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

AugmentX Solutions Limited
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AugmentX Solutions Limited is a consulting firm located in the UK, specializing in SAP digital transformation and intelligent automation powered by AI. We assist businesses in modernizing and optimizing their operations through our expert SAP solutions and AI-driven automation. Our combined emphasis
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
London, England, Gb
Services Provided+7 Services
3% Other IT Consulting and SI
4% AI-Powered Document Processing
3% Cloud Consulting & SI
4% AI Strategy & Roadmap Consulting
AI Summary
“AugmentX Solutions Limited, a UK consulting firm, specializes in SAP digital transformation and AI-driven automation, delivering agile, cost-effective solutions to optimize and modernize mid-market businesses.”
Sigma Square
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Sigma Square has over 13 years of experience in providing robust WordPress and tailored web solutions, designed for optimal performance, security, and long-term growth. Our process is straightforward: we start by understanding your business, then design the ideal solution, and finally produce clean,
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
60% Custom Web Application Development
25% API Development & Integration
15% E-Commerce Development
AI Summary
“Sigma Square delivers tailored WordPress and web solutions with expertise in custom development, front-end and back-end technologies, scalable e-commerce, and robust, long-term performance.”
Coding Agency
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Coding Agency creates bespoke software solutions for businesses that have outgrown conventional tools. Our expertise lies in Laravel-based applications, scalable SaaS platforms, API integrations, and essential business applications designed to align with your workflow. We focus on delivering straigh
Highlights
$5,000+
Min Project Size
2-9
Employees
Services Provided
60% Custom Web Application Development
15% Mobile App Development (iOS & Android)
25% API Development & Integration
AI Summary
“Coding Agency, based in the Netherlands, delivers scalable, secure Laravel-based software solutions and API integrations tailored to businesses seeking maintainable, growth-oriented digital products.”
DevNovium
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Welcome to DevNovium, a quickly expanding software development firm dedicated to providing outstanding, customized software solutions that cater to your specific needs. Our enthusiastic team of developers prioritizes accuracy, scalability, and efficiency in every project we handle. We are committed
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
25% API Development & Integration
60% Custom Web Application Development
15% Legacy System Modernization
AI Summary
“DevNovium is a growing software development firm specializing in customized, scalable, and efficient solutions, committed to quality and lasting client partnerships across diverse industries.”
Neuramonks
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NeuraMonks – 𝘼𝙄 𝙎𝙤𝙡𝙪𝙩𝙞𝙤𝙣𝙨 That Deliver Tangible Business Outcomes NeuraMonks is a reliable AI development firm providing tailored AI solutions for companies focused on implementation rather than trial and error. We offer comprehensive 𝘼𝙄 𝙨𝙚𝙧𝙫𝙞𝙘𝙚𝙨 — covering everything from strat
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Ahmedabad, Gujarat, In
Services Provided+5 Services
8% AI Strategy & Roadmap Consulting
8% LLM Integration & Prompt Engineering
7% Custom AI Chatbot Development
10% Machine Learning Model Development
AI Summary
“NeuraMonks is a reliable AI development firm offering tailored, scalable AI solutions from strategy to deployment, enabling seamless integration and measurable business outcomes across industries.”
Sarvadhnya Clouds
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Sarvadhnya Clouds provides innovative technology solutions that revolutionize businesses, ranging from algorithmic trading to enterprise solutions. We focus on developing customized trading algorithms, mobile applications, web applications, and digital transformation strategies. 1. **Algorithmic T
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
30% API Development & Integration
40% Custom Web Application Development
25% Mobile App Development (iOS & Android)
5% E-Commerce Development
AI Summary
“Sarvadhnya Clouds delivers tailored technology solutions across algorithmic trading, web and mobile applications, enterprise systems, and IT outsourcing, driving digital transformation and business innovation.”
APPiLY Technologies
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ABOUT US We are a leading web and mobile app development firm located in Bangalore. Since our founding in 2014, we have provided exceptional application development services to clients around the globe. With a decade of experience, we have honed our technical skills and established a strong projec
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Bengaluru, Karnataka, In
Services Provided+1 Services
35% Mobile App Development (iOS & Android)
15% E-Commerce Development
20% API Development & Integration
25% Custom Web Application Development
AI Summary
“APPiLY Technologies, based in Bangalore since 2014, specializes in web and mobile app development delivering digital transformation solutions globally with advanced technical expertise across diverse industries.”
CleverLabs
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CleverLabs is a global software engineering firm based in Warsaw, Poland, with research and development offices located in Estonia and Kazakhstan. Our team consists of 50 in-house full-stack engineers, boasting over a decade of experience. We focus on custom web development and high-load API solutio
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Warszawa, Masovian, Pl
Services Provided+1 Services
30% Custom Web Application Development
18% API Development & Integration
2% Blockchain & Web3 Development
40% Generative AI
AI Summary
“CleverLabs is a global software engineering firm specializing in custom web development, high-load APIs, and integrations across logistics, fintech, healthcare, and blockchain industries with proven expertise.”
DreamX
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Dream X is a top-tier full-cycle engineering partner that provides dependable technical solutions for businesses. While many firms emphasize design, we focus on architecture and scalability. Our expertise lies in converting intricate business challenges into effective digital ecosystems. With experi
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
San Francisco, California, Us
Services Provided+2 Services
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
20% API Development & Integration
25% Backend Development
AI Summary
“Dream X delivers comprehensive engineering solutions, specializing in scalable architecture and digital ecosystems across 15+ industries, ensuring reliable, high-performance software as a strategic business asset.”
Big Light Studio
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Big Light Studio assists emerging businesses in navigating technical complexities. We offer part-time CTO and engineering leadership services to startups and expanding teams seeking strategic guidance, modernization, or delivery assistance. Our approach combines business acumen with technical expert
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
Essex Junction, Vermont, Us
Services Provided
25% API Development & Integration
25% Cloud Consulting & SI
25% DevOps Engineering
25% Operational Process Consulting
AI Summary
“Big Light Studio provides part-time CTO and engineering leadership to startups, offering strategic guidance and technical expertise for scalable, reliable, and high-performance platform development.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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