About

johnnyji.dev is a small collection of practical calculators and notes for people who build software, automate workflows, and think carefully about trading risk.

The site focuses on transparent calculations: average entry price, DCA planning, trading fee break-even levels, position sizing, API usage, and side project operating costs. Each page shows the formula and the assumptions behind the result so the number is easy to audit.

The project is maintained by johnnyji, a software engineer based in Seoul, South Korea. The content is educational and is not financial, investment, tax, legal, or accounting advice.