Being on call is separable from your role as a software developer and can be compensated separately. My wife’s (non-technical) organization has a requirement for a junior and a senior duty officer to be available 24/7/365. These shifts are compensated and available for people to sign up for. If shifts don’t get filled, they fall to senior managers in a rotation. You can be sure these managers somehow pay enough that they only very rarely need to take shifts themselves.