Blog

Engineering
notes.

Architecture decisions, AI research, and product updates from the Serpaix team.

CategoryOctober 202610 min read

What Is a Personal AI Operating System? A Working Definition

A personal AI operating system is the layer between you and every AI you use: it captures what you see, hear and write, keeps it in a private structure you own, and serves that memory to whatever model you ask. How the category works, how it differs from a note-taking app, and how to evaluate one honestly.

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ArchitectureMay 20262 min read

Building the World Modeling Engine: Probabilistic Forecasting for Personal Knowledge

How we built a causal simulation engine that predicts future knowledge states based on your capture patterns — and why temporal reasoning required an entirely separate service.

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AIApril 20262 min read

Multi-Hop RAG at the Edge: Running 8 Agents Over a Local Knowledge Graph

The architecture behind Serpaix's multi-agent system: how Research, Graph, and Temporal agents collaborate over a shared memory store without hallucinating connections.

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PrivacyMarch 20263 min read

PII Redaction in Rust: Why We Strip Sensitive Data Before It Leaves Your Machine

A deep dive into the Serpaix LTM daemon's PII redaction pipeline — Sørensen–Dice deduplication, regex-based stripping, and why doing this in Rust matters for latency and trust.

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Engineeringnotes.

What Is a Personal AI Operating System? A Working Definition

Building the World Modeling Engine: Probabilistic Forecasting for Personal Knowledge

Multi-Hop RAG at the Edge: Running 8 Agents Over a Local Knowledge Graph

PII Redaction in Rust: Why We Strip Sensitive Data Before It Leaves Your Machine

Engineering
notes.