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.
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.