Mobile Developer Cover Letter Example

I own the React Native app behind Ashgrove Mobile Studio's consumer product, which has about 1.2 million downloads and a 4.7 rating that I take a little personally every time it dips. I'm applying to your Mobile Developer opening because the posting talks about performance and crash rate as product features, which is exactly how I've had to think about this app for the last three years.

Splitting our JavaScript bundle and lazily loading screens people rarely open on first launch cut cold-start time from 3.8 seconds to 1.4, and rewriting a flaky background-sync module took our crash-free rate from 97.2% to 99.5%. A biometric login feature I shipped was adopted by 68% of active users within two months, which told us the friction we removed was real.

I build primarily in React Native with native Swift and Kotlin modules where performance demands it, wire up Firebase for analytics and push, and use Fastlane to keep our release process boring in the best way. I watch Crashlytics daily, not weekly, because a new crash cluster is cheaper to fix within a day of a release than a month after it. I also file a short postmortem for any crash cluster that reaches more than 1% of sessions, since a fix without a written cause tends to quietly come back.

I'd welcome the chance to talk through the sync-module rewrite and hear what performance or stability problems [Company name] most needs solved next. Thank you for your consideration.