Joyce - Senior Full Stack Engineer

JONA JOYCE S. SAN PASCUAL

Full Stack Engineer • AI, LLM Integration

Senior Full Stack Engineer
→ AI-Powered Development

Sr. Full Stack Engineer with 9+ years total experience, 6+ years at senior level. Shipping scalable web and mobile applications. Recently exploring LLM integration, prompt engineering, and AI workflows. Building with emerging AI technologies while leveraging full-stack expertise.

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COMPETENCIES
ReactFlutterNode.jsLLMsRAGMCPPrompt EngineeringFull Stack

Ask Me Anything

This site uses RAG to answer questions about my experience, R&D work, and AI engineering principles.

AI
Portfolio Assistant
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Powered by Claude 4.5 Haiku
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Hi! I'm Joyce's AI assistant. Ask me anything about their experience, R&D work, or AI engineering principles.

03:51 AM
ARCHITECTURE

How This Works

This portfolio site demonstrates RAG (Retrieval-Augmented Generation) in action.

01

You Ask

Type a question about my experience, R&D work, or AI engineering principles.

02

RAG Retrieval

The system retrieves relevant information from my resume and knowledge base.

03

Claude Responds

Claude AI generates a natural, contextual answer based on retrieved information.

Why RAG?

  • ✓Accurate information grounded in real data (my resume & experience)
  • ✓No hallucinations or made-up credentials
  • ✓Shows understanding of a critical AI pattern used in production systems

TECHNICAL NOTE

This site uses Claude's API with secure backend handling. Your questions are processed server-side.

Projects & Work

I've worked on 15+ production projects throughout my career. Below are the most notable ones demonstrating technical depth and impact.

AI-Powered Portfolio Website

Featured

Full-stack RAG system demonstrating production-grade AI implementation. Built with Next.js frontend and Claude API backend, featuring semantic retrieval, rate limiting, and secure API key management.

Tech Stack

Next.js, React, Claude API, RAG, Tailwind CSS, Vercel

Impact

Live portfolio showcasing practical RAG implementation with semantic search and cost optimization

Key Features
  • Implemented RAG (Retrieval-Augmented Generation) with semantic retrieval
  • Secure backend with rate limiting and API key protection
  • Knowledge base pipeline demonstrating practical AI patterns

Social Discovery Platform with AI Chat (2026)

Cross-platform mobile app combining social discovery with location-based nearby friends feature. Integrated AI-powered chat assistant using Anthropic API for intelligent conversational features. Designed real-time chat system with push notifications and instant message delivery across iOS and Android.

Tech Stack

React Native, Supabase, Node.js, Claude API, Real-time Database, Push Notifications

Impact

Feature-rich social platform with AI-enhanced user interactions and real-time capabilities

Key Features
  • Integrated Anthropic API for AI-powered chat assistant
  • Location-based geolocation with real-time nearby friends discovery
  • Real-time messaging with instant push notifications
  • Cross-platform deployment (iOS, Android)

Multi-Platform Services Marketplace (2025)

Complete marketplace ecosystem with separate customer and provider mobile apps, plus back-office portal. Designed complex payment processing and disbursement system handling service transactions and provider payouts. Implemented backend job processing with webhooks and async tasks for reliable transaction handling and settlement.

Tech Stack

Flutter, Node.js, PHP/Laravel, Directus CMS, Payment Gateway API, PostgreSQL

Impact

Full-stack marketplace platform handling complex payment flows and multi-stakeholder coordination

Key Features
  • Multi-platform ecosystem (iOS, Android, Web portal)
  • Complex payment processing with disbursement system for provider payouts
  • Backend job processing, webhooks, and async task handling
  • Multi-stakeholder coordination and role-based access

NFT Marketplace Platform (2023)

NFT marketplace with blockchain payment integration. Rapidly learned and integrated emerging Web3 technology (Web3.js, smart contracts) to deliver production system. Designed complex payment flow integrating blockchain transactions with traditional database for inventory and order management. Demonstrates ability to learn and ship with emerging technologies under uncertainty.

Tech Stack

React, Node.js, Web3.js, Smart Contracts, PostgreSQL

Impact

Production system processing on-chain transactions with multiple concurrent users, showing adaptability to emerging tech

Key Features
  • Rapidly learned and shipped emerging blockchain technology
  • Integrated Web3.js and smart contracts with traditional backend
  • Complex payment flow handling both on-chain and off-chain transactions
  • Production reliability with concurrent user support