I'm working as a postdoctoral researcher in theoretical chemistry. I'm co-developing a modern quantum chemistry code written in C++17. Due to the large number of available quantum chemical methods, approximations, analysis and post-processing possibilities and complicated workflows, such programs are insanely complex. On top of that, the ongoing research requires continuous adaption, extension and refactoring of the existing codebase. I don't shy away from using complicated template constructions in order to improve reusability of code. At the same time, it is important for me to keep the code clean and readable.