Starting my first Process Development Engineer role at a semiconductor startup — how do I stand out and not mess this up?

I’m starting a new Process Development Engineer position at a semiconductor startup on the 12th, and I’m looking for advice from people who’ve been in similar roles. This will be my first full-time engineering job. The company is a startup working on very cutting-edge semiconductor technology, and it honestly feels like an amazing opportunity that I really don’t want to waste. I do have some experience from internships, mostly working on MEMS devices with critical dimensions around ~5 µm. This startup, however, is operating at the nm scale, so I’m aware the level of rigor, physics, and process control will be very different. I’m motivated, willing to put in the work, and eager to learn, but I also know startups move fast and expectations can be high. I want to make sure I: • Ramp up quickly • Add value early • Build strong fundamentals instead of just “following recipes” • Avoid common mistakes new engineers make in startups Questions I’d really appreciate advice on: • What should I be doing before day one to prepare? • What habits separate strong process engineers from average ones early on? • How can I best learn when documentation may be limited? • What should I focus on in my first 30–60–90 days? • Any mindset shifts coming from internships → full-time startup engineer? I’m excited but also a bit nervous, and I want to do everything I can to excel and contribute meaningfully. Thanks in advance! I really appreciate any insight.