Rainier Sapin

I'm a full-stack developer based in Pampanga, Philippines, with around 3 years of hands-on coding experience and a focus on building reliable, production-ready web applications.

During my internship at Information Technology Business Solutions Corp., I worked on a real enterprise accounting system — developing financial tracking modules for Project Costing workflows using PHP, PostgreSQL, and JavaScript, shipping 15+ UI mockups into working full-stack features, and collaborating with a professional team through code reviews, Git, and agile practices.

Outside of that, I've independently built and deployed two live applications: PulseCheck, an uptime monitoring and incident management platform (Laravel, Vue.js, TypeScript, Docker, DigitalOcean), and CodeSnap, a code snippet manager with syntax highlighting and PNG export (Next.js 14, TypeScript, Supabase, Vercel). I also completed a freelance engagement where I independently built a Document Requisition System with Gemini AI integration for a university client over five months.

My primary stack is Next.js, Laravel, Node.js, TypeScript, and PostgreSQL. I'm currently deepening my skills in LLM integration, RAG, and AI automation using the Gemini API and n8n.

I'm looking for remote full-stack or backend roles where I can contribute real work from day one, keep learning from experienced developers, and grow toward AI integration development.