You've asked a very broad question, and many of the possible answers are easy to find with trivial effort on your part.

There's the usual employment questions (insurance coverage, holidays, flex time, bonuses, options, etc). How much training do they do? Does that include career advancement, management courses, and job rights/EEOC training? How many conferences will they fund you to attend?

There's the usual Joel-test sort of questions (source control, one-step builds, daily builds, etc?).

Frankly, I would think someone in a "senior" position would be able to ask a better question than this. That shows in your three years history on HN; it seems you really like asking broad undirected questions that no one answers. Improving that skill is much harder than improving a tech skill, but perhaps a course in technical writing would be useful here, since it would involve improving your understanding of what others think are useful. Perhaps that or a related sort of training is possible as part of your employment?