Masahito Muroi is a senior software enginer in LINE. He is in charge of developing LINE's private clouds, which is developed on OpenStack and accomodates over 1,000 HV and 20,000 VMs for production use. He is a member of core developers in OpenStack Blazar project and OpenStack Congress project. He ran Blazar PTL Ocata cycle to Rocky cycle. He is involved in cloud technology area more than 8 years.