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Solving the five AttackLab phases with buffer overflow, code injection, and ROP(Return-Oriented Programming).

Defusing six BombLab phases and the secret phase by disassembling and debugging the given binary with GDB.

Deciding when a Kakao Tech Campus gift API should rely on database constraints and when it should validate rules in the application layer.

Building a medical paper-based answer flow in DocDoc with RAG, reranking, and SSE streaming to reduce unsupported LLM answers.

Fixing an Android Fragment display issue after background return by tracing savedInstanceState and lifecycle behavior.

Building a TCP socket server for an autonomous IoT lamp so a NodeMCU device and Android app could exchange state updates in real time without HTTP polling.