Fourteen SystemsEngineering
Blog
Architecture decisions, security patterns, and lessons from building production SaaS infrastructure.
Your SaaS Has No Memory
Most apps can't answer 'who did that?' Audit logging isn't a compliance checkbox. It's the difference between trust and guessing.
Webhook Idempotency Is Not Optional
Stripe retries webhooks by design. If your handler isn't idempotent, you don't have a billing system — you have a race condition.
Why Most Starter Kits Collapse After Month 6
Starter kits optimize for week one. Production SaaS needs to survive month twelve. Here's where the gap opens and why it matters.
Feature Flags Should Be Compile-Time, Not Hope
Most apps use env booleans for feature flags. Then dead code accumulates, routes leak, and access logic becomes inconsistent. There's a better way.
Preventing IDOR in Next.js Multi-Tenant Applications
A practical pattern for preventing cross-tenant data access in App Router APIs.
Why SaaSCoreX Enforces RBAC Server-Side
Most SaaS starters hide buttons. SaaSCoreX blocks the action. Here's why server-enforced permissions matter and how we implemented typed RBAC with 13 action gates.
Most SaaS Authorization Is UI Theater
Hiding buttons is not authorization. Why scattered conditionals decay, and what server-enforced boundaries actually look like.