ML System Design Weekly by Yayun | Substack

How I'd Build Ads at ChatGPT from 0 → 1

If I Were the Architect, How Would I Do It?

Mar 17 • Yayun Jin

CPM (Cost per Mille) vs oCPM (Optimized CPM) vs eCPM (Effective CPM)

A detailed (but concise) explanation of those three confusing terms in ads systems.

Mar 18 • Yayun Jin

The Full Ads System: End-to-End

Think of it as a funnel with feedback loops. There are roughly 5 layers:

Mar 15 • Yayun Jin

Software Engineer → Machine Learning Engineer: Start Here.

A Practical ML Interview Course for Software Engineers

Dec 11, 2025 • Yayun Jin

A Quick Guide to AI/ML Roles in 2025 (with Mind Map)

A quick, visual guide

Nov 20, 2025 • Yayun Jin

Most Popular

The Full Ads System: End-to-End

Mar 15 • Yayun Jin

Your 2024 Guide to Machine Learning Engineer Interviews

Mar 14, 2024 • Yayun Jin

Software Engineer → Machine Learning Engineer: Start Here.

Dec 11, 2025 • Yayun Jin

A Quick Guide to AI/ML Roles in 2025 (with Mind Map)

Nov 20, 2025 • Yayun Jin

ML System Design Weekly by Yayun

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