Tetsuharu Fujiki

Systems generalist — Linux low-level, network defense, Swift/macOS internals (pf, XPC, privileged helpers), ML, high-throughput data. Background: enterprise IT, then gov/research ASP.

The non-code half of shipping solo: notarization pipelines, trust signals, pricing a security product. On the code side — fuzzing Swift, and MCP server internals.

RoamSwitch — a Mac menu-bar app that switches your network security by how much you trust the current Wi-Fi. Plus its read-only MCP server (open source).

Talk to me about macOS security internals (pf, XPC, privileged helpers), MCP servers, or the reality of running an indie security product. RoamSwitch bug reports welcome.