I worked in many different fields from high resolution graphics processing using C++ over backend infrastructure implementations for large web-providers to writing medical software for a portable MRI machine. I mostly spent my time writing backend or embedded software, which is where I have the most expertise. I know the basics of front-end web development too, but I would not consider myself an expert in that field.
Medical Device software for a portable MRI machine
IoT infrastructure design, RFID hardware communication, Data-analytics for retail