Where I’ve been building

Garmin binding + MAUI app

7 live vital types

A .NET 10 Android binding of Garmin’s native Health SDK and a MAUI companion app that pairs wearables and streams 7 vital-sign types (heart rate, HRV, SpO₂, ...) to the VitalsIQ backend.

Java → C# binding transforms

Hand-authored transforms that pull the Java SDK cleanly into .NET, resolving R8, Guava, SQLCipher and Gson interop conflicts, plus an Android foreground service for resilient background sync.

CivTAK plugin

A Java plugin for CivTAK (civilian ATAK) that surfaces the VitalsIQ app as an in-app pane and a live map marker.

JABCode C → C# port

The full JABCode colour 2D-barcode library - encoder and decoder with Reed-Solomon error correction - ported from C to C#.

On-device noise classifier

92% @ 40 KB

End-to-end pipeline (data preparation, training, evaluation and firmware integration) for on-device inference on the nRF54L15.

Zephyr firmware architecture

~3K LOC

AuraSense firmware in C/C++ on Zephyr RTOS and the nRF Connect SDK, architected as 11 self-contained driver components.

Acoustic metering pipeline

Real-time A-weighted (3-stage biquad IIR) dBA and Leq over 10 s windows from stereo 16 kHz PDM MEMS microphones, with calibrated dB-SPL and clipping detection.

Power profiling & fix

960 → 189 µA

PPK2 differential profiling to root-cause the LTE-modem floor, an LDO-vs-DC/DC path, and a mis-wired PMIC GPIO.

LTE-M / NB-IoT uplink

An nRF9151 serial-modem client (AT sockets, hand-written JSON codec) talking to a Node.js / Express telemetry backend.

Factory test framework (Insyght Testsuite)

An automated end-of-line framework: a PySide6 head-unit GUI orchestrating multiple Raspberry Pi module units over MQTT, driving firmware flashing, hardware monitoring (voltage, current, temperature), AT-command network checks and HackRF-based RF signal generation.