Senior mobile engineer with 7+ years building Flutter applications for global consumer products across e-commerce, fintech, mobility and food delivery.https://kelvengalvao.comenhttps://kelvengalvao.com/blog/an-agent-that-returns-a-tested-prhttps://kelvengalvao.com/blog/an-agent-that-returns-a-tested-prDesigning an agent graph where the scheduler is deterministic Dart, the models reason inside nodes, and nothing ships until a validator has driven the app and produced evidence.Mon, 21 Sep 2026 00:00:00 GMTai-agentsarchitecturetestingdarthttps://kelvengalvao.com/blog/face-recognition-that-never-leaves-the-devicehttps://kelvengalvao.com/blog/face-recognition-that-never-leaves-the-deviceBuilding photo check-in for a martial arts app: why the model runs in the browser, why the biometric template is never stored on a server, and why two brothers in the same gi drove the hardest design decision.Sun, 20 Sep 2026 00:00:00 GMTface-recognitionprivacytypescripthttps://kelvengalvao.com/blog/four-caches-between-a-photo-and-the-screenhttps://kelvengalvao.com/blog/four-caches-between-a-photo-and-the-screenHow a commerce app keeps image memory bounded: resize at the CDN, cap the decode, size the caches in pages rather than megabytes, and keep a remote kill switch.Sat, 19 Sep 2026 00:00:00 GMTflutterperformancememoryhttps://kelvengalvao.com/blog/flutter-ci-21-minutes-to-7https://kelvengalvao.com/blog/flutter-ci-21-minutes-to-7A test suite that booted 304 engines, caches that were invisible to the runs that needed them, and a staging pipeline compiling the same Dart twice.Fri, 18 Sep 2026 00:00:00 GMTflutterciperformance