Before joining Radio 1, Eleri presented on BBC Radio Cymru in 2018.[2][3]
Eleri covered Phil Taggart's Chillest Show on BBC Radio 1 during Christmas 2019.[1] In November 2020, it was announced that Eleri would permanently take over Phil Taggart's show following his departure from the station. On 20 April 2021, further timetable changes were announced as it was revealed Annie Mac would leave the station. In addition to hosting the Chillest Show, Eleri has hosted the Power Down Playlist every Monday to Wednesday night since September 2021 from 10-11pm.[4] The programme is also streamed on Radio 1's sister station, BBC Radio 1 Relax, which closed down in July 2024.[5] On 15 April 2024, Eleri became a presenter for Radio 1's Future Artists show, replacing Jack Saunders as he went on to take over the New Music Show from Clara Amfo.
Eleri curates an event series of artist performances titled Tonna (translating to the colloquial form of waves in Welsh).[6] The event is held at the venue OMEARA, London. Previous artists who have performed include Jordan Stephens, Lucy Blue and others.[7]
On 15 August 2023, Eleri's four-part horror documentary series Paranormal: The Girl, the Ghost and the Gravestone was broadcast on BBC Three and released as a boxset on iPlayer.[8]
Further series of Paranormal have been produced. In 2024 she investigated UFO sightings in Broad Haven[9] and in 2025, Helen Duncan, in Britain's Last Witch.[10]
On 22 December 2023, Eleri was announced as the new host of Selector Radio, replacing Jamz Supernova on the global radio show.[11]
In 2025 Eleri was the presenter for the Welsh language television singing competition, Y Llais, broadcast on S4C from 9 February.[12]
In 2026, Eleri presented a BBC 2 Wales Keep the World Away - Finding Gwen John to accompany the exhibition about the Welsh artist at National Museum Cardiff.[13]