My company (a hedge fund) has been using Julia for our major data/numeric pipelines for 4 years. It's been great. Very easy to translate math/algorithms into code, lots of syntactical niceties, parallelism/concurrency is easy, macros for the very rare cases you need them. It's easy to get high performance and possible to get extremely high performance.

It does have some well-known issues (like slow startup/compilation time) but if you're using it for long-running data pipelines it's great.