[5] In 1998, he made his debut with the first team in a Delta Ethniki match against AO Chalkida and since then he was considered an indispensable member of the local Heraklion club.
[6] He made his league debut on 3 February 2002, in an away match against Ethnikos Asteras which OFI won 3–2,[8] coming as a substitute for Manolis Dermitzakis in the 75th minute.
[9] By the time Roubakis left OFI three years later, he made a total of 58 league appearances for the club[10] and scored the winning goal in a 2–1 away victory against Aris on 28 September 2003.
[22] He made 25 appearances in the 2005–06 Alpha Ethniki,[23] a season which ended with mixed feelings for the team, as the top-half favorites only escaped relegation during the league's final matchdays.
[29] Before the start of the 2007–08 season, Roubakis was linked to newly promoted Beta Ethniki champions Asteras Tripoli,[30] but a move did not materialize – instead, he voted by his OFI teammates as third captain behind Goran Drulić and Pierre Issa.
Roubakis was a regular starter at the club during the 2010–11 season as well, however a bad performance during a 1–4 home defeat against Panathinaikos briefly put teammate Tomasz Wisio in contention of the left back position.
[45] After his Ergotelis contract was terminated, Roubakis struggled to find a suitable Greek or Cypriot club that would employ him – a return to Atsalenios in the Delta Ethniki or an early retirement were on the table.
[46] Finally in late January 2012, after months of inactivity, he signed a six-month contract for Gergeri-based Rouvas FC, a capture which was considered magnificent for a Football League 2 club.
[54] Roubakis found himself a free agent yet again, and during the summer transfer period of 2013 he was rumored to join a number of clubs, but instead he decided to return to Rouvas one year after his departure.
[66] On 7 November 2010, still a player of Ergotelis at the time, Roubakis was a candidate for the municipal council of Heraklion at the 2010 Greek local elections – he gathered 1054 votes in the 4th administrative division of the city but did not win a seat.