Unit 6·Tesujiてすじ

Building at Tightly

The craft of building an AI-powered supply chain product: how the forecasting engine works and should be evaluated, what a principled 12-month roadmap looks like, and the PM methods that actually fit a team of under 30 people building software where mistakes have real financial consequences.

Tesuji — the Go analogy for this unit

Tesuji is the clever local move that solves a tactical problem — the unexpected sequence that captures stones, creates territory, or turns a losing position around. In product development, tesuji is the specific technical or methodological choice that makes the product distinctively good: not just 'we use AI' but the precise evaluation method or design pattern that makes the forecast 12% more accurate than the next tool.

3 lessons·75 XP total
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Tightly's data science team says: 'We improved MAPE by 6 points on our test set.' A PM asks: 'Was this evaluated against a naive seasonal baseline?' Why is that the right question?