System Engineer learning through the design, implementation, and operation of personal projects.

I focus on understanding how a feature should behave before deciding how it should be implemented.
I use AI to accelerate implementation, but architecture, review, and final decisions remain my responsibility.

A visual workspace for organizing scattered ideas on a board.

KyuBoard supports rich text memos, images, Mermaid diagrams, tables, and free drawing.
Board contents can be organized spatially and compiled into a single Markdown document.

The project is also used to study:

• interaction design across desktop, tablet, and mobile
• pointer events, canvas navigation, and card-based interfaces
• authentication and session management
• database design and migrations
• automated testing with Vitest and Playwright
• AI-assisted board editing

A lightweight version of KyuBoard built around browser storage.

It removes the external database and image-storage dependencies so that the core board workflow can be examined and used more easily.

• Design the behavior before implementing the details.
• Prefer structures that fit the project over abstract best practices.
• Keep duplicated code when explicit ownership is clearer than forced abstraction.
• Use documentation and tests to preserve decisions made during development.
• Treat AI as an implementation tool, not a substitute for technical judgment.

• Stabilizing KyuBoard through automated tests
• Expanding AI-assisted board operations

Java C# Python JavaScript TypeScript Spring boot ASP.Net React Next.js Oracle Database My SQL SQL Server PostgreSQL Docker Vitest Playwright GitHub Actions