This document describes the Encode StarkNet Autumn Hackathon. The hackathon challenges participants to build a blockchain project on StarkNet over 4 weeks. Participants can work individually or form teams, and will receive support from Encode Club mentors and StarkWare. The top 10 projects will pitch at the finale on November 17th for a chance to win prizes up to $7,000. Resources on StarkNet and Cairo will be provided, along with technical workshops, to help participants complete their projects.