Synonyms for Engineer (same or very similar meaning)
WordNet sense 1 (the operator of a railway locomotive):
engine driver, locomotive engineer, railroad engineerWordNet sense 2 (a person who uses scientific knowledge to solve practical problems):
technologist, applied scientistWordNet sense 3 (plan and direct (a complex undertaking)):
direct, mastermind, orchestrate, organize, organiseFrom the ODE community, based on WordNetadd/edit