What language is SoundCloud written in?

Related questions

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5. What can the Spotify API do?
6. Is there a SoundCloud app for Windows?
7. Why was SoundCloud made?
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Tags

1. #scala
2. #jruby
3. #using
4. #migrated
5. #clojure
6. #years
7. #systems
8. #occasional
9. #rails
10. #platforms
11. #pieces
12. #infrastructure
13. #front
14. #applications
15. #different
16. #mostly
17. #finagle