* Deep systems programming (this one is losing its "hard" luster a bit with Rust, which I'm okay with) * Compilers/DSLs/language runtimes/static analysis * Di

* Deep systems programming (this one is losing its "hard" luster a bit with Rust, which I'm okay with) * Compilers/DSLs/language runtimes/static analysis * Distributed systems (on my list of things to learn, know basically nothing) * More generically: high-performance code, doesn't have to be fintech-fast, but designing and maintaining code that makes excellent use of hardware resources