You work for an Irish company who presumably pay you a salary into some bank account. First, you need to check the situation from that angle, not just for tax but employment rights etc.
Assuming tax is your only consideration, you could actually have no residence anywhere for tax purposes, simply by making sure that you do not automatically qualify in any country - they all have their own quirky rules. Some (including Ireland) allow you to voluntarily apply for tax-residence even if you don't qualify. Also, you need to avoid multiple tax residency.
To minimise tax I would look at places look the Isle of Man. As long as you have an address there, these off-shore states are not to concerned about your qualification as long as you pay their minimal taxes. Often they do not tax you on income you earn outside their state. I guess you have an Irish domicile, so you might do best with an address in say Isle of Man, savings in Jersey, and working in Europe. Switzerland might be worth a check, or Monaco