Reverse engineering the Alienware keyboard's USB protocol to drive custom RGB lighting, decoding the HID reports with Wireshark for full control, with the commands and code included.
Semi-automated reversing with Unicorn: emulate an e-commerce app's native code to recover its sign algorithm without manually tracing every ARM instruction.
Reversing a chat app's Protobuf protocol over Netty, then building a working message client from scratch by reimplementing its AES and RSA encryption layers.
Reversing the Protobuf-based chat protocol of a live-streaming app, decoding the message schemas from bytecode to understand how the chat client talks to the server.