in France I think we choose the gender of the french word when possible, otherwise it seems to default to masculine? un job -> because of "un emploi, un boulot

in France I think we choose the gender of the french word when possible, otherwise it seems to default to masculine? un job -> because of "un emploi, un boulot, un travail" une [surprise] party -> because of "une fête" un hashtag -> masculine because we don't see an "e" at the end??