Projects

Stock Auto Trading System

2025-01 ~ Present · Full Stack

Automated stock trading system using Python and brokerage APIs. Fully automated from technical indicator signal generation to order execution.

  • Automated signal generation with technical indicators (MA, RSI, MACD)
  • Backtesting engine for pre-validating strategies
  • Portfolio monitoring and trade alerts via LINE Notify
  • Stable 24/7 operation with Docker containers
Python PostgreSQL Docker GitHub Actions

Portfolio Site

2026-05 ~ Present · Full Stack

This site, built with Astro + Cloudflare Pages. Running at near-zero monthly cost.

  • Minimized JS via Astro island architecture
  • Near-zero infrastructure cost on Cloudflare free tier
  • RAW to WebP conversion pipeline using Sharp
  • Japanese/English bilingual with Astro built-in i18n
Astro TypeScript Tailwind CSS Cloudflare Pages Cloudflare R2

Production Management System

2023-04 ~ 2025-03 · Backend Lead

Designed and developed a production management system for manufacturing. Unified process management, inventory control, and shipping management.

  • Unified process, inventory, and shipping management in one system
  • Real-time inventory tracking with barcode reader integration
  • Optimized batch processing, reducing daily aggregation by 70%
  • Supported gradual migration from legacy Excel-based operations
Java Spring Boot PostgreSQL React Docker

Business Efficiency with RPA

2022-07 ~ 2023-03 · RPA Developer

Automated routine tasks using UiPath. Automated data entry, report generation, and email handling, saving hundreds of work hours annually.

  • Fully automated 10+ routine tasks with UiPath
  • Achieved over 600 hours of annual labor savings
  • Improved maintainability with operation manuals for non-engineers
  • Enabled unattended operation with error handling and notifications
UiPath Python VBA SQL Server

Tech Stack

Languages

TypeScript TypeScript
Python Python
Go Go

Frameworks

Astro Astro
React React
Tailwind CSS Tailwind CSS
FastAPI FastAPI

Infrastructure

AWS AWS
Cloudflare Cloudflare
Kubernetes Kubernetes
Terraform Terraform
Docker Docker

Tools

GitHub Actions GitHub Actions
PostgreSQL PostgreSQL
Redis Redis

Career

  1. Senior Systems Engineer

    Current Company

    2022-04 ~ Present

  2. Systems Engineer

    Previous Company

    2018-04 ~ 2022-03