 He served as the head of the bank Norðoya Sparikassa from 1919 to 1976.Zachariasen was mayor of the Municipality of Klaksvík from 1930 to 1934.He served as a representative of the Home Rule Party for the Norðoyar district in the Faroese Parliament from 1928 to 1943, and again from 1946 to 1956.