“All submissions will be evaluated by running the program on a Hetzner Cloud CCX33 instance (8 dedicated vCPU, 32 GB RAM).”
Read a billion rows of weather data and print min, mean and max per station. Java only, no external dependencies, all of January. The prize is a spot on a scoreboard and a rumored t-shirt, so the community does the JVM’s performance marketing for free. Every enterprise shop that blames Java for its slow batch job is about to run out of excuses.