Notes

Notes on building software.

Short, specific writing on how we build — not marketing copy.

• 27 Sept 2026

  Keeping one business's data away from another's in a multi-tenant app

  Salons and clinics trust a shared platform with their customers' details. Here is how we make it hard for one business to see another's data, and where the risks remain.

• 27 Sept 2026

  How we stop two people booking the same slot

  A booking system has one job that cannot fail: never give the same appointment to two customers. Here is the three-layer approach we use in Rivo, and its trade-offs.

• 28 Jul 2026

  Why we default to offline-first, even when the client doesn't ask

  Indian mobile networks are good on average and terrible at the margins. Averages are not what your users experience.