Hard: STM32, ESP32, RaspberryPI, etc...
Code: JavaScript, C/C++ , Python, etc...
UI: Angular/Vue, CSS, Sockets, etc...
30+ years IT experience.
Web sites, Billings & databases, develope IOT devices, LoraWan networks, and many other things. Just ask me.
Preferred JS, C, HTML, CSS, Sockets. But I can resolve you task by your lovely methods.