Kestutis Patiejunas is a software engineer at Facebook. He works with a team of engineers on Facebook Warm and Hot Storage – in internal replacement for HDFS. Before he worked on Cold Storage – system for long term data archival where he created hard drive based cold storage and newest BluRay super cold storage. Before Facebook he was a software architect at Microsoft for over 15 years . He also spent a year at Amazon as a principal engineer on AWS Glacier.