Most recently, he has hosted the RTÉ 2fm Breakfast Show on the radio and has hosted the TV specials The Voice of Ireland and the Eurovision Song Contest for Teens Ireland. He started his career as the host of TG4’s music program POP4. Abroad, he has hosted Xfm Drivetime on UK radio and told Love Island Australia on TV.

McDermott was born in Limerick but grew up in Dublin. His father is writer Kevin McDermott. He was the second eldest, the only boy of two sisters. His sister, Roe McDermott, is a film critic for Hot Press magazine.
When he was younger, before working in the media, McDermott wanted to be a police officer (police officer) or a school teacher.
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Fluent in Irish, McDermott began his media career with TG4’s POP4, a musical request and Top 40 show. This was followed by a role in TG4’s teen drama Seacht, in which he played the main character Pete. From here, he turned to POP4, a weekly chart-topping music show featuring live bands. Other presenters followed, including Frenemies – RTÉ2’s youth debate game show and Immeal Geall, BBC Northern Ireland’s bilingual magazine programme. In November 2012 he co-hosted a series of film shows on RTÉ2.
In 2008, McDermott competed on MTV UK’s Pick Me MTV but lost to Laura Whitmore.
McDermott made his UK TV debut in September 2013, appearing on Channel 5 UK’s reality show Celebrity Super Spa. Other credits include highlights from the 2013 Totes Amazeballs and Next Year’s News, a satirical comedy panel show that brings big news to the people of the coming year. Both series air on RTÉ2. He has co-hosted The Voice of Ireland with Kathryn Thomas since its inception. For Season 3 of The Voice, McDermott hosted a live show on RTÉ2. In summer 2014, he filmed a new series for RTÉ2 called Drunk, exploring the effects of alcohol on the mind and body.
In 2015 he began hosting Junior Eurovision Eire, the national selection program for the Irish Junior Eurovision Song Contest, which he hosted from 2015 to 2019. Ireland did not participate in 2020, with Louise Cantillon replacing him as host for 2021. He also filmed a pilot episode of a British game show in Paris produced by the team behind Gogglebox.
In June 2020, he hosted the RTÉ Does Comic Relief telethon to raise funds during the COVID-19 pandemic.