Alaska Seaplanes in JNU hires part time summer people. Wings of Alaska did as well, but they are being folded into the Alaska Seaplanes cert. There are a few operators up north that hire seasonal people as well. The best way to get looked at is to buy a ticket and go up there and knock on doors. Most places start hiring pilots for the summer season around February or March. Good luck! My time up there was the most fun I've ever had flying.