Keep in mind that we regularly see magical ways to protect technology from Hexing in the Files. Spoilers abound, from Storm Front to Changes. Harry's charm\spell on the Larry Fowler show, Mac's Bar has fans, running lights, etc., Butters and the magic circles to protect the GPS, Marcone's mansions are all warded with powerful spells, but the cameras still function normally (or seem to). And lastly, Odin's super computers.
I think it's perfectly reasonable that someone who made it their focus (especially a Scion of Vulcan) would be able to design his\her technology to be protected. Maybe it's just a natural Hexing shield coming off of the scion, maybe it's runes engraved into the cases of technology to help magic slide off them, maybe it's just that the character's background enables technology to magically work. Either way, that's an awesome character idea, and seems to fit into the setting perfectly.