[2][1] Her first job was at the Auckland Regional Authority, followed by positions in small architectural firms.

Mike Dowsett joined the company shortly afterwards and it was renamed Scarlet Architects.

[3][4][5] In 2018, Naismith and Aimer created the Scarlet Prize in Architecture, awarded annually to a high-achieving female student at the University of Auckland.

[10] In 2009, Aimer and Naismith designed and built identical townhouses, with shared common areas, in Newmarket for themselves and their extended families to live in.

[11] Dubbed "a social experiment", the design allowed for experimentation of community, intensification, and intergenerational living.