Programming languages:
Python, Php, Golang, bash
Api implementations:
For example youtube, openai, trading apis.
Bots:
for messengers like whatsapp, telegram but also custom bots
Artificial Intelligence:
OpenAI, Speech systems eg TTS, image coloring...
Web scraping / data extraction in general:
Custom or implementing chromedriver
GIS / Mapping Software:
GIS / OpenStreetMap, google maps
Custom Maps, tool handling: osmium/osmosis/Api, pbf handling
wordpress:
Fixing broken installations when no-one else can, writing small plugins