Jianchao Li
I build with AI.
Welcome to my corner of the internet. I’m a software engineer who builds with AI. Here I write about deep learning, computer vision, investing, and building things with AI.
Portfolio Playground
A web app for building custom investment portfolios, visualizing historical performance, and comparing risk/return metrics.
Browser ML Demos
Interactive machine learning demos that run entirely in your browser using Transformers.js. No server required — all inference happens locally on your device.
Interactive Math Demos
Explore fascinating mathematical concepts through interactive visualizations and simulations — right in your browser.
Posts
Rate Limiters
I will explain five algorithms for rate limiters with example Python implementation: token bucket, leaky bucket, fixed window counter, sliding window log and sliding window counter.
Understanding Backpropagation
··13 mins
I will explain how to understand and implement backpropagation, the mechanism used to train AI models, with computational graphs and intuitions.
No, AI Is No Longer a Hype
·7 mins
Some people still dismiss AI as a hype that can only handle simple tasks. I disagree. Here’s how AI has fundamentally changed the way I write, learn, and build.
Vibe Coding Portfolio Playground
·6 mins
I built a portfolio analysis tool entirely through vibe coding — 100% of the code was written by AI. Here’s what I made and what I learned.
Why Every Software Engineer Should Use AI
··4 mins
This post shares my perspectives on why every software engineer should use AI — a cultural shift as significant as any we’ve experienced.
The Double-Edged Sword of Compounding
While many investors understand the power of compound returns, they may not fully grasp that compounding can also result in a significant downside. This post explores this double-edged sword.