Technical notes drawn from real projects: frontend, backend, AI, security, SEO, media and mobile apps.
Store a dozen user permissions in one numeric column, check whether an IP address is in an allowed range, and avoid the traps JavaScript sets when you work with bits.
Intermediate
Why a site freezes with too many database connections when you save files under next dev, how to share one copy with a Singleton (TypeScript and PHP), and when not to.
Intermediate
One login token across services written in different languages: what a JWT is, what to check, where to keep it safely, with code run across three languages.
Intermediate