For last years I performing development of home automation solutions. Primary they based on ESP8266 connected by Wi-Fi and VPN networks across multiple locations. I'm using native C/C++ code in combination with AJAX frontend for direct control of 'things' and OpenHAB for centralized management.
My primary job is to support strong enterprise solutions:
HPC cluster hardware and software management (Torque, Moab Workflow Management Suite, HP Insight Cluster Management Utility, RedHat Linux, Zabbix)
EMC, NetApp, PanaSAS storage management and SAN design.
Network infrastructure design and management.
VMWare vSphere clusters support.