The Grand Ayatollah Khamenei answered a question about working for non-Muslims.
Question: What is the ruling regarding working for Jews, Christians and other disbelieving sects and being paid by them?
The Grand Ayatollah Khamenei: On its own, there is no problem working for disbeliever, on condition that the job is not Haram, and is not against interests of Islam and Muslims.
source : shafaqna