In 2010 he won the Carris Trophy, the English Boys' under-18 open amateur stroke play championship, at Woodhall Spa.

In 2013 he won the English Amateur, beating Matt Fitzpatrick 4&3 in the final at Frilford Heath Golf Club, leading to his selection for the Walker Cup team the same year.

A good finish to season, with a third place in the season-ending NBO Golf Classic Grand Final, lifted him to 13th in the Road to Oman rankings and gave him his European Tour card for 2016.

In November 2020, Shinkwin won the Aphrodite Hills Cyprus Open by defeating Kalle Samooja in a playoff to claim his first European Tour title.

[3] In August 2022, Shinkwin won his second European Tour event at the Cazoo Open at the Celtic Manor Resort in Wales.