Sandia National Labs is looking for a TCAD software engineer who is a US citizen and is able to get a security clearance. From their description:
We have an immediate technical staff opening for a semiconductor device modeling software developer with expertise in scientific programming for high performance computing. The position emphasizes algorithm design and enhancement to extend the capabilities and increase the efficiency of our large scale, parallel, drift-diffusion solver, which is a C++/object oriented program. The successful candidate will be part of a team of computational scientists and semiconductor device physicists. Additionally, the position requires extensive interaction with experimental and theoretical physicists and research engineers working on characterizing radiation effects in microelectronic devices and the resulting changes to circuit performance.
I was aware that they had a software named Charon, which leveraged a commercial tool. It looks like they may be developing their own replacement. A quick google search revealed a mailing list for their git archives of the tool. It appears the tool has been in development at least since January 2012.