noun
senior chief engineer
A senior-level engineering position, typically in a research or technical organization. The title implies leadership and deep expertise.
彼は大手メーカーの主幹研究員として新製品の開発を率いている。
He leads the development of new products as a senior chief engineer at a major manufacturer.
Compound of 主幹 (chief, head) and 研究員 (researcher, research staff). The exact historical derivation is uncertain; the term is a modern occupational title.