BenjaminKataoka

I play fantasy football on both Sleeper and ESPN, and checking on my teams meant bouncing between apps. The tools that pull everything together mostly sit behind a paywall, so I built my own.

It puts every team I own on one board, picks the best legal lineup for each league's rules (FLEX, Superflex, DEF), and ranks which free agents would actually beat one of my starters over the next four weeks.

Profiling showed the login check was calling Clerk's API on every request; limiting that to first-time users cut typical latency from 365 to 251 ms. An audit of every route that takes an ID closed a bug in five of them that could have shown someone a stranger's roster.

Fantas.ai runs entirely on free tiers, and every provider has a different limit that breaks something when you hit it. Burnrate watches all of them in one place.

A small Python service on an Oracle Cloud VM checks Neon, Clerk, Vercel and Oracle every 15 minutes, keeps its own history, projects when each limit will be hit, and warns me on Discord while there's still time. A native Mac app built with Tauri shows it all at a glance.

A reinforcement-learning project: I built a custom Gymnasium environment and trained PPO and DQN agents on it.

I shaped the rewards around staying centered in the lane, avoiding collisions and keeping up speed, until the agents ran off the track far less often.