brutalist

Pertaining to Brutalism, a style of modernist architecture characterized by the use of board-marked concrete

[...] after the original Victorian station was demolished and then entombed in concrete in the 1960s, Birmingham New Street became a byword for the worst excesses of the much-loathed Brutalist architecture so widely used to reconstruct inner-city post-war Britain.

An architect who used this style

Someone that follows brutalism.