You launched a feature and user behavior changed, how do you define success metrics?

"I got reached out to on LinkedIn and went through the full loop for a Senior Data Scientist role in San Francisco, targeting around L5. The process was recruiter screen, a 48-hour take-home data challenge, a one-hour technical review of that challenge plus AI-code debugging, a hiring manager screen on one of my past projects, and then a four-interview final panel. Overall it felt more like a strong big tech data science process than some completely different AI-company thing, except they clearly assumed I was comfortable using AI tools and reading machine-generated code. Everyone asked some version of why OpenAI, so there was a slight missionary vibe, but safety and ethics mostly showed up later with PM and leadership. I made it all the way through and did not get the offer."