From my own experience, I understand, being on call could be important for engineers, but CEO MUST understand, not all people could accept this. So, in real li

From my own experience, I understand, being on call could be important for engineers, but CEO MUST understand, not all people could accept this. So, in real life, need agile approach. Some people just accept to be on call all time, you could consider them as your core team with appropriate benefits and value them, and respect them, really. Second group of people could accept receive calls during their shift. This is also not bad. Value this. And exists people, who are good workers, make great value, but could be on call very limited time or nearly no time. You should decide, with them individually, how you will work. It is really possible, some very valuable people will not be on call at all.