About a year ago I wrote about product development with AI. One point now needs to be updated, so I am adding this note.

I share what I learned from attending RubyKaigi 2025 with my family as a manager of an engineering organization.

Since my children are getting older and there will be less reason to use a child-carrying bicycle, I bought a fixed-gear bicycle. This is a record of what I bought and how I customized it.

We are introducing AI-based writing correction into a product under development. Through quality checks comparing AI and humans directly, I recognized both AI's limits and human strengths.

This article is inspired by the Kaigi on Rails 2024 closing keynote on wholeness, repairing, and having fun, but it develops a different argument through Christopher Alexander, Gilles Clément, Hiroki Azuma, the Ethereum Foundation, and Robert Pirsig.