What Is Architectural Debt vs Technical Debt

Technical debt is messy code within a module. A function that grew too long. Tests that got skipped. Architectural debt is about the boundaries between modules. A monolith that should be split. Coupling patterns that block independent deployment. Shared databases that prevent team autonomy.

Architectural debt is harder to see because it lives in the shape of the system, not in any single file. The telltale sign: your team knows what to build but can't figure out where to put it without breaking something else.

Architectural Embezzlement is the root cause. Every shortcut that uses a foreign endpoint for convenience today creates architectural debt that must be paid tomorrow.