IoT Health Tracker for Children
Lifee was my own company, and the product was a game the child happened to wear. Most activity bands measure; this one fed a creature that levelled up when a child ran around, and let them challenge their friends with it. I designed the circuit, wrote the firmware, built the apps, set up the production line and took it through CE certification.
The bracelet earns points for movement and spends them in the app, on a creature that gains levels and currencies. That was a deliberate position against a market full of bands that report numbers at you: make it fun and let the exercise be the by-product. In 2016 the regional SKAPA Framtidens Innovatör prize went to the four of us at Lifee, and the jury's citation named the gamification specifically.
A custom PCB carrying BLE, battery management and an accelerometer, designed alongside the enclosure it had to fit inside. The first prototypes were assembled by hand and run through an IR reflow oven at Linköping University, the cheapest way to find out whether a board you drew actually works.
Embedded firmware on FreeRTOS with a BLE stack, and over-the-air updates working across both mobile platforms. On a wearable sold to schools, a bug you cannot fix remotely is a bug you fix by post. The apps are React Native for iOS and Android, with a custom native BLE module written to talk to the bracelet.
I built a Linux-based test suite for production and an Electron flash-and-test tool simple enough that both the internal team and the external assembly house could run it without an engineer present. Then I set up the line itself and managed assembly, testing and shipping of 1000+ units.
The BLE design was chip-down rather than a pre-certified module, so there was nothing to inherit and the product needed a full radio sweep for EMC and radio compliance. I led that, and the App Store and Google Play releases with it. The bracelets went into schools, which is where a wearable for children has to survive contact with actual children.
Founder & Technical Lead
Hardware Design / Embedded C / FreeRTOS / BLE / React Native / OTA Updates / Linux / IoT
BLE and storage redesignSystem Developer & Hardware Engineer
Wearable ECG Monitor Hardware Redesign
Hardware Design / PCB Design / Embedded C / BLE +2
50+ stations deliveredPrincipal Engineer
Real-time scoring system for GYMRACE fitness competitions
Raspberry Pi / Node.js / TypeScript / React +5
Zero idle compute costPrincipal Engineer
Automated CI/CD Platform for Unity Game Studio
GitHub Actions / AWS / EC2 / S3 +6
Next step
Send me a short description of the problem and I'll tell you whether I'm the right fit, what it would cost, and how long it would take. No pitch deck.
