I am personally not hiring.
But the hiring landscape is very different. I had a conversation about this with another manager who is hiring at work. Very anecdotal info below:
We may see much higher applications. Most are going to be backed with good brands. It's hard to let go of the bias that we maybe looking at the bottom quartile for these companies. Most will be extremely good at the interviewing. The candidates will also have very different motivations.
The bottom quartile at some of these companies could still easily be in the top decile at many other companies. Unfortunately every company thinks they need, and are deserving of "Top Talent".
I think people at big companies often overestimate their own ability and often underestimate people who work at smaller companies.
I think working at a bigger company is a somewhat different skillset involving a lot more navigating bureaucracy, meeting certification standards, documenting and presenting, etc.
Smaller companies focus a lot more on "get stuff done, figure out the details later"
I think a lot of big corp employees look down at startups because it’s a huge gamble. They get paid less and have unstable careers. And so they confuse it for ability. Personally, I think those that work at startups learn to be more adaptive and gain more valuable skills outside of bureaucracy.
As a textbook, I suggest Investment Science by Leunberger. It's concise and has great coverage, and you can just keep referencing it over time.
As an initial focus, I suggest understanding discrete time models well. If you've got some LA and calculus then I'd suggest just hoping into Introduction to Mathematical Finance by Pliska. It's concise, zero filler, but really clear.