Need help in designing a ServiceStack backend and recommendations on client technology

Only respond if you have deployed with ServiceStack backend ** New to the web programming but a seasoned developer highly version in SQL and object pascal, basically a desktop developer moving to the web. I want to standardize on ServiceStack for backend but need to choose a migration path for previous desktop projects I have. I acquired licenses for a number of client technologies (KendoUI, Infragistics, DevExpress,Syncfusion). I need someone skilled in multi tenant setups and integrations that I can plan project direction and review coding decisions.