CHANGTECH Consultants was founded in 2010. We provide consulting services on system architecture, deployment engineering and operational support. We provision Red Hat Enterprise Linux on very large scales with Red Hat Network Satellite Server. We incoporate Red Hat Directory Server into the domain to provide Single-Sign-On (SSO) enterprise-wide. We deploy Red Hat Cluster Suite to support distributed storage & high-performance computing (HPC). An essential part of HPC is high-speed interconnects. We have experiences in deploying 10GbE & InfiniBand. In the cloud computing arena, we specialise in Amazon-compatible private/hybrid cloud deployment. We also resell cloud applications such as Google Apps, SugarCRM, Zimbra and a number of Atalassian products, e.g. JIRA, Confluence, FishEye.