I’m Nicola De Filippo, a systems programmer with 20+ years of experience. I write about Rust and Go, concurrency, internals, performance, low-level mechanics.
notdefine.dev is a play on my name. It fits: most of what I find interesting lives close to undefined behavior.
I’ve worked across the stack, from kernel modules to distributed systems. These days I focus on the parts that matter most: memory, concurrency, and system design.