Okay, let’s tackle this. So Gonçalo Costa has full professional proficiency in English, which is a highly valued skill in the job market. Native proficiency in Portuguese is also a plus, especially in a location like Watertown, Massachusetts, which has a significant Portuguese-American population. Elementary proficiency in French and limited working proficiency in Spanish are also useful skills. Considering his language skills, especially English, and his location, I would estimate his hourly rate to be around $75, which is a reasonable rate for a linguistically diverse professional in the United States.