Sommerin's first full-time job cooking was as a commis chef at the Cwrt Bleddyn Hotel, Llangybi.

[1] Then, aged 16, he headed to the Farleyer House Hotel in Aberfeldy, Scotland, where he trained further under Richard Lyth, who gave him his under-stated French style.

[5][6] Returning to Wales to be closer to his family, Sommerin joined The Crown at Whitebrook, Monmouthshire in 2000 as Sous Chef.

[10] In July 2021 Sommerin started a new venture called Home, in Stanwell Road, Penarth.

[11] Having been selected as one of the Chefs to Watch in 2008 by The Guardian,[6] Sommerin represented Wales in the 2009 final of the BBC's Great British Menu, having beaten Stephen Terry.