https://careers.microsoft.com/professionals/us/en/job/1467261/Senior-Software-Engineer-multiple-roles https://careers.microsoft.com/professionals/us/en/job/1467

https://careers.microsoft.com/professionals/us/en/job/1467261/Senior-Software-Engineer-multiple-roles https://careers.microsoft.com/professionals/us/en/job/146726...: “R9 (part of the Teams Core Services) R9 - is a .NET SDK designed to provide a strong foundation upon which high-performance and high-availability services can be built. R9 strives to insulate services from the nitty-gritty details of the platform they are executing on and includes a growing set of utility features which have proven valuable to service developers. We believe R9 will shorten your development cycles by freeing engineers to work on features rather than reinventing infrastructure building blocks. R9 will save you some dough by providing best-in-class implementations for your infrastructure needs, such as logging, metering, redaction, caching, and much more. R9 aims to converge on an essential set of technologies delivered as a modern infrastructure SDK for all Microsoft services. We also want to take this opportunity to align our technology stack with where the industry is headed.” It also could just be shorthand for “Release 9”, as they did in 2012 for Microsoft Dynamics CRM (https://www.zdnet.com/article/whats-on-tap-for-microsofts-dynamics-crm-r9-update-later-this-year/ https://www.zdnet.com/article/whats-on-tap-for-microsofts-dy...)