noun
A person who adheres to or embodies bureaucratic methods, often with a negative connotation of red tape and inflexibility.
彼は典型的な官僚主義者で、規則にしか従わない。
He is a typical bureaucrat who only follows the rules.
官僚 is a more general term for a government official or bureaucrat, while 官僚主義者 specifically emphasizes the person's adherence to bureaucratic principles or red tape.
Compound of 官僚 (bureaucrat) + 主義 (principle, -ism) + 者 (person). The term is a straightforward Sino-Japanese construction.