принять на должность(Вариант employ скорее выражает *состояние*, чем действие, работу *в течение какого-либо срока* на некой должности • Last year I was hired as a financial analyst for Coastal Airlines.ART Vancouver)
зарекомендовать себя(Yulia has proved herself to be a very reliable worker. • Hugo Lloris has grabbed his chance to prove himself as one of the best goalkeepers in the world.ART Vancouver)