The person who tends a door
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linguistic
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porter
doorkeeper
+
-o
noun suffix
Portero means doorman and is a cognate of the English word porter0, the person who tends the door.
portero
doorman, concierge, superintendent
The person stationed at a building's door who watches the entrance and helps residents and guests.
El portero del edificio me ayudó a subir las maletasThe doorman of the building helped me carry up my suitcases
La portera conoce a todos los vecinosThe concierge knows all the residents
goalkeeper, goalie, keeper (sports)
In sports like soccer, the goal is la portería, so the portero is the goalkeeper who guards it.
El portero atajó el penalti en el último minutoThe goalkeeper stopped the penalty in the last minute
Nuestra portera no dejó pasar ni un solo golOur goalie didn't let a single goal in