ChangKuiXu

Independent Full-Stack & AI Developer

Self Employed • Freelance

Jan 2012 - Present • 14 yrs 8 mos

I am an independent Full-Stack and AI Developer with 20+ years of practical software development experience. I design, develop, deploy, and maintain production-ready web applications, SaaS platforms, APIs, and AI-powered applications. My core expertise includes C#, ASP.NET Core, ASP.NET MVC, Razor Pages, Web API, REST APIs, PostgreSQL, SQL Server, SQLite, JavaScript, Entity Framework, and database design. I also have extensive hands-on experience integrating AI and large language model APIs into web applications, including AI-powered text, image, video, translation, content generation, and automation workflows. My responsibilities cover the complete software development lifecycle, including product planning, system architecture, backend and frontend development, database design, API integration, authentication, membership systems, payment integration, performance optimization, troubleshooting, and production deployment. I deploy and maintain applications on both Linux and Windows servers and have practical experience with Ubuntu, Nginx, Kestrel, IIS, systemd, SSL, DNS, Cloudflare, PostgreSQL, and production server troubleshooting. I focus on reliable, maintainable, and production-ready solutions and work independently from initial requirements through development, deployment, and ongoing maintenance.