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Shipped an AI voice tutor

0→1 product

  1. Expertise at Scale

    A voice tutor with a playbook for each category modeled after the strategies that private tutors use.

  2. Cross Session Memory

    Built a memory layer that surfaces patterns in a student's responses across sessions, flagging recurring mistakes before they repeat.

  3. Concurrency-Safe Billing

    Rewrote the live-call write path for correctness under concurrency, collapsing three round trips into one atomic Postgres function.

  4. Auditable by Default

    Shipped beta version in 4 days with evals and a metrics pipeline tracking end reasons, transcripts, tokens, etc to iterate on real signal.