Engineering notes — things I keep re-explaining, written down once.
- Transactional Welcome Email API Alternatives: A Developer Comparison Without SMTP Relay
- Password Reset Email API: Custom Domains, DKIM, SPF, and Token Links
- A Practical SMS OTP API Stack for First-Time US/EU SaaS 2FA
- How to choose an SMS API for critical outage alerts, with status polling and retry
- Picking a transactional email API for password reset on a custom domain with DKIM and SPF
- SMS OTP login in a React Native app — backend API, autofill, resend and abuse prevention
- SMS OTP two-factor auth in NestJS: throttling, audit logs, and recovery codes
- Picking a transactional email API for startup onboarding emails in Node.js