On loan from Panathinaikos in 2007–08, Zaradoukas helped Panserraikos earn promotion from Beta Ethniki to the Greek Super League.
On 29 December 2011 he signed a six-month loan deal with PAS Giannina, as he didn't feature in the plans of his coach.
In June 2013, Zaradoukas was released from Olympiakos, and he signed a two-years contract with Asteras Tripolis.
At the beginning of 2014, Zaradoukas signed a six-month contract with Platanias and made his debut with the club on 3 March 2014 in a 1–2 home loss against PAS Giannina.
His first competitive match for the national team was during a successful 1–0 win against Israel for the EURO 2012 qualification round.