#prd

v2 PRD, Part 3 — identity, payment, PII, compliance

“The PRD's job in the compliance section is to draw a small box around payment data and a smaller box around customer identity, and then design every other system component to stay outside both boxes.”

v2 PRD, Part 2 — applications, data model, cloud

“An entity model is a contract with your future self. Get it wrong and every feature spends the next five years paying interest on the mistake.”

v2 PRD, Part 1 — hardware specs for a battery device

“The PRD answers one question at every layer: 'what does this device need to do that a smartphone with the same app couldn't do?' Every part of the spec earns its place against that question.”