While at university, Cardy wrote and performed for several arts revues in addition to his own sold-out comedy festival shows. Around this time, he played drums for Sydney band the Lulu Raes. That year, he also began working with the radio station
Triple J on its popular "Song Sequels" segments, in which he produces parodies of famous songs. He released his debut EP,
Artificial Intelligence, the following week. On 12 August, he was a guest on Triple J's
drive time program
Hobba and Hing, where he discussed how the EP came to be made. On 9 September, he released the single "Fruit Salad". On 20 October, he was nominated for the Craft Award for Writing at the
11th Streamy Awards. On 3 November, he was shortlisted for the audience-voted Favourite Digital Content Creator Award at the
11th AACTA Awards, On 23 January 2022, Cardy had two songs voted into Triple J's
Hottest 100 of 2021 when "Mixed Messages" and "
H.Y.C.Y.BH" were respectively ranked at No. 17 and No. 11. On 9 February, he was cast alongside musician
Montaigne in the
SBS musical comedy
Time to Buy. On 21 February, he was featured in an interview published by
Rolling Stone Australia. In the interview, he discussed his sudden popularity on
TikTok and explained that his success mostly comes from creating a number of extremely short songs designed to be shared online, some of which get expanded into full-length songs. On 6 August, he uploaded the video for a new song titled "Hey, I Don't Work Here" and announced that his debut studio album would be released in the near future. The album, titled
Big Dumb Idiot, was released on 9 December 2022. In 2023, Cardy continued to release singles such as "H.S", "Beautiful Mind" (featuring
Brian David Gilbert), and "Perception Check". In 2024, he co-wrote a song for the
Orpheus DLC of the video game
Stray Gods: The Roleplaying Musical, which was released on 27 June. He also featured on the
Ninja Sex Party song "Dance 'Til You Stop" and alongside Montaigne on the
TWRP song "Online". His second studio album,
The Dancefloor at the End of the Universe, was released on 18 October 2024. After the release of his second album, he continued to release singles such as "Walk" on 15th September 2025, and "Mind Fight" on 31st October 2025. ==Musical style==