Python is the most used language by production engineers [0], and the second most used by Facebook infrastructure teams. We use it in domains such as infrastructure management (network/server provisioning, service turnup, auto-remediation [1] of server and services failures), platform services (package deployment, job scheduling, TFTP [2] and kernel upgrades), service configuration management [3] or operational tooling.
Production engineers working on those services will be attending Europython 16 and happy to answer your questions on how Python helps us build service quickly and enables us to move fast and scale.
[0] https://code.facebook.com/posts/1040181199381023/python-in-production-engineering/
[1] https://www.facebook.com/notes/facebook-engineering/making-facebook-self-healing/10150275248698920/
[2] https://ep2016.europython.eu/conference/talks/fbtftp-facebooks-python3-framework-for-tftp-servers
[3] https://us.pycon.org/2016/schedule/presentation/2059/