If you are making a senior engineer salary at a US company but living abroad, you will be taxed quite heavily since you'll need to pay taxes in your country of residence, plus be taxed on income at the higher brackets over $100k in the US.
Most countries have double taxation treaties.
1. If the tax rate is lower in your host country, you pay tax on income greater than 100K minus whatever tax you paid in your host country. Let's call the US tax rate 35 and the host country 30%, and your income 110: You pay 5% to the US, e.g. 500 USD (plus, probably a similar amount to a tax advisor)
2. If the tax rate is higher in your host country, you deduct your host countries taxes from your US tax and only pay the tax advisor.