David Bui

I specialize in building, maintaining, and scaling robust management systems that streamline business workflows. Whether you need to breathe new life into a legacy system or build a custom software tool from scratch, I provide end-to-end technical excellence.
How I can help your business:
System Maintenance & Legacy Modernization: Debugging and upgrading existing C# or PHP systems to ensure peak performance.
Custom Management Tools: Developing tailored CRM, ERP, or internal inventory tools using SQL Server/MySQL.
Cross-Platform Mobile Apps: Building high-performance Android & iOS apps using React Native (Expo) to keep your business on the move.
Responsive Web Development: Modern, fast-loading interfaces with HTML5, CSS3, and JavaScript.
Tech Stack:
Backend: C# (.NET), PHP
Database: SQL Server, MySQL
Mobile: React Native (Expo)
Frontend: HTML/CSS, JavaScript (ES6+)
I don't just write code; I build tools that help your business grow. Let’s jump on a quick call to discuss your project!