# bitwarden Core The bitwarden Core project contains the APIs, database, and other infrastructure items needed for the "backend" of all other bitwarden projects. The core infrastructure is written in C# using .NET with ASP.NET Core. The database is SQL Server. # Contribute Code contributions are welcome! Visual Studio or VS Code is required to work on this project. Please commit any pull requests against the `master` branch. Security audits and feedback are welcome. Please open an issue or email us privately if the report is sensitive in nature.