One of the projects Im working on and off is a tamper-proof audit log, based on some PoC code I created almost 10 years go; unit and integration testing are good at preventing defects and regressions, but they will not guarantee your software will work. However, with the power of LLMs, one can easily use model checking (in my case with Quint) and/or other formal proof approaches to ensure the software conforms as specified. The result (in my opinion) is an implementation guided by a single human that is actually more trustworthy than manual human-made software using the traditional approach.