Engineering notes — things I keep re-explaining, written down once.
- Capacity Planning Direct Browser Storage: Presigned POST, PUT, or Multipart?
- Error Tracking for SaaS: Grouping, Fingerprints, Stack Traces, Releases, and Environments
- Is SMS OTP Enough for GDPR, PSD2, NIST, and 2FA Login Risk?
- Feature Flags: 404 Missing Keys, Delete/Recreate, and Node.js Fallback Defaults
- Hosted KPI Dashboard Backend API for Next.js Internal Admin Panels
- Private PDF exports in Next.js: signed download URLs from object storage