[wakawaka28]

That depends very much on what kind of software you are writing and how good you are at it. I do not think math makes as much sense as CS for general software jobs. It might not count against you very much, but I wouldn't go so far as to say you're on the same footing as someone who dedicated their entire studies to CS. There are way worse backgrounds you could have besides math IMO. I would not want to be an English graduate who switched to software engineering. I've heard of some of those people.

Software engineering is unique among engineering fields in that it accepts people without the right credentials, and sometimes without any credentials. Other engineering fields not only require matching credentials but also have professional certifications. I don't think I would enjoy taking those very much, but after seeing some of the crap that people get away with I have fantasized about having such a process to filter people out.