How Hodori keeps every school's data isolated on one PostgreSQL database: a denormalised organisation id on every table, RLS policies that read the JWT, business logic in SECURITY DEFINER RPCs, and the super-admin trap I had to close.
Lessons from wiring Egyptian Tax Authority e-invoice submissions into a 96-table ERP: model submissions as their own table, treat VAT registration as data not code, and keep the money views honest.
What it took to send event invitations to hundreds of guests on the Meta Cloud API from inside a CRM: a rank-guarded status machine, one worker holding credentials, a drain loop for the messaging tier, and a quality circuit breaker.
How the SCR (Secure Container Release) web platform at T-Mining was restructured into eight independently deployable frontend modules with one shared component library, and what a 60% load-time improvement actually required.