Australia's Leading Custom Software, Apps, Integration & Database Developer

Your Custom API Development Partner

Unlock Unprecedented Efficiency with Streamlined APIs

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Unlock Unprecedented Efficiency & Innovation with Custom APIs

Imagine a world where your business systems seamlessly communicate, data flows effortlessly, and processes are automated for peak efficiency. That's the power of custom API development, and it's within your reach with C9's expert team of Australian API developers.

We specialise in crafting custom APIs that unlock the full potential of your business, whether you're seeking to:

  • Streamline operations and eliminate manual tasks
  • Integrate disparate systems for a unified experience
  • Enhance customer experience through personalized interactions
  • Drive innovation and accelerate time-to-market
  • Gain a competitive edge in a rapidly evolving digital landscape

Forget about clunky workarounds and disconnected systems. Our team will work closely with you to understand your unique business challenges and goals, designing and developing APIs that deliver tangible results:

Custom-Built APIs for Seamless Connectivity in Australia

Our expert API developers in Australia deliver original, well-structured APIs tailored to your needs for seamless connectivity between applications and optimal performance of integrated systems.

Custom Mobile APIs for Security

Our expert API developers in Australia build high-performing, secure mobile APIs tailored to your app and cloud integration needs, handling transactions and data transfers with ease.

Custom Web APIs for Scalability

Our expert API developers in Australia leverage REST and ROA architecture styles to build customizable, scalable web APIs for your mashups, social media integration, and other web-based API needs.

Connect Your Business to a World of Possibilities with Expert API Development

Empower your Brisbane business with seamless data exchange and functionality expansion through our powerful API development services. Forget about siloed systems and clunky workarounds. Our skilled API developers bridge the gap between your existing infrastructure and the vast opportunities of the digital landscape.

Unleash Your Business Potential with Secure & Scalable Cloud API Development

Our expert API developers create custom cloud-based APIs that bridge the gap between your on-premise tools and the limitless possibilities of the cloud. Imagine streamlining workflows, automating tasks, and unlocking a wealth of data-driven insights – all thanks to the power of APIs.

Future-proof Your Business with Proactive API Consulting & Development

Is your business trapped in a siloed world of disconnected systems? Are clunky integrations and data bottlenecks holding you back? You're not alone. In today's digital landscape, a well-defined API strategy is essential for seamless data flow, efficient operations, and unlocking new business opportunities.


What Our Clients Say

Hear from business owners and executives who have trusted us to build their custom software solutions. 

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“We have been working with C9 for close to 3 years. During this time C9 have helped us develop and maintain our website to our needs in a professional manner. They assisted with our online application process resulting in a streamlined process for our online customers. C9 has produced a cost effective solution to meeting our online sales and exposure.”

Phil McMaster, Director - Car Loan Xpress

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"C9 is a very capable web design and technology company with a vibrant and enthusiastic team. In my experience C9 provide innovative & creative solutions, a high level of customer service and excellent communication. I find C9 to be very reliable and accessible. The team at C9 has a strong awareness of an individual’s needs, how to optimise growth potential and the evolving needs of a strong web presence. I highly recommend C9."

CARLTON COX, Owner - &

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"C9 updated and upgraded our rusty old site to a more user friendly format. Our site is unique with international clients and visitors, capturing book sales orders from around the world, proprietary site newsletter capabilities, and a large volume of past articles and newsletters. Ongoing support has been very good. Marcus Eddy is thorough and professional, and a pleasure to work with."

DAVID TANZER, International Lawyer Owner & Director - David A Tanzer & Associates, PC


Trusted by Some of the

Australia's Leading Businesses.

See who we've helped build successful custom software solutions for.

Price Waterhouse Cooper
Rud Group
Australis Asset Advisory Group
Delta Panels
Inner Range
Brisbane Markets Limited
Avocados Australia
Sulzer Group
Commercial Radios Australia
CSIRO Data 61
Compare the Market
University of Queensland
Professional Hospitality
ISG Funds
Bonney Group
Specialist Electrical Solutions
Projects & Case Studies Monitor

We Believe Our Work Speaks for Itself. 

See how we've helped businesses of all sizes achieve their goals with custom software solutions.

Our Work

Create Custom APIs to Power Your Business 

Schedule a free consultation to learn more about how our team of experienced software developers can help you create custom APIs that meet your specific needs and help you achieve your business goals.

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The C9 Advantage

C9 is dedicated to delivering high-return projects, and we take pride in our client’s long-term loyalty. This is a testament to our quality, professionalism, and the exceptional experience you can expect when working with us.

  • Customised approach
  • Expert Team
  • End-to-end Services
  • Focus on User Experience
  • Ongoing support and maintenance
  • Proven Results 
  • Exceptional Experience
  • Customer-First Mindset

Start Your Project

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  • 16+



API Development FAQ: Get Answers to Your Questions

We use OpenAPI specifications to design intuitive, consistent APIs and validate them against abuse cases. Security is built-in via OAuth, SSL, role-based access, etc.

Each API includes comprehensive documentation, tutorials, sample code, and postman collections. We also provide SLA-driven support, monitoring, and maintenance.

Yes, we have extensive experience building secure, scalable APIs for internal systems integration as well as third-party developer consumption according to use case requirements.

Unlock the
Power of Your Data

Our team of experts can help you develop APIs that will allow you to securely and efficiently share your data with other applications and systems, enabling you to automate workflows, streamline processes, and gain new insights.