An engineer trained to design and construct and maintain public works (roads or bridges or harbors etc.) WordNet 3.0 & Open English WordNet

A civil engineer is a person who practices civil engineering – the application of planning, designing, constructing, maintaining, and operating infrastructure while protecting the public and environmental health, as well as improving existing infrastructure that may have been neglected. Wikipedia

Engineer specialising in design, construction and maintenance of the built environment Wikidata

An engineer who is specifically trained for and/or specialised in civil engineering. Wiktionary

Engineer specialised in civil engineering. Wiktionary (translation)