PTT Dispatch Console
A commercial push-to-talk dispatch console, rebuilt from a proof of concept into software an operator runs all shift.
Charlez Kwan
I turn operational problems into working products.
Independent product engineer. I help businesses clarify a problem, test the concept, and turn it into a working solution — handling both the software and the device side.
Selected case studies
All case studies → 
Daideeonline
Big2 (Daidee) in the browser with live voice chat — share a link and friends are in. No app, no account.
Insolvency Invoice Assistant
AI-assisted invoice triage built with and for insolvency administrators (Sachwalter).
EventCore
A system that records real-world events — QR scans, NFC taps, sensor readings, GPS positions or manual input — and turns them into live views and reports.
How I work
I help companies investigate operational problems and test possible solutions before they spend heavily on development. Most engagements move through three stages, and each stands on its own — you can stop after any of them.
1 · Product discovery
We look at the workflow, the users, the constraints and the tools already in place, and work out what should actually be built — and what should not. You get a workflow map, a technical concept, a prototype plan, the main risks and an estimate of the implementation stages.
2 · Working prototype
The smallest version that demonstrates the real value, even if parts stay manual or simplified behind the scenes. It exists to answer one question: will anyone use or pay for this?
3 · Product implementation
Once the concept has proven itself, I build the system for real — software, devices, dashboards, deployment and integrations — reliable enough for daily operation.