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mobile/push-notifications-how-your-phone-buzzes-for-an-app-that-isn-t-running.md Push notifications: how your phone buzzes for an app that isn't running Your phone buzzes with a message from an app that isn't even running. How? Phones keep one shared connection to a push service (Apple's… 4 min read · 22 Oct mobile/offline-sync-what-happens-when-two-phones-edit-the-same-contact.md Offline sync: what happens when two phones edit the same contact You edit a contact's phone number on a plane. Your partner fixes the city on a tablet. Both devices are offline, then both reconnect. Which… 5 min read · 19 Oct infrastructure/rolling-deploys-how-a-website-updates-without-going-offline.md Rolling deploys: how a website updates without going offline How does a busy website switch to a new version without going offline? Not by replacing everything at once. A rolling deploy updates one… 5 min read · 15 Oct mobile/how-does-a-push-notification-find-your-phone-when-the-app-is-closed.md How does a push notification find your phone when the app is closed? A push notification does not come from your app. Your phone keeps one connection to a service run by Apple or Google, and your app's server… 5 min read · 6 Oct mobile/two-phones-one-note-what-happens-when-edits-collide-offline.md Two phones, one note: what happens when edits collide offline? Phones lose signal all the time, so good apps keep a local copy of your data and sync with a server later. But what happens when two… 5 min read · 3 Oct mobile/native-web-or-cross-platform-how-apps-get-from-your-code-to-a-phone.md Native, web or cross-platform? How apps get from your code to a phone Every app idea hits the same fork in the road. Build it native in Swift for iPhone and Kotlin for Android, build it for the web with HTML… 9 min read · 1 Oct