I code and fix production-grade infrastructure, which concretely means optimisation (memory leaks, latency and so on), bugs whether logic or runtime errors, then security verification/hardening
I made a 23k line production triangular arb bot in 2 months, the kucoin data stream is in my pinned repos while the full bot is obviously private.
100% nullpointer-free scripts (probably)
I don't claim stuff without having proof, so take a look at my pinned repos.