Bitcask is a high-performance, especially for HDDs, append-only key-value storage engine that uses an in-memory index for fast reads and sequential disk writes for efficient data persistence.

A header-injection bug in GitHub's internal plumbing turned a routine git push into arbitrary code execution on GitHub's backend - affecting both GitHub.com and on-premise Enterprise Server.

High level architecture of a Mach-O binary. Learned through implementing application support parsing iOS binary.