How I ended up
doing both.
I came into security through tooling, not bug-hunting. The first thing I built that felt right was a small CLI that ran ten reconnaissance steps in one command and dumped a JSONL trace — same reflex I now apply to agent evaluations. The output isn't a verdict, it's evidence the next person can re-run, argue with, and disprove.
The endurance side started in parallel. Long sessions made the same point the engineering already wanted: a 90-minute run that's well paced gets you further than a 60-minute hero run that flames out. A guard layer that's auditable is more useful than a black-box filter with a higher single-metric score. Different vocabulary, same shape.
Most of what's on this site I work on solo. One artifact a quarter — case study, open-source release, or a race — and over time it adds up. Nothing dramatic about it.