The Alianza organization says: It all began in September 2013, at 7UP Sueño Alianza National Finals, when Chivas, US Soccer, Mexican Soccer Federation and Xolos de Tijuana extended tryout invitations to him, after a lengthy tryout process. Although, he first practiced with Xolos, Chivas captivated the 17-year-old goalkeeper from Vallejo, California. ... Carlos finalized his registration in late January... http://www.alianzadefutbol.com/nota.php?id=397&lang=en He's not currently in the Mexican fed's database that I could find. Was affiliated with Marin FC according to this page: http://www.marinfc.com/mfc/index.php?option=com_content&view=article&id=1822
From mid-July: As for Chivas’ junior team, Carlos Saldaña and David Silva (both goalkeepers) are in their training process and will be under the protection of Luis Michel, who is back to Chivas after his experience with Saprissa (Costa Rica). http://www.alianzadefutbol.com/nota.php?id=457
Article on the two in the picture above (in Spanish): http://www.alianzadefutbol.com/nota.php?id=604 Doesn't say much other than they are both at Chivas after going through Sueño Alianza.
He seems to still be at Chivas. He was not born in the U.S., according to his LIGA MX page, but he of course could still be a Yank: http://ligamx.net/cancha/jugador/103456/eyJpZENsdWIiOiAzOX0=/carlos-alberto-saldaña-moreno
Back in the US. Signed with Sacramento Republic this morning. Has reportedly been training with the club for a while. According to the Sac Republic press release, he was the goalkeeper for Chivas's run to the reserve league final in 2019, and spent some time on loan with Tepatitlan in the second division. https://www.sacrepublicfc.com/news_article/show/1183644/