When I worked at Yahoo in an operations role ("production engineering", Yahoo's equivalent of Google's SRE), my team did something similar, we used OCaml in combination with Perl for one task: developing an a mini-language language for describing large clusters of machines (ranges of machines, querying and describing metadata such memberships of machine in a cluster, designating special nodes, descriptions of clusters). Although we ended up switching to C and lex/yacc for this mini-language (due to compiler issues after the switch to 64-bit OS, no idea if these compiler issues were fixed) it was a great experience.

I've since moved on to a software engineering role, but there's something to be said about the freedom (e.g., picking your tools) that exists when you're writing software that only you are responsible for.