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I haven't seen anything on chess.com's stack before. For gp, previous hn discussion on lichess and scala 3: https://news.ycombinator.com/item?id=33865932

It was a pithy comment on Lichess's recent post on upgrading to Scala 3.

The listings on https://www.chess.com/jobs provide some hints. Some mentions of PHP and Java for the backend, Kubernetes, Kafka, Redis, MySQL, Mongo, AWS, and GCP, among other things.

So, Web-scale tech? </snark> I bet load is more on the everything but the chess engine itself.

Did someone say resume driven development?

Well there’s the bottleneck in a nut shell. Ditch the PHP. At least consider Play if you can’t ditch the Java (I can’t vouch for it, but theoretically it should help.)

Otherwise they should consider Elixir/Phoenix as it is easily distributable and/or Rust if they need breakneck speed per thread.

No, they don't use Scala.