Robotics, making things, coding, math, and rock climbing.
These are the threads I keep coming back to. Some have their own pages on this site (the ones with arrows below). The rest are things I spend time on without a project to point at, mostly classical Euclidean geometry and the small bits of math that hide inside everyday systems.
Most of what I make ends up sitting somewhere between math and software. I like building tools that other people can use to make things they couldn't otherwise make.

Robotics
FTC robots through Team Axiomatic, where I work across CAD, electronics, software, and autonomous routines. The loop of writing code, watching the robot fail in physics, and tracing the bug back through software, mechanics, and materials is the part I like most.

Making things
Fusion 360, 3D printing, and laser cutting at home. Brackets, mounts, custom hubs, fixtures: the things I can't buy. CAD is also a thinking tool that catches design mistakes before any material gets cut.

Coding
Whatever language fits the problem. Python for ML and quick scripts, TypeScript for the web (this site, Story Galaxy, Angulus), Java for FTC, C++ for competitive programming. I like coding most when it's the means to something else.
Climbing
Bouldering, mostly. Trying to improve after a long break.