Weekly design challenge

One scenario a week, scored the same way for everyone: build a design, run it against the load and the faults, and see where you land.

This weekOpen2026-W44

Helpdesk API: every tenant, one gateway

A multi-tenant helpdesk API sits behind one gateway. Serve every tenant fairly at peak and ride out a slow API, a lost instance and an identity-provider outage without overspending.

Open the challenge0 entrants so far

2 November 2026 at 12:00 am IST

Earlier weeks

Electricity bills: the due-date rushThe last days before the bill due date send payments and balance lookups through one Postgres. Stay fast and keep paying through a slow billing service and a lost instance, inside the budget.Closed0 entrants2026-W43Closed0 entrants · 2026-W43
Festival bus search: hold the surgeDussehra travel week: route searches triple while seats are held and released. Keep search fast through a slow service, a lost instance and a cache failover, inside a monthly budget.Closed0 entrants2026-W42Closed0 entrants · 2026-W42