Unfortunately many employers don't think so. As a mathematician/physicists, you'd have to sell yourself as a engineer at the same time as convincing your employer that you're more qualified than someone with an engineering degree.
It does take some self-investment, but you have a flexibility not afforded by most disciplines - math & physics best prepares you more generally if you apply the lessons. I feel confident innovating/performing in many other aspects as well, but I chose software engineering & the developer crunch chose me.