Blog
Concrete problems, concrete solutions — from production work, not theory.
How I built German e-invoicing into PEX: KoSIT as the referee, a canonical model of my own, the original as the legal record, a GoBD archive with a hash chain — six decisions for Laravel projects.
Read more
Building a SaaS product alone — API, app, billing, iOS, and marketing site. Five architecture decisions from building PEX that I would make again.
Read more
How do you prevent double bookings when two users book the same room at once? A transaction with an overlap query — and why the answer depends on your database.
Read more
