Neuroscience BS trying to map out actual industry paths

I’m an undergrad neuroscience major working in an analytical chemistry / diagnostics lab focused on biomarker development. My work touches biosensing, biomarker assay development, instrumentation, and some ML/computational modeling of biological signals. I am interested in working in all/any one of these areas.

Through academia, I’ve realized this space is much broader than any single industry role, and I’m trying to understand how it actually maps onto real jobs. Industry titles are very opaque from the outside (Associate Scientist, Research Analyst, Scientist I, Research Associate, etc.), and my mentors are primarily academic researchers who don’t have much visibility into biotech structure.

I’m trying to understand from people working in industry:

1. What was your first industry job after undergrad (or MS/PhD)?
2. What do you actually work on day-to-day?
3. How did your role evolve into your current position?
4. Do you recommend entering industry after undergrad and potentially pursuing graduate school later, or getting an MS or PhD first? Do you even need grad school?

I’m specifically looking at companies like Eli Lilly and similar biotech/diagnostics firms, but I don’t yet have a clear understanding of how they hire across levels or how career progression differs between BS-entry vs PhD-entry paths.

I’m mainly trying to understand how this space actually maps in industry so I can make informed decisions about my next steps. I'm looking more for lived experience from people in these roles.