I think you can impress them more when your feat of good programming is also useful to others. "Ive done this trick to make Rust compiler faster", "I've improve

I think you can impress them more when your feat of good programming is also useful to others. "Ive done this trick to make Rust compiler faster", "I've improved a frequently used function in the core libary of C#", "I've made a cross platform gui library that is easy to use and efficient", "I've found a faster way to hash in certain use cases" Telling people about your feat of programming that was very difficult but was a (probably) non-useful learning exercise probably won't be interesting unless they are a friend or also happening to be wanting to learn about the same thing.