What is a Field Services Supervisor?
As well as attending onsite jobs, field services supervisors have a team of field service operatives working under them to ensure efficient responses to any IT or telecommunication issues customers have.

https://www.fieldengineer.com/skills/field-services-supervisor-ericsson

While still needing reliable technical knowledge themselves, a field services supervisor must both hire and train staff members. The role involves working alongside employees to visit customer needs in the field, including maintenance and repairs on a variety of equipment and machinery.