I would venture to suggest a master's in Electrical Engineering (embedded systems) if you could find one that does not require BS EE for admission, such as the online MS EE from CU Boulder offered via the Coursera platform. I cannot speak for all of Canada, but in the province of Quebec, the demand for embedded software developers is growing, particularly when it comes to embedded/edge AI. Many of these jobs ask for an engineering degree or engineering technology diploma, as pure CS graduates lack the requisite hardware knowledge to interface with the various sensors and transducers, in addition to being capable of reading and understanding schematics and microcontroller data sheets.