I Code It

16K subscribers • 135 videos

👋 Hi, I’m Juntao — a software developer, author, and content creator who helps developers write cleaner, more maintainable frontend code. On this channel, I share practical coding walkthroughs, real

Latest Videos

8:30

How Would You Design a Rich Text Editor?

692 views 4 days ago

16:20

10,000 Shapes, 12 Hit Tests — Implementing a Quadtree

1.6K views 3 weeks ago

14:37

Collaborative Drawing: Conflicts, Presence, and What to Sync

1.4K views 1 month ago

18:17

How Excalidraw Handles 10,000 Shapes (Frontend System Design)

10.4K views 1 month ago

12:05

How YouTube Changes Video Quality Mid-Playback

1.4K views 1 month ago

13:24

Media Source Extensions Explained — How Video Streaming Works

5.3K views 1 month ago

13:48

Frontend System Design Essentials: React Profiler API Explained

6.0K views 2 months ago

13:12

Frontend System Design: Performance API, Chrome, React Profiler

4.9K views 2 months ago

19:07

How to Read a Chrome Flame Chart (Without Getting Lost)

1.6K views 2 months ago

13:26

Coding Makes It Work. Engineering Keeps It Working.

719 views 3 months ago

14:19

I Turned a Broken RC Car into a Robotics Platform

325 views 3 months ago

14:16

What Building a Face-Tracking Camera Taught Me About Software Engineering

477 views 3 months ago

19:50

Frontend System Design Essentials: Frontend Caching Explained

11.6K views 3 months ago

16:25

Frontend System Design Essentials: Data-Heavy Frontend Apps

33.5K views 4 months ago

2:51

How ChatGPT-Style Streaming UI Works #systemdesign #coding #frontendcourse

725 views 4 months ago

9:54

Frontend System Design Essentials: Streaming UI Explained

2.8K views 4 months ago

2:29

This Tiny Data Mismatch Can Break Your Frontend #frontend #systemdesign #coding

2.6K views 4 months ago

14:01

Frontend System Design Essentials: Client Schema Drift Explained

1.4K views 4 months ago

13:42

How to Structure a Frontend System Design (Interviews & Architecture Reviews)

2.6K views 4 months ago

11:07

How Senior Frontend Engineers Think in System Design Interviews

2.1K views 5 months ago

11:51

Frontend in 2026: Why AI Will Replace "React Coders" First (And How to Survive)

2.9K views 5 months ago

15:20

Learning to Code Is Still Worth It in 2026

868 views 5 months ago

13:49

Agentic Coding: How to Organize AI Agent Tools

1.4K views 5 months ago

21:31

Build a Working AI Agent Without the Frameworks

1.3K views 6 months ago

7:50

The Learning Method I Use for Any New Skill

1.3K views 6 months ago

15:29

Agent Skills Explained: Encode Your Team’s Workflows

3.7K views 6 months ago

10:14

Agentic Coding Explained (Frontend Mental Model)

3.2K views 7 months ago

14:46

Core Web Vitals Explained: LCP, INP & CLS

3.0K views 7 months ago

11:38

From Google Docs to Figma: OT vs CRDT Trade-offs

3.6K views 7 months ago

8:50

Frontend System Design Essentials: Reordering Lists at Scale (Without Breaking Everything)

1.8K views 7 months ago