Hacktech is an annual intercollegiate coding competition organized by a team of Caltech undergraduates. This year, the event was held from March 3-5, 2023 and over 400 students from 53 universities across 10 countries participated. The hackathon focused on sustainability and students created projects to address issues in this area. Los Angeles-area high school students also joined the event virtually. The opening ceremony was led by Jonas Peters, Bren Professor of Computation and Neural Systems and Control & Dynamical Systems.