key worker

/K IY1 W ER0 K ER0/
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.

Source: https://en.wiktionary.org/wiki/key%20worker, https://en.wiktionary.org/wiki/keyworker