~ thomashaffenreffer.com
[ | ]

Thomas
Haffenreffer

ai infrastructure / verifiable systems
cambridge / massachusetts

/01 now

I'm a cloud engineer now building AI infrastructure. I build software to augment thinking, not replace it.

My goal: software that structurally cannot betray its users, using verifiable crypto or AI tools.

Check my projects below for my take on individual-first tech.

/02 projects

zero-to-hero

public

Self-built LLM curriculum from gradient descent to a working transformer. One level per directory, each level shipping its own benchmark and plot.

python · pytorch · numpy

~ github.com/Squamis/zero-to-hero

obsidian-ai-workflow

public

A second-brain stack pairing GTD task management with a Zettelkasten knowledge base, driven end-to-end through Claude Code. Demo vault you can clone and run.

obsidian · claude-code · zettelkasten

~ github.com/Squamis/obsidian-ai-workflow

rust_bitcoin_wallet

public

A Bitcoin wallet implemented in Rust. Self-custody primitives, key management, transaction construction. Built to learn the protocol from the inside out.

rust · bitcoin · cryptography

~ github.com/Squamis/rust_bitcoin_wallet

rust_blockchain

public

A blockchain protocol implementation in Rust. Block structure, consensus primitives, networking. Built from scratch to understand the verifiability story.

rust · blockchain · distributed-systems

~ github.com/Squamis/rust_blockchain

~ more at github.com/Squamis

/03 talks

building a personal ai os in obsidian

podcast

Conversation on building a second-brain in Obsidian, why provider lock-in should scare you, and what local-first AI infrastructure looks like in practice.

obsidian · ai-tools · local-first

~ youtu.be/stuSH-O7puI
/04 links