With the information you provided it's very difficult to compare both options, specially if you would have to move to a different country with most likely a muc

With the information you provided it's very difficult to compare both options, specially if you would have to move to a different country with most likely a much more expensive cost of living. Would the company pay for the moving costs? Salary could be 85% higher and taxes + cost of living could amount to 150% more so you would be worse off, also it seems they would not be providing any standard benefits like health insurance and others, so I suggest you try to figure out your costs including rent, health insurance, electricity and gas, broadband and day to day expenses and then compare to your current situation. It seems you live with your parents so you don't have to pay rent and food etc, so even if you wanted to move out of your parents house in your country z costs would most likely be much lower than in the country of the opportunity you are considering, so calculate those costs as well. Also you say on your current position they offered you to become a manager. Don't think of that as a promotion, but a lateral move, it's a completely different job with a completely different set of skills. You could be a good developer and a terrible manager, and also you might enjoy coding and maybe you would hate day to day work as a manager which mostly involves meetings with your reports and with your bosses and stakeholders and other people, Jira, Excel, mails... Again, this is personal, maybe you would thrive in a managerial role, but don't think it's a promotion, as it could as well be for the worse.