The singe most important feature of Rust is memory safety. Writing code with performance of C++, at a typical development cost, and with guaranteed absence of certain classes of memory safety related vulnerabilities is something that was not possible before.
@matklad is a Rust developer, who specializes in dev tools and IDEs. He spearheaded [IntelliJ Rust](https://intellij-rust.github.io/) and currently leads the development of [rust-analyzer](https://github.com/rust-analyzer/rust-analyzer).