Porter can be 1) porteiro 

                         2) portador, carregador. 

    "Porter: a person whose job is carrying people's bags and other loads, especially at a train station, an airport or in a hotel."

   In the above exempo, a "porter' would fit the definition 2)   

                     Notice: In BrE, a porter may be the guy of definition (1), porteiro.

                     In airports the guy that carry yours bags and suitcases is the "porter".

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    Doorman: a man, often in uniform, whose job is to stand at the entrance to a large building such as a hotel or a theatre, and open the door for visitors, find them taxis, etc.

    It´s the doorkeeper (porteiro), o guarda-portão.