founded in Cluj-Napoca in 2007, we have established a significant foothold in the so
Highlights
$50-99/hr
Avg Hourly Rate
50-249
Employees
Cluj-Napoca, Cluj, Ro
Services Provided+3 Services
25% Custom Web Application Development
18% API Development & Integration
8% QA & Software Testing
20% AI Strategy & Roadmap Consulting
AI Summary
“Neusoft EDC, founded in 2007 in Cluj-Napoca, is a professional IT service provider in Europe specializing in innovative software on-demand and outsourcing solutions for diverse business needs.”
First Line Outsourcing
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Our areas of expertise encompass: ✅ Customized panels and plugins for Adobe, Avid, and DaVinci—designing tools to enhance and speed up your video production workflow, either by modifying existing platforms or creating entirely new solutions from the ground up. ✅ Mobile application development—cr
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Paris, Ile De France, Fr
Services Provided+1 Services
15% Custom Web Application Development
25% Mobile App Development (iOS & Android)
10% API Development & Integration
35% AI Strategy & Roadmap Consulting
AI Summary
“First Line Outsourcing delivers customized software solutions, including cross-platform mobile apps, Telegram mini apps, and creative workflow tools, enhancing performance across media, fintech, and education sectors.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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