In 2004, his first season with the Gauchos, Nuñez played in 23 games (starting 6), scoring 2 goals and adding 6 assists.

In addition to Nuñez, the UCSB's 2004 team also featured several other now-professional players including Tyler Rosenlund, Andy Iro, Bryan Byrne, and Ivan Becerra, and the Gauchos marched all the way to the 2004 Division I Men's College Cup, losing on penalties to Indiana University.

His first action with the RSL first team came in the Lamar Hunt U.S. Open Cup against the San Jose Earthquakes on April 30, 2008.

The following season, Nuñez found playing time more difficult to come by, making just three appearances during RSL's 2009 MLS Cup-winning campaign.

In April 2010, Nuñez signed with USSF D-2 Pro League club Rochester Rhinos for the 2010 season.

NSC Minnesota Stars of the North American Soccer League signed Nuñez on March 22, 2011.

[8] Nuñez returned to his high school alma mater in 2010 and served as varsity head coach and program director of Millikan HS girls soccer.

"[9] In 2014, Nuñez began coaching at FRAM SK in the South Bay area of Southern California, where he serves as Programs Director.

[11] In June 2024, Long Beach City College announced Nuñez as the Head Coach of the Women's Soccer program.