Lists

Practice set in the business of a giant online store: delivery promises, stock holds, warehouses, carriers and flash sales. Inspired by the problems Amazon-scale retail runs into; the scenarios are illustrative, not Amazon's internals.

Practice set in the business of a payments platform: splitting money to the cent, idempotent charges, reconciliation, card forms, webhooks and ledgers. Inspired by the problems Stripe-scale payments run into; the scenarios are illustrative, not Stripe's internals.

Practice set in the business of an AI lab's model platform: context windows, rate limits, prompt caching, evals, streaming and inference routing. Inspired by the problems Anthropic- and OpenAI-scale APIs run into; the scenarios are illustrative, not either company's internals.

Practice set in the business of a global maps product: EV routes, nearby places, rush-hour traffic, search as you type and live ETAs. Inspired by the problems Google Maps-scale navigation runs into; the scenarios are illustrative, not Google's internals.