I am mainly involved in infrastructure construction.
-2008 : Software development (java, python, etc. )
2008-2012 : Network and Storage (design, construction and operation)
2013- : OpenStack (construction, PoC, version up)
2018- : Container , Docker/Kubernetes/Rancher (design, construction),
CI/CD (Gitlab, wercker, drone, etc. )

qiita: https://qiita.com/niiku-y