• Mobile-first quiz flow: Scoring and transitions run locally so each tap feels immediate. There’s no “waiting for the server” between questions; the UI responds the second you pick an answer. • Frontend & Memory (FlutterFlow): Custom Dart actions power the entire journey—from a local OTP verify before we touch the backend, to generating your final PDF certificate right on your device. No third-party print APIs, no extra steps. • Backend & Data Integrity (Supabase): Three core tables (questions, user ratings, student leads) keep data tidy. A strict lockout protocol flips an is_assessment_completed flag the moment you finish the quiz; if the same email tries to re-enter, we intercept at OTP and show a locked state—no cookie-clearing workarounds will bypass it. • Custom Actions & Logic Pipeline: OTP is generated and verified on-device. Once the last question is scored, a single Dart action packages your result and renders a branded PDF locally, then offers it for download—all without a server round-trip for the file itself.