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A practical growth loop for early products

Early growth gets clearer when treated as a learning loop, not a channel checklist. Start with one painful use case and a narrow audience. Then run small experiments that produce real conversations: a useful guide, a focused landing page, a lightweight tool, or a hands-on onboarding session. Track the signals that show learning: repeated customer language, activation, retention, and the…

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Database Isolation: Why Two Committed Transfers Can Create Money

Two wallet transfers can both commit successfully while creating money. In Lab 08, the problem is a specific query pattern: read a balance, validate it in Go, calculate a replacement value, and write…

  • Two committed transfers can create money simultaneously
  • TransferNaive implementation uses sql.LevelReadCommitted
  • Lost update vulnerability arises from query pattern

Union-Find: The Matrix of Disjoint Sets

The Quest Begins (The "Why") I still remember the first time I stared at a LeetCode problem that asked me to count how many separate groups of friends existed in a social network.

  • Union-Find treats elements as disjoint sets with a root representative.
  • Union by rank/size and path compression optimize Union-Find performance.
  • Union-Find provides near-constant time complexity for union and find operations.

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