Skip to content
jongminchung

Where should we begin?

Explore projects, engineering notes, and research in one place.

Read the work Open Engineering Notes
View projectsRead recent notes

SELECTED WORK / 2026

Things built to be read.

01Technology publication

Engineering Notes

Bilingual articles, handbooks, and deep dives about building understandable software.

  • Next.js
  • MDX
  • Engineering
02Investment research

Investment Notes

13F filings and original investment sources analyzed with reported facts kept separate from interpretation.

  • Research
  • Sources
  • Bilingual

LATEST WRITING

Recent notes.

The latest engineering and investment notes, ready to read.

Engineering Notes

2026-08-28Coding Tests Start with Input Size2026-07-20Server Monitoring Analysis Guide2026-07-12The Browser's Main Thread Is Expensive

Investment Notes

2026-08-29Reading the market through an investor's eyes2026-08-29The craft and philosophy of finding market leaders2026-08-29Testing the financial health of market leaders

README / HOW I WORK

Working principles.

Align language, clarify boundaries, and verify change.

  1. 01

    Language is architecture.

    Meetings, issues, APIs, and tests should use the same words.

  2. 02

    Boundaries earn their keep.

    External values are translated before an internal model trusts them.

  3. 03

    Evidence ships with change.

    Tests make intent observable and keep the cost of change inside its boundary.