Hello, I'm
Wei Tan
🧑💻 Full-stack engineer
🧠 Psychology
📸 Photographer
🎵 Non-professional singer
👨🍳 Private chefCode is cheap, show me the product.
Blog
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A Master's thesis project implementing decentralised document attestation on Ethereum — multiple parties co-sign a file's SHA-256 hash on-chain, proving co-possession without uploading the file or trusting a central notary.

A privacy-first macOS menu bar app that visualises keystrokes and mouse activity across a 30-day window to reveal work rhythm and app-level attention patterns — fully on-device, zero telemetry.

A local-first Slack agent that intercepts @mentions, replies in your voice via Claude Code, and continuously distils your communication patterns and facts into a personal knowledge base — zero message history in the cloud.


