Designing a Nest.js-based fallback server while removing a legacy ad server. Why a horizontal layered architecture fit better than Nest.js’s default vertical module slicing for a single API with complex business logic.
How I reduced network costs and enabled instance downscaling by switching from full cache refresh to incremental refresh for campaign configuration data.
A retrospective on moving ad budget pacing from a fixed-rule scheme to a two-layer control loop — per-campaign learning sets the baseline, real-time correction absorbs drift.
A record of implementing the multithreaded HTTP server from Rust Book Chapter 20, experiencing how ownership and concurrency safety are enforced at the type level.
SwapDo, a deepfake-based face synthesis meme service. A record of five months as a developer and team lead in a startup team.
A startup born from a casual League of Legends habit. From architecture design to desktop apps, a record of two people building a service that grew to 10,000 users over five months.
Entering the GDG Korea Android 11 Hackathon solo, building both server and app in three weeks.
Korea Railroad Industry Information Center’s public-data hackathon. A three-person team built an Android app that surfaces hidden rest spaces inside subway stations, over three weeks.