CodeZug

Primary CS tools are either toys without progression or pro IDEs that crush 8-year-olds. Teachers had no single track from typing to real Python that fit a 45-minute lesson.

1. 01Designed a six-station 'train line' curriculum mapped to Lehrplan 21, with XP and tokens flowing through a single ledger so every activity reinforces the next.
2. 02Embedded a full CPython 3.11 runtime in the browser via Pyodide so students write real Python with zero install — runnable on a school Chromebook offline.
3. 03Built 33 Postgres tables with strict RLS for classes, teachers, students and parents, plus atomic XP/token transactions to prevent race-condition cheating.
4. 04Shipped real-time collab rooms over Supabase channels so a teacher can shadow a student's screen and intervene without leaving their desk.

• →Used weekly by my own Grade 2–6 classes for two years of iteration.
• →Cleared a Swiss-style data-protection review (nFADP) with documented sub-processors and data minimization.
• →Stripe-powered school + family plans live, with token economy as the engagement loop.