agile algorithm ansible book career change ci communication configmap course criteria cs database ddd devops docker education facilitation fallow gamification golang growth grpc inotify interview istio jira kanban kotter kubernetes leadership lean less linux mac math measurement microservice microservices monitoring pmo principle process programming project-management prometheus recruitment religion safe satir scrum security service-mesh skaffold speech succession systems-thinking tech-debt testing tmux toc tools training vagrant waterfall wsl