A person who uses scientific knowledge to solve practical problems WordNet 3.0 & Open English WordNet

Engineers, as practitioners of engineering, are professionals who invent, design, analyze, build and test machines, complex systems, structures, gadgets and materials to fulfill functional objectives and requirements while considering the limitations imposed by practicality, regulation, safety and cost. Wikipedia

Professional practitioner in various disciplines of engineering. Wikipedia Disambiguation

professional certification for Civil engineers in some jurisdictions Wikidata

Professional certification for Civil engineers in some jurisdictions Wikidata

A person who uses scientific knowledge to solve practical problems. OmegaWiki

A scientist or an engineer who specializes in a particular technology, or who uses technology in a particular field. Wiktionary

A scientist or engineer who specializes in a particular technology. Wiktionary (translation)