Interviewed at Arauco and wanted to share my experience for anyone going through the process. The screening call was pleasant and a bit more detailed than your typical first-round — they asked specific questions rather than the usual high-level overview, which I actually appreciated. It set a good tone. The manager round was equally comfortable. He was calm and approachable, mostly trying to gauge whether I could do the work. Some behavioral questions, nothing unexpected. Then came the final panel round, and this is where I'd want to give future candidates a heads-up. The panel walked in with papers in hand, looking a little disengaged from the very start — it set a strange energy in the room right away. But the bigger surprise was the format itself: after two rounds with zero technical questions, I walked into the final round fully prepared to get into the technical weeds. Instead, it was back-to-back behavioral questions the entire time. "Tell me about a time..." all the way through. I wasn't mentally set up for that, and it showed. I fumbled through answers I could have nailed with the right preparation. So the advice is simple: do not assume the final round will be technical just because the earlier rounds weren't. For a data role, it's easy to over-index on technical prep and under-prepare your STAR stories. Have your behavioral answers as ready as your ML concepts. Overall a smooth enough process — just go in ready for anything.