engineering log

Engineering Log

Real-world system design notes, hardware protocols, network topologies, and distributed software architecture.

Engineering Articles & Logs

AndroidFintechEMVC#KotlinEmbedded

2026-08-14 · 6 min read

Architecting Sub-50ms Transaction Pipelines for 10,000+ Android POS Terminals

Deep dive into EMV kernel integration, asynchronous binary protocols over cellular networks, and offline SQLite WAL buffer synchronization.

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MikroTikWireGuardNetworkingZeroTierDevOps

2026-06-20 · 5 min read

How to maintain bulletproof remote access to isolated distributed industrial devices behind dynamic IPs and strict mobile carrier NAT barriers.

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PostgreSQLWASMPGliteNode.jsDrizzleORMArchitecture

2026-04-10 · 5 min read

Running real PostgreSQL inside the V8 process via PGlite for ultra-portable, self-contained single-binary microservices without daemon bloat.

Read Deep Dive→Production Case Study