---
title: "Dayul Lee (@dayul) | Hashnode"
description: "Management informs. Engineering decides.\nCode is strategy. Every architecture decision has a reason. Read the latest articles by Dayul Lee on Hashnode."
url: "https://hashnode.com/@dayul"
---

@dayul

# Dayul Lee

@dayul · Seoul, South Korea · Joined May 2026

Management informs. Engineering decides. Code is strategy. Every architecture decision has a reason.

## Comments

[This hit close to home! I’ve been migrating parts of my project to Go lately, and your post is a huge reality check. It’s easy to forget that AI produces valid SQL but ignores production scale and lag—I’m definitely going back to double-check my migration files now lol.](https://hashnode.com/posts/stop-letting-ai-write-your-database-migrations/69fb6cab50ecad45334d12e6/comment/69fde91ff239332df4c8f323)

Comment · Article · May 8 · [Stop Letting AI Write Your Database Migrations](https://hashnode.com/posts/stop-letting-ai-write-your-database-migrations/69fb6cab50ecad45334d12e6)

[Thank you so much! Hope you enjoy it 😊](https://hashnode.com/forums/thread/hii-i-m-dayul/comment/69f646590ab374db992774d6#reply-69fb2c8450ecad45331d2d63)

Reply · Thread · May 6 · [Hii I'm Dayul](https://hashnode.com/forums/thread/hii-i-m-dayul)

[Interesting angle! I'm more focused on the CS/systems side for now though.](https://hashnode.com/forums/thread/hii-i-m-dayul/comment/69f7dd2176c1469ba40258a7#reply-69fb2c0e50ecad45331cc275)

Reply · Thread · May 6 · [Hii I'm Dayul](https://hashnode.com/forums/thread/hii-i-m-dayul)

[Hi Ruva. How are you?](https://hashnode.com/forums/thread/hii-i-m-dayul/comment/69f646590ab374db992774d6#reply-69f6e86d0ab374db99806ac5)

Reply · Thread · May 3 · [Hii I'm Dayul](https://hashnode.com/forums/thread/hii-i-m-dayul)

[Great read! Spreading the load across thousands of machines is exactly what makes companies like Netflix survive traffic spikes. Do you think there's a point where horizontal scaling alone isn't enough?](https://hashnode.com/posts/scalability-is-not-about-your-code-here-s-what-it-really-means/69f594fdec32cba9e5b859ef/comment/69f639790ab374db991e6676)

Comment · Article · May 2 · 1 · [Scalability Is Not About Your Code — Here's What It Really Means](https://hashnode.com/posts/scalability-is-not-about-your-code-here-s-what-it-really-means/69f594fdec32cba9e5b859ef)