Engineering notes

Short notes on systems that have to survive real operations.

Practical thinking about authority, data integrity, workflow, recovery, ERP, healthcare, and the trade-offs behind enterprise software.

Event-Driven Architecture: A Practical Guide

Commands, events, idempotency, projections, and the authority boundaries that keep event-driven systems understandable.

Data boundaries, least privilege, auditability, shared-device behavior, and why technical controls alone do not establish compliance.

Inventory state, reversals, reconciliation, and why an apparently successful screen update may still represent incomplete business work.