Houdek started his darts career in August 2017 and in two years he won numerous international tournaments for youth players.

In 2019, during the EDU European Darts Championship, he won the gold medal in the single youth competition, defeated Marcel Grossmann in the final match.

[1] In the boys' pairs competition, together with Vilém Šedivý, won the silver medal, lost to Keelan Kay and Brad Phillips from England in the final match.

[2] In 2019, again together with Vilém Šedivý, won the silver medal in the pairs competition at the 2019 WDF Europe Cup Youth.

In the boys' under-21 singles event, he won the gold medal, defeated David Zaruba in the final by 6–5 in legs.