For FOīs, minimum for mataxi is a float rating (either SE or ME) and a valid ICAO CPL licence..
Only real chance for low hour guys to get in there is to know somebody working there, best of course to know the chief pilot..
mataxi is operated by Ken Borek Air in Canada..
Not sure about TMA, but what I have heard is Martaxi the more desireable company to work for, according tīs and cīs..