Jiarui (Jerry) Xu
Still Learning Machines
jiarui.c.xu@gmail.com
Writings
Self-Evolving Software is Eating the World
April 14, 2026
My Bitter Lessons
January 7, 2026
Product Lessons I Learned from Teaching People Zoom
November 15, 2020
Active Projects
Products
Uncapped
Mortality countdown app with life battery widget
Give Me A Break
macOS menu bar app for break reminders and posture
Hold To Talk
Private, open-source voice dictation for macOS
NewGrad.ai
AI-powered career tools for new grads *
GBDT Research
JAXBoost
JAX autodiff for XGBoost/LightGBM objectives
Awesome GBDT
Curated list of GBDT resources
OpenBoost
GPU-native, all-Python platform for tree-based ML *
AI Research & Education
microTabPFN
Minimal TabPFN in ~210 lines for education
Micro RL
Reinforcement learning agents for Codenames *
AIpedia.org
AI encyclopedia and learning resource
transformer101.com
Learn transformer architecture from scratch *
agentology.org
Anthropology for Agents *
Community
OpenRegulations.ai
AI analysis for regulations.gov
* in active development. coming soon in Q1 2026
Select Inactive Projects
East Bay FeedER
— Fed frontline hospital staff & supported local restaurants
Mission Bit
— CS education for underserved youth in SF
Code Nation
— Tech education for under-resourced high schoolers