keyworker

Short definition from Wiktionary

Noun

1. 1
   A social worker who helps to coordinate a patient's care and their social welfare, finances, career, etc.
2. 2
   A childcare worker who monitors a child's development and participation in activities and discusses these with the child's parents or carer.
3. 3
   A worker in any industry who is considered indispensable and expected not to strike.