I'd be very tempted to ask the HR person for their salary and/or ask for the CTO/CEO's salary and/or some confidential revenue number or something like that bef

I'd be very tempted to ask the HR person for their salary and/or ask for the CTO/CEO's salary and/or some confidential revenue number or something like that before ending the interview. It's fairly shady negotiating to anchor the process one sided. If they want your salary they should tell you what the highest paid developer makes as well.