He was released at the end of the season, joining Conference side Tamworth in June 2004[4][5] but left in July without playing a single game for the Lambs.

In contrast to his uninspired form with Dublin City, Hynes proved markedly more productive in the colours of Dundalk, whom he joined in 2005, scoring six goals from midfield in 2005.

He formed, alongside Philip Hughes (with whom he played at Dublin City) one half of a prolific forward pairing which manoeuvred Dundalk into a strong position in the League of Ireland First Division.

Hynes parted ways with Derry City at the end of the 2007 season to join new League of Ireland franchise Sporting Fingal who were making their debut in the 2008 First Division.

Hynes was a regular figure in the Sporting Fingal squad where he formed a successful partnership with Robbie Doyle.

In all competitions Hynes contributed 11 goals in 38 games alongside numerous[clarification needed] assists for the new league outfit as they finished 3rd in the First Division.

[10] Hynes made his Shelbourne debut on 6 March 2009 during a 2–1 victory over Wexford Youths at Tolka Park.