algorist
/ˈalɡ(ə)rɪst/noun
1A person skilled in the use of Arabic numerals in arithmetic. Chiefly historical.
2 Mathematics and Computing. A person skilled in writing or using algorithms.
Origin
Mid 17th century; earliest use found in Thomas Blount (1618–1679), antiquary and lexicographer. From post-classical Latin algorista from algorismus, on the analogy of Latin nouns in -ista corresponding to nouns in -ismus.