Gavel is a Flask-based web application designed for ranking projects at events like hackathons using pairwise comparisons. The system presents judges with pairs of projects to compare, updating rankings in real-time via a Bayesian inference algorithm. Key components include a custom SQLAlchemy class for serializable transaction isolation, a standalone ranking algorithm module (crowd_bt.py), and utility functions for data handling and security. The application uses PostgreSQL for data storage, Celery for asynchronous email tasks, and relies on Redis as a message broker. Admin interfaces allow managing projects, judges, and global settings, with real-time updates to project rankings displayed via the Mu parameter.