Before You Let an Agent Own Your Tests — Deciding How Fixtures and Seed Data Live
Agents will happily edit test data until the tests pass. A practical defense built on fixture ownership, deterministic seeds, and anonymized subsets of production data, with working scripts.
When Every Antigravity-Written Test Is Green but the Same Bug Comes Back — Field Notes on Measuring Hollow Assertions
Your AI-written tests all pass, coverage is high, yet the same defect returns to production. The cause is over-mocking and tautological assertions. These are field notes on using mutation testing as ground truth to measure what your tests actually protect, and to fix it operationally.
Adding Mediation Partners Quietly Starved My iOS Attribution — Reconciling SKAdNetwork IDs Across Four Apps
I added mediation partners but iOS revenue barely moved — the cause was missing SKAdNetwork IDs in Info.plist. Here is how I reconciled SKAdNetworkItems across four apps, using an Antigravity agent as the matcher while keeping the revenue decisions by hand.
Hand Over Generation and Shipping, but Never the Signing Key — Designing Key Custody and Handover for an AI-Driven Pipeline
Even in an era where AI Studio and Antigravity take over everything from generation to internal-test shipping, the app signing key is in a class of its own. Lose it, and that app can never be updated again. As a solo developer who has run several apps for years, here is how I design key custody — separating the upload key from the app signing key, storing it, and planning the handover for the worst case.
Green in the Embedded Emulator, Broken on the First Real Device — Putting a Parity Gate on AI-Generated Compose Apps
AI Studio now generates Kotlin/Compose apps from a prompt, runs them in an embedded emulator, and pushes them to a real device over USB — all from one screen. Yet a screen that passed in the emulator can break the first time it lands on a real phone. As a solo developer running several apps, here is how I put a gate that catches device parity issues before they ship.
An Agent Granted 'Watch an Ad to Unlock a Wallpaper' Entirely Client-Side — Re-Verifying Reward Grants with AdMob SSV
I asked an Antigravity agent to wire up 'watch a rewarded ad to unlock a wallpaper,' and it returned an implementation that wrote the unlock flag client-side only. Here is why that is not enough, how I re-verified the reward grant with AdMob server-side verification (SSV), and how I stopped double grants too.
When Xcode Cloud's Free 25 Hours Quietly Run Out at Month's End — Field Notes on Measuring and Defending Compute Time
Before Xcode Cloud's free compute allowance drains at month's end and your builds sit queued, measure where it goes. Practical field notes on pulling usage from the App Store Connect API, stopping wasteful builds early, and trimming test runs to keep CI inside budget.
The Day Generation, Device, and Internal-Test Shipping Became One Step — What I Refused to Hand Over
AI Studio now turns a text prompt into a Kotlin/Compose app and carries it through the emulator, a real device, and Google Play's internal test track from one screen. Behind that convenience sits a question: how much of the moment of shipping do you hand to the machine, and what do you keep in your own hands? Here is where I draw the line as a solo developer running several apps, and the implementation that holds that boundary.
Running Pre-Release Checks Without Opening the IDE — Designing the Android CLI as the Verification Gate of an Unattended Pipeline
How to slot Android CLI v1.0 into an unattended pipeline as its verification gate — three layers of checks, an exit-code contract, and a density-by-locale matrix, sized for an indie developer's day-to-day.
When StoreKit 2 Users Say They Paid but Can't Access — Field Notes on Subscription Entitlement Drift
StoreKit 2 subscriptions are harder to operate than to implement. This is a record of the drift between currentEntitlements, subscription.status, and server notifications — and the reconcile logic that finally stopped the support tickets.
Letting Users Switch the App's Language Without Touching Their Device Language — Notes on Android Per-App Language
How to implement in-app language switching on Android with AppCompatDelegate.setApplicationLocales and locales_config, plus the gotchas around pre-API-33 compatibility, activity recreation, and AdMob, from an implementation point of view.
The Back Button Showed an Interstitial Sometimes, Not Others — Rewriting Nested ifs Into a List of Independent Guards
Interstitial display on back press was unstable because nested if statements hid the priority between conditions. Here is how I split it into reason-returning guards and generated tests from a decision table.