I'm a theoretical physicist. I really like to code and come up with (efficient) solutions to math and physics problems. I do not particularly care if this is in sub-field A or B. Afterall, the programming part of the job became my passion, yet I still like the relation to the science field.
How should I market myself in applications for PostDoc positions? What you usually find as advice is to say "I'm particularly intersted in your group because you study X with focus on Y and recent paper Z was highly interesting". However, saying (oversimplified) "I really like to code and your advertised positions matches that. Also I like the location of your university." does not seem like the most captivating way of selling myself. Any advice?

Edit: I'd like to clarify that I'm am interested in physics. I find myself often going down the rabbithole to truly understand how and why certain things work and how I could improve/develop it further. But again, this is universal and I don't fancy a particular area. I like field X in physics but in the, I'll probably be fine with any subfield.