Engineer

ingeniera

(person engaged in designing, constructing, or maintaining engines or machinery; (more generally) a person qualified or professionally engaged in any branch of engineering, or studying to do so)

ingeniero

(person engaged in designing, constructing, or maintaining engines or machinery; (more generally) a person qualified or professionally engaged in any branch of engineering, or studying to do so)

maquinista

(person who drives or operates a locomotive)

manipular genéticamente

(to use genetic engineering to alter or construct (a DNA sequence), or to alter (an organism))