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

Overzoom srl
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Overzoom differentiates itself by providing three main services: customized software development, system integration, and expert consulting. We merge state-of-the-art technology with our fundamental values—innovation, passion, strength, and dedication—to create high-quality software that realizes yo
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Andria, Apulia, It
Services Provided
15% API Development & Integration
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
50% ERP Consulting and SI
AI Summary
“Overzoom srl specializes in customized software development, system integration, and consulting, combining advanced technology with strategic innovation to deliver high-quality, future-ready digital solutions.”
Irusri Group AB
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Irusri Group provides high-quality and affordable IT services to businesses and organizations. Our skilled development team in Sri Lanka allows us to deliver budget-friendly solutions to our clients. Additionally, Irusri Group supports the Global Goals/Agenda (SDGs) 2030 by generating more employmen
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Umea, Vasterbotten, Se
Services Provided
15% API Development & Integration
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
50% IT Staff Augmentation
AI Summary
“Irusri Group AB delivers affordable, high-quality IT services through its skilled Sri Lankan team, promoting sustainable employment and safe working conditions aligned with SDGs 2030.”
Neocoast
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We are a software development partner that specializes in educational technology (EdTech), assisting companies in creating and expanding platforms utilized by students, educators, and institutions in K-12 and higher education. With over a decade of experience in EdTech and more than 80 projects comp
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Montevideo, Montevideo, Uy
Services Provided+5 Services
13% API Development & Integration
7% Mobile App Development (iOS & Android)
20% SaaS Product Development
10% Custom Web Application Development
AI Summary
“Neocoast specializes in developing compliant, scalable EdTech platforms for K-12 and higher education, integrating LMS/SIS systems, ensuring data privacy, and enhancing learning through AI-driven solutions.”
Krishiva Tech
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Krishiva Tech - Premier Mobile App and Software Development Firm. Krishiva Tech is a results-oriented, fundamental IT company that provides distinctive, dependable, and cutting-edge software solutions to businesses of all sizes, utilizing an agile methodology for swift software delivery. Our team e
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
30% Custom Web Application Development
40% Mobile App Development (iOS & Android)
20% API Development & Integration
10% E-Commerce Development
AI Summary
“Krishiva Tech is a leading IT firm specializing in custom software, product development, and maintenance, delivering innovative, reliable digital solutions with agile practices to support diverse businesses.”
iTSystems
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Since 2010, iTSystems has served as a reliable partner for businesses in search of innovative solutions utilizing Microsoft technologies. As a Microsoft Gold Partner in both Application Development and Application Integration, we provide expertise and access to cutting-edge tools and resources to he
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Montevideo, Montevideo, Uy
Services Provided+4 Services
8% Legacy System Modernization
18% API Development & Integration
25% Custom Web Application Development
12% Generative AI
AI Summary
“iTSystems, a Microsoft Gold Partner since 2010, specializes in custom application development, data analytics, AI solutions, and staff augmentation to enhance business performance and growth.”
Eons Soft Tech
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Eons Soft Tech, located in Ahmedabad, India, is a rapidly growing provider of IT solutions focused on delivering state-of-the-art digital services for businesses around the globe. Our strong in-house team of talented professionals excels in delivering innovative, scalable solutions to address both y
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
हीर, Gujarat, In
Services Provided+1 Services
15% API Development & Integration
30% Custom Web Application Development
25% Mobile App Development (iOS & Android)
20% E-Commerce Development
AI Summary
“Eons Soft Tech delivers innovative IT solutions, including web, mobile, and cloud development, combining cutting-edge technologies to support global businesses with secure, scalable, and customized services.”
NG Code Lab Pvt Ltd
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NG Code Lab is your trusted partner in developing websites, software, and mobile applications, focusing on crafting innovative solutions that meet your business requirements. Our goal is to provide you with advanced technology and professional support, helping you thrive from the initial idea to the
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Sujanpur Tihra, Himachal Pradesh, In
Services Provided
35% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% API Development & Integration
15% E-Commerce Development
AI Summary
“NG Code Lab Pvt Ltd offers professional website, software, and mobile app development services, delivering innovative technology solutions and dedicated support to meet diverse business needs.”
SCALER Software Solutions
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### About Scaler Scaler – Your Partner in Software Development Focused on FinTech Based in Eastern Europe, Scaler is a software agency that assists fast-growing scale-ups and innovation-driven companies to enhance their development capabilities without the delays and costs associated with in-hous
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Budapest, Budapest, Hu
Services Provided+5 Services
13% API Development & Integration
5% Legacy System Modernization
8% Frontend Development
5% Mobile App Development (iOS & Android)
AI Summary
“Scaler Software Solutions is an Eastern European agency specializing in FinTech software development, providing swift access to skilled EU-based engineers for regulated, innovative industries with transparent and cost-effective services.”
CodeWheel AI
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CodeWheel AI is an AI consulting firm prioritizing security, led by a seasoned engineer with over 15 years of experience. I specialize in creating robust AI platforms, including Retrieval-Augmented Generation (RAG) systems, automated agent workflows, vector search capabilities, and scalable multi-te
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Services Provided+3 Services
12% AI Agent & Multi-Agent System Development
3% AI Strategy & Roadmap Consulting
5% Custom AI Chatbot Development
14% AI Model Fine-Tuning & Training
AI Summary
“CodeWheel AI delivers secure, scalable AI consulting services specializing in robust platform development, secure RAG and agent workflows, multi-tenant SaaS architectures, and comprehensive AI security assessments.”
CoreByte Teknoloji ve Yazilim Gelistirme
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At CoreByte, our skilled team, proficient in various technologies, delivers solutions tailored to fulfill your company's web-based software requirements. Propel your business into the future with our innovative offerings in diverse areas, including stock and order management, custom e-commerce platf
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Izmir, Izmir, Tr
Services Provided+1 Services
17% API Development & Integration
12% Custom Web Application Development
5% E-Commerce Development
33% Go-to-Market Strategy
AI Summary
“CoreByte delivers tailored web-based software solutions, specializing in e-commerce, order management, API integrations, and digital transformation to drive business innovation and efficiency.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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