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Phone-based location sharing fails exactly when it matters most: dead batteries, no signal, a phone left behind. Families who need real safety coverage need a system that doesn't depend on a phone being in someone's pocket.

GuardAngel pairs a Flutter app with a dedicated GPS tracker watch, so location, SOS, and safe-zone alerts keep working independent of any phone. The app becomes the family's shared control center.

The GPS tracker hardware spoke a proprietary TCP protocol with no public SDK or documentation — there was no vendor library to lean on.

Wrote a full protocol parser from scratch and bridged it into Firestore through a custom Node.js TCP server — 13 files covering the parser, bridge, HTTP command API, and SMS-based provisioning.

Scam messages, phishing links, and fraudulent listings move faster than most people can fact-check them. Existing scam-report tools are reactive — they log a problem after the damage is done.

LensAngel AI puts a scam-detection layer directly on-device: point the camera or paste a screenshot, and a hybrid AI engine reads the content, scores the risk, and explains why.

Apple rejected the build twice before approval — review teams scrutinize anything claiming to detect fraud.

Built the hybrid on-device + cloud pipeline so the common case stays instant and offline-capable. Implemented full content moderation to satisfy Apple's UGC requirements.

A nonprofit needs one system for donations, volunteers, and events — not a patchwork of spreadsheets and group chats.

A single Flutter app connects donors, volunteers, and staff: donations, a digital volunteer ID, event coordination, and food distribution tracking.

A persistent crash — TextEditingController getting disposed mid-edit on the admin screen — plus a chat sender bug from stale auth state.

Isolated the field into its own _IsolatedTextField StatefulWidget so it stops getting torn down mid-edit, and fixed the chat bug by reading FirebaseAuth.instance.currentUser directly.