ECS_RS
Research scientists
Invent or validate new plasma regimes, chemistries, chamber materials, surface interactions, and residue-removal mechanisms.
Typical titles: Plasma scientist; surface scientist; cleaning chemist; materials scientist
Public observability: Medium
ECS_PE
Production engineers
Own recipes, DOE, process windows, installation debug, chamber match, customer ramp, and failure analysis.
Typical titles: Etch process engineer; clean/strip process engineer; application engineer; field application engineer
Public observability: High
ECS_TE
Technicians
Run PM, swap consumables, execute checklists, resolve first-line faults, and support release-test or install work.
Typical titles: Equipment technician; installation/debug technician; test technician; cleanroom maintenance technician
Public observability: Medium
ECS_TK
Tacit production know-how
Chamber seasoning; alarm triage; tool matching; handoff timing; residue-risk intuition; fab etiquette during ramps.
Typical titles: Held by senior process engineers; senior field engineers; shift leads; master technicians
Public observability: Weakly observable