Yes. Java, Python.
Thanks. Do you think there is a strong market of Android/iOS native app development? As a DE I don't think my previous experience worths much -- maybe a bit more when we move to Flink which uses Java, and the might would rather hire new graduates instead of me.
Interesting if you just like data, but bad if you like the tech beneath. I'd recommend moving away from DWH part of data engineering if you can, and focus on OLTP, streaming which are more technical. The culture is also different.