MJ Stories

Mobile craftsmanship stories

Cover Image for You Cannot Fix a Generated File

A generated file is an input, not a place to put decisions. Whatever you write there has a lifetime bounded by the next regeneration, and that regeneration arrives inside somebody else's unrelated pull request. Hold the exception in code the generator cannot reach, and point the guard at the upstream source of truth rather than the artifact.

Android
androidkmpoffline-firstpowersyncsync

Series · 7 parts

Offline-First KMP

When your mobile app must work without internet as a standard, not an edge case, the sync layer is just the first decision. What comes after — preserving user intent offline, trusting a "success" your server never actually confirmed, resolving conflicts as a human decision — is where offline-first actually gets hard. Field notes from a production KMP winery app.

  1. 1Choosing an offline-first sync layer for KMP
  2. 2Two writes for every tap
  3. 3Minting IDs Before the Server
  4. 4The Write You Never Clean Up
  5. 5HTTP 200 Is Not Success
  6. 6Your Schema Is Not Your Payload
  7. 7You Cannot Fix a Generated File

More Stories

Cover Image for Your API key is not a secret

Your API key is not a secret

We have been hiding API keys in Android apps for a decade — with BuildConfig tricks, NDK, obfuscation libraries. None of it works. The fix is not better hiding; it is treating the key as a public identifier and proving the app is genuine instead.

Android
androidsecurityplay-integritybffarchitecture
Cover Image for Share iOs string resources with Android

Share iOs string resources with Android

There might be a requirement for mobile string resources to be defined or adjusted by management or copywriters. There also might be a requirement to add localization later by those roles. And on top of that strings should be synced across platforms.

Android
androidresourcessharedpoeditor