This is the 17258th most frequent Russian word.
судьей
The Russian word "судьей" means "judge" (instrumental case).
Here, 'судьей' (judge) is used as a predicate nominative indicating the profession or role acquired.
Он стал судьей после долгих лет учебы.
He became a judge after many years of study.
In this example, 'судьей' is used nominally referring to the profession or position being offered.
Ему предложили работу судьей в городском суде.
He was offered a job as a judge in the city court.
The word 'судьей' here refers to the capacity in which the person worked, emphasizing their role.