Every product breaks differently. ReadyForUsers knows how yours will.

Trials that expire mid-session, seat limits reached by two admins at once, downgrades that must prorate correctly.

Two buyers reaching one listing, sellers editing stock mid-checkout, payouts that must reference a settled transaction.

Block and mute rules that must hold server-side, feeds that leak content from blocked accounts, report queues under load.

Verification that actually verifies, unmatch that revokes access to photos, hostile actors probing for location data.

Idempotency on every write that moves money, retries after timeouts, balances that must never go negative twice.

Agents that loop, tool calls that fail silently, prompt paths that spend a month’s budget in one session.

Held seats that expire mid-payment, price changes between search and book, cancellations inside a penalty window.

Promo codes that must be single-use, carts that survive a session refresh, stock reserved but never released.

Two people taking the last slot, timezone arithmetic across DST, reschedules that orphan the original.

Offline transitions with pending writes, permission denial paths, low-end devices where taps arrive late.