A wellness app that keeps your voice on your phone. It combines voice emotion, heart rate, activity and optional text into one Vitality Score, and raw voice and text never leave the device. I trained the speech-emotion model, compressed it with TensorFlow Lite, and rewrote the Mel-spectrogram preprocessing in Dart so the whole pipeline runs offline.
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An app that replaced a paper-based process for a rental company. Managers add, update and remove carts, handle customer reservations, filter by type, status, color and price, and keep track of insurance and compliance dates. I deployed the backend and released the Android app.
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A web and mobile system that replaced crowding at the registration office with an ordered digital queue. Security staff register students and issue numbers, counter staff advance the queue, and a live display shows the current number at each counter. It ran in daily use for about a year, for 100+ students a day and around 4 staff.
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An app to run a gas station and its rewards program, with admin, operator and customer roles. Operators register each fuel transaction by scanning a customer's NFC card, pick the pump, enter the odometer and fuel quantity, and print a receipt. Customers track transactions and redeem rewards.
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