About
Technical field notes on digital identity, AI-assisted engineering, and personal knowledge systems.
I’m Dario Castellano — a software engineer working at the intersection of digital identity, applied cryptography, AI-assisted engineering, and personal knowledge systems.
This site is my technical field journal: a place where private research notes, implementation experience, and experiments become public writing.
What I write about
Digital identity: EUDI Wallet, verifiable credentials, OID4VCI, OID4VP, SD-JWT, mdoc, proximity verification, and trust models.
AI engineering: agentic coding workflows, spec-driven development, project memory, and practical ways to use LLMs in software work.
Knowledge management: second-brain systems, PARA, LLM-maintained wikis, durable synthesis, and writing workflows.
Build in public: small tools, experiments, lessons learned, and project notes.
Editorial principle
The goal is not to publish polished thought leadership. The goal is to make technical thinking legible: what I’m learning, what I’m building, and which mental models are becoming useful over time.
Most articles start as notes in my private knowledge base. Before publishing, they are cleaned up, rewritten for a public reader, and stripped of confidential details.
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