Notes on security, code, and other things I find interesting.

Building a mobile app is getting easier every year. Turning it into a commercial product - especially from Spain, without a formal company - still has expensive, non-obvious walls.

Design-first OpenAPI looked clean until Spring generics, pagination, and response wrappers outgrew what a YAML spec can honestly express. Here is why Mirror moved control back into the code.

I'm a technical founder building a consumer app. Marketing and monetization are harder than any backend I've shipped.

Spring Boot on AWS, MongoDB Atlas, Auth0, Terraform infrastructure, OpenAPI contracts, and the engineering choices behind Mirror's backend.