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A writeup for solving the five AttackLab phases with buffer overflow, code injection, and ROP(Return-Oriented Programming).

A BombLab writeup for defusing six phases and the secret phase by disassembling and debugging the given binary with GDB.

A note from implementing a gift API in Kakao Tech Campus, where I had to decide whether to rely only on database constraints or check some rules in the application first.

A record of building a medical paper-based answer flow in DocDoc, where RAG, reranking, and SSE streaming were used to reduce unsupported answers from an LLM.

An early project note about fixing a Fragment display issue after returning from the background by looking at savedInstanceState and the Android lifecycle.

An early project note about building a TCP socket server instead of using HTTP polling, so a NodeMCU device and an Android app could exchange state updates in real time.