Shipplanners are responsible for the loading plan of the ship. Their role is very important: the safety of the crew, of the ship, and the profitability of the journey are key aspects of his trade.
They indeed design the load plan of the ship taking into account: the type of goods carried (hazards, perishability), destination and weight of the containers.
They are employed by the shipowner/maritime agent.
Source: multiple Internet sources, specialized literature, testimonials (Pratic-Export, Pôle-emploi cards, Wikipedia, Onisep, CNRTL, Umep à la Page…)