The article isn’t really very persuasive about this though. Having worked with OCaml at Jane Street is not, I think most of us would agree, going to be, going to be a serious barrier to getting hired to work with another language somewhere else.

> For Jane Street’s technical rank-and-file, particularly the many hired straight out of university, non-compete agreements may be surplus to requirements. A scan of jobs listed by Millennium, a rival fund that has recently clashed with Jane Street in court, shows the strength of the latter’s position in the job market. Millennium wants engineers experienced in c++, Go, Java and Python, languages that are commonly used across finance and tech. OCaml developers, it seems, are Jane Street’s to keep.

If someone worked with OCaml at Jane Street I would just take this as a signal that they are smart enough to quickly learn Go, Python, whatever they need, and will probably be more successful after 6 months than a “Python developer” would be.