My work involves defining job roles and the skills necessary to perform them. I've seen job titles for both "Scrum Master" and "Senior Scrum Master." I'm NOT a scrum practitioner myself, so I'm trying to figure out whether practitioners believe this is a bonafide distinction. I've seen some discussions on other sites which suggest that the "Senior Scrum Master" title is something used by employers to simply distinguish experienced practitioners from those with less experience and perhaps to offer higher salaries. I've also seen comments indicating that a "scrum master is a scrum master" and that there is not a "senior" role recognized within scrum practice.
I'm hoping to get some clarity on this from the group and perhaps even see whether there is a consensus viewpoint on this. If you believe there IS a difference between the two titles, what are the differences in the scrum-related skills associated with each title?
Thanks in advance for your help on this.