EJENGINEERING JOURNAL
Notes written to the same standard as the code.
Long-form entries on systems that appear in the evidence — what was decided, what it cost, and what broke along the way. Sources linked throughout.
NO. 0012026-07-02
Lessons from publishing a negative result
Helios-Dx set out to find a quantum advantage for privacy-preserving medical inference. It found none. What closing a study honestly — capacity-matched, seeded, citable — taught me about engineering discipline.
7 MIN#research #integrity
NO. 0022026-07-02
Designing concurrent inventory systems
One invariant — stock is never oversold — defended through idempotency keys, a Redis queue, and a row-locking Postgres transaction. Why the queue exists, why optimistic locking wasn't enough, and what it cost.
9 MIN#backend #concurrency
NO. 0032026-07-02
Hidden-state geometry for LLM security
Text filters read what attackers write. GEOFENCE-LLM reads what the model does: trajectory geometry across layers, windowed features, and a fail-closed authority — plus the honest numbers that keep it a research direction.
8 MIN#llm-security #interpretability