Totally food for thought, but here are my 2.7349 cents: The hiring process doesn't seem to, and of course this is totally an completely assumptive-- based only

Totally food for thought, but here are my 2.7349 cents: The hiring process doesn't seem to, and of course this is totally an completely assumptive-- based only on the list of items in your post, reflect any reason why a senior engineer would want to apply there. Most people want one of two things: more money or more growth. Right now, I'd guess, that potential candidates aren't feeling either from the ad. Is the salary actually good? Reading the job details I can say I'd expect at least ~$200k/yr cash, some sort of yearly cash bonus, and equity in the company. Additionally, there may be language in the job ad; which, turns off more experienced candidates, e.g. "ninja," "rockstar," "10x". Very subtle changes to the language you use can completely change your applicant pool for both good and bad, it's worth experimenting via services that help with this (by reviewing the job ad) or consultants (though I'd try a service first, gonna be a lot cheaper). Finally, seeing your stack being ops related, I'd guess a lot of qualified people are assuming you don't pay enough or will have awful work life balance. Are folks on-call 24/7? Salary might be alright unless your on-call 20% of your life-- in which case maybe it ain't. Speaking to that in the ad might really help pique some folks interests (if the work-life balance is good). Good luck!