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Dayul Lee

Management informs. Engineering decides. Code is strategy. Every architecture decision has a reason. This blog asks why.

Seoul, Korea Joined on May 1, 2026 dy007lukyday@gmail.com https://lukyday-blog.vercel.app/en

Dayul Lee

May 6

Network Part 5 - CDN, WebSocket, and Idempotency: When the Parts Meet Traffic

#network #cdn #websocket #idempotency

10 min read

Dayul Lee

May 1

Network Part 4 - The Load Balancer as a Traffic Information Decision

#network #dns #l4 #l7

8 min read

Dayul Lee

May 1

Network Part 3 - The Evolution of HTTP and the Cost of Every Trade-off

#largescale #network #backend #http

5 min read

Dayul Lee

May 1

Network Part 2 - The Cost of a TCP Handshake

#largescale #network #backend #tcp

4 min read

Dayul Lee

May 1

Network Part 1 - The OSI Model as a Fault Map

#osi7 #network #backend #systemdesign

4 min read

Dayul Lee

May 1

Prologue - What is Large-scale Processing?

#largescale #network #backend #systemdesign

3 min read

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