I do research in the field of system security, with a focus on microarchitectural side channel attacks. This includes the development of new attack techniques, but even more the creation of new tools to process sensitive information securely on otherwise insecure microarchitectures.
For measurements and attacks, I sometimes use low-level programming languages like C, but I also love to do things directly in (x86) assembly. For everything else, I prefer C#.
If I don't do research, I preferably mess around with ASP.NET Core.