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Engineering6 min
Code documentation — the cornerstone of sustainable software
Teams who treat documentation as a luxury share a trait: they re-learn their own codebase every six months.
Three layers
1) In-code (why was this written), 2) Architectural (how systems talk), 3) Operational (how it runs in prod). Without all three, knowledge leaves with people.
Engineering win: speed
Onboarding time directly reflects your docs quality. Two weeks is healthy. Six weeks is a problem signal.
Organizational win: independence
Well-documented systems reduce vendor lock-in. Projects move between teams; vendors become replaceable; risk drops.
Integrations and support
Without docs, ERP/CRM/payment integrations take weeks. With them, days.