One place to start are the cruise line websites. They all have a link to empoyement. I believe Stiener has the contract for most of the ship's salons.
Spa & Beauty Salon
This operational area is managed by a concenssionaire. If you are looking for employment in the Spa and Beauty Salon area, please apply directly with the following concessionaire.
Please note that NCL Fleet Personnel does not hire for this position, you must contact the concessionaire directly to be considered