Engineering notes on backend systems, AI, and software craft.https://janpolhidalgo.dev/https://janpolhidalgo.dev/notes/java-spring-boot-again/https://janpolhidalgo.dev/notes/java-spring-boot-again/Went from TypeScript everywhere to full OOP mode. Java is verbose as hell, Spring Boot makes you write a folder structure before you write a feature, and somehow I'm not mad about it.Thu, 12 Mar 2026 00:00:00 GMThttps://janpolhidalgo.dev/notes/layered-project-structure-vs-feature-based/https://janpolhidalgo.dev/notes/layered-project-structure-vs-feature-based/When projects get bigger, folder structure suddenly matters. I've used both the classic layered structure and feature-first. Here's when each one actually makes sense.Thu, 05 Mar 2026 00:00:00 GMThttps://janpolhidalgo.dev/notes/convex-tanstack-experience/https://janpolhidalgo.dev/notes/convex-tanstack-experience/Wanted to learn Convex and TanStack, so I built a simple Lost & Found app. Turns out the 'hard parts' of backend development aren't as hard as they used to be.Tue, 10 Feb 2026 00:00:00 GMThttps://janpolhidalgo.dev/notes/bubble-tea-go-tui-journey/https://janpolhidalgo.dev/notes/bubble-tea-go-tui-journey/As a first-year CS student who spent months in the command line building Java and C++ projects, I thought: what if my portfolio lived there too? So I built it with Bubble Tea and Lipgloss.Tue, 03 Feb 2026 00:00:00 GMT