What programming skills are actually required to become a strong SDET?

I see job descriptions asking for Python OR Java OR JavaScript AND sometimes all three. I'm trying to figure out what I actually need to know well. My current read: - **One language deeply** — can write clean, debuggable code, not just copy-paste - **Basic data structures** — dicts, lists, sets, when to use which - **Async/concurrent patterns** — because test frameworks use them and bugs hide there - **Git** — obviously - **SQL** — for database validation Is that roughly right? What would a senior SDET look for if they were hiring someone more junior? What gaps do you most often see in junior SDET candidates?