May 15, 2026 — 16 min — Systems Notes
Modular Monolith vs Microservices: A Decision Memo for Real Products
Why teams get stuck between tangled monoliths and premature microservices, and how to choose the next boundary with delivery metrics, ownership, and blast radius.
Reader outcome: Reader can write a decision memo that chooses modular monolith, service extraction, or boundary repair based on team ownership, delivery metrics, scaling pressure, and observable blast radius.