Obviously a question for a expat tax expert. Just remember that US citizens and resident aliens must file tax forms. There is an exclusion available for Foreign EARNED income. It is about $75,000. You need to be either:

A) a bona fide resident. (drivers lisc, phone and utility bills, etc) OR
B) physically present in that country for something like 300 of 365 days.

If you qualify, you must file or loose the credit. By the way the Social Security department still wants their 15% but have no real way to collect or even know what you earned.

These tax rules are very tricky and change yearly. You really need a good professional. Or you could wing it and just not admit making any money as there will probably not be a W2.

Good luck