Are there really programming jobs where you only use one language? I'd prefer to work with people who use the right tool for the job. I work with C/Java/Perl on

Are there really programming jobs where you only use one language? I'd prefer to work with people who use the right tool for the job. I work with C/Java/Perl on a daily basis and occasionally modify Ruby or Python. I've also used quite a lot of C# in the past. In general, I have no language preferences. It's just C# for Windows front-ends, Java for management layer, Perl for configuration, C for core software.