Blog — John Anthony Pecson
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Engineering notes & essays.

Deep dives on backend engineering, cloud architecture, distributed systems, HealthTech, AI, startups, and the open-source tools I build.

Zero-knowledge architecture cover
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Open Source·14 min read·Mar 2026

Designing a zero-knowledge secret manager

How I architected MeowPass so the server can never read your secrets, Argon2id key derivation, AES-256-GCM, and X25519 key exchange for teams, all without a single plaintext byte leaving the device.

Security MeowPass Cryptography
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