This is a very common pattern in high level languages and has been a thing ever since Perl had first come onto the scene. The whole point was that you use more ergonomic, easier to iterate languages like Perl or Python for most of your logic and you drop down into C, C++, Zig, or Rust to write the performance sensitive portions of your code.

When compiled languages became popular again in the 2010s there was a renewed effort into ergonomic compiled languages to buck this trend (Scala, Kotlin, Go, Rust, and Zig all gained their popularity in this timeframe) but there's still a lot of code written with the two language pattern.