I like following a system to the point where one of its assumptions stops holding.
I started with low-level programming. Back then, a bug could come down to a register, a timing issue or a single bit.
In GPS:NO, my work spans C++ firmware, UWB positioning, testing and evaluation. BO-Tracker was a team project where the boundary moved further out: microcontroller, cellular link, cloud processing and a web application. My contribution was in firmware and AWS IoT/Lambda integration.
Backends, interfaces and infrastructure then became further parts of the same system. I do not only want to know that something works. I want to understandwhy — and what happens when one layer fails.
I prefer understandable architectures, measurable results and documentation that explains why a system was built the way it was.
And I like the point where a project stops being a prototype and starts becoming a real system.