You've got recognisable names like Microsoft, Amazon, Stripe etc, but also a large amount of tech jobs in staid banks and insurance companies, as well as a fairly healthy amount of startups and other small and medium sized enterprises.
Pay is good. Assuming your housing situation is ok, you can have a decent career and a stereotypical comfortable middle class existence - mortgage, car, a foreign holiday every year (with 20-something days of annual leave per year) and the possibility of putting your kids through college without either loans or maintenance grants.
Beyond pay, and not getting too far into social safety nets and GINI coefficients etc, it appears to be common to get fired with no notice in the USA. That level of insecurity is rare in Ireland, and pretty much unheard of in any office job.
I’m eligible to work anywhere in the EU but the pay in continental Europe seems much worse than what I could earn working remotely for a US company.