I’m a full-stack software engineer currently based in Osaka, Japan. When I’m not architecting web backends or building React interfaces, you’ll usually find me dissecting game mechanics in survival-horror titles or passing time working through complex logic puzzles.

Having spent years designing interactive learning tools & realia and facilitating professionals in multicultural communication, I've always been fascinated by the challenge of crafting experiences that engage one's curiosity. Today, I bring that exact mindset to web development by exercising the intersection between the art of puzzle-solving and providing fulfilling user outcomes. I love taking head-scratching technical problems, and structuring software in ways that turn them into responsive, felt experiences that stimulate one's own intuition along with task fulfillment.

Enterprise-Grade Real-Time Game Localization & LQA Triage Monorepo

_{🎮 16:9 Cockpit Preview — Real-time localization triage, slide-out string inspector, and character limit hazard gauges.}

• Tech Stack: TypeScript (~6.0) • NestJS v12 • React 19 • Socket.io • PostgreSQL 16 • Prisma 7 • Tailwind CSS v4 • Docker • pnpm Workspaces
• Architecture & Highlights:
  • Unified Monorepo: Strict pnpm workspace sharing compile-time TypeScript DTOs and contracts between NestJS backend and React frontend.
  • Real-Time Duplex Gateway: Low-latency Socket.io triage messaging, presence tracking, and active typing indicators.
  • Relational LocString Parsing: Automated regex detection (#LOC-*, $STR_*) linking dialog and UI strings directly to PostgreSQL.
  • Inspector Drawer & Hazard Gauges: Dynamic character limit gauges preventing localized UI text clipping, sub-millisecond canonical glossary termbase, and strict RBAC approvals (LOC_PM, SOLUTIONS_DEV).
  • Zero-Reflow Bilingual Engine: Instant EN/JA toggle with 100% compile-time dictionary parity across 228 strictly-typed keys.
• 🚀 Explore Live Demo • 📦 GitHub Repository • 🏛️ System Architecture • 日本語ドキュメント

Production Community Portal & Authenticated Marketplace

🏛️ Portal Hub & Guidebook	🛒 Community Marketplace (Live Triage)

_{📢 Left: Municipal information portal & guidebook • Right: Authenticated marketplace with on-the-fly Sharp image compression.}

• Tech Stack: Node.js • Express • EJS • PostgreSQL • Prisma ORM • Supabase Storage • Railway • Multer • Sharp
• Architecture & Highlights:
  • Production Deployment: Active one-stop portal and verified marketplace serving municipal civil servants and foreign educators in Sennan City.
  • In-Memory Image Optimization: Automated Multer + Sharp compression pipeline processing uploads directly in server memory, slashing storage footprints by 70%+ without client-side lag.
  • Relational Schema Integrity: Prisma ORM managing user auth, item reservation lifecycles, and public community noticeboards.
• 🚀 Explore Live App • 📦 GitHub Repository • English Documentation • 日本語ドキュメント

Asynchronous E-Commerce Scraping & Event Daemon

• Tech Stack: Python 3.12+ • Playwright Async • Pydantic v2 • SQLite (WAL) • Discord Webhooks • Pytest • uv
• Engineering Highlight: Architected an asynchronous event-driven daemon featuring decoupled strategy extractors for Japanese retail DOMs (Tsukumo, Dospara, PC One's) and an asyncio.Queue single-writer actor pattern preventing SQLite write locks. Validated with 160 hermetic tests running in <0.6s.
• 📦 GitHub Repository • English Documentation • 日本語ドキュメント

Containerized Food Diary & Automated CI/CD Pipeline

• Tech Stack: Next.js • TypeScript • React • PostgreSQL • Prisma ORM • Docker • GitHub Actions • Framer Motion
• Engineering Highlight: Packaged a full-stack Next.js application and relational database with Docker Compose, automated through GitHub Actions CI/CD to build and publish production images to GitHub Container Registry (GHCR).
• 🚀 Live App • 📦 GitHub Repository • English Documentation • 日本語ドキュメント

Interactive Anti-Bot Visual Verification Middleware

• Tech Stack: JavaScript (ES6+) • Express • React • HTML5/CSS3 • MongoDB • Prisma ORM • Supabase • Railway
• Engineering Highlight: Built custom security middleware utilizing a dynamic 3x3 image grid system. Replaced static captcha checks with instant, stateful visual feedback to optimize user interaction while maintaining security integrity.
• 🚀 Live App • 📦 GitHub Repository • English Documentation • 日本語ドキュメント

Cloud Storage & File Management Platform

• Tech Stack: Node.js • Express • JavaScript (ES6+) • Database Storage • Railway
• Engineering Highlight: Designed a full-stack file management system supporting multipart file uploads, recursive folder hierarchy management, and dynamic database querying.
• 🚀 Live App • 📦 GitHub Repository • English Documentation • 日本語ドキュメント

• Interactive Learning Tooling & Digital Media | JET Programme (~5 yrs)

  • Automation & Tools: Developed local interactive web applications & activities, programmable quiz tools, and digital-to-physical mapping assets that modernized lesson frameworks, leading to city-wide adoption across Japanese schools in the municipality.
  • Project Leadership: Spearheaded internationalization community initiatives (including an interactive puzzle-mystery activity for a 300+ participant event) and engineered objective-based programs focused on active problem-solving strategies.

• Technical Program Delivery & Enterprise Solutions | Corporate Specialist (~3 yrs)

  • Client Solution Engineering: Scoped and delivered custom technical training frameworks for enterprise clients (e.g., Accenture, Toyota), aligning complex operational requirements with strict SLA milestones.
  • Data & Assessment Pipelines: Managed standardized evaluation workflows and benchmarked diagnostic assessment data pipelines for 200+ corporate stakeholders.

• JLPT N2 Certified: Capable in reading Japanese technical documentation, navigating local systems, and translating deliverables.
• Native English & Filipino: Full professional fluency in English and Filipino work environments.
• Cross-Cultural Technical Communication: Experienced in facilitating requirement gathering, specification handoffs, and documentation reviews between English and Japanese teams.