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Is this what you mean by nlopt? https://github.com/stevengj/nlopt
If so, it looks like you're interfacing from R to high-performing code written in C. Isn't that exactly what OP was describing?
So in other Julia geometry-related projects that may be true, but for this particular corner of the ecosystem the main author (Júlio Hoffimann) has actually implemented much of the underlyin code from scratch (to the best of my understanding) in pure Julia in a whole set of packages, including
https://github.com/JuliaGeometry/Meshes.jl