A Friday-night promo can't delay 'your driver is arriving': three lanes and the inbox

transcript

Friday night. Marketing sends a promotion to every customer. Meanwhile, your driver is arriving. Where's that message? Stuck in the same queue, behind the promotion.

The fix: three lanes, not one queue. Critical: sign-in OTPs, and driver offers. Never shed. Transactional: confirmed, assigned, arriving, delivered. Bulk: promotions. Paced, never ahead of an order update. Each lane gets its own topic, workers and provider quota.

Driver arriving is transactional. First, write it to the inbox. Then send a hint down any live connection. Push only if no device acknowledges in a few seconds.

Tracking screen open? It's acknowledged live. No push at all. App closed? Pushed at once. It replaces driver assigned. But here's the catch. Phone in a lift, socket dead. No acknowledgement, so it's pushed. Reconnect shows it once.

Give urgent messages their own lane, all the way out. Write it down first. Push only if nobody heard.

Full breakdown in the lecture.