Senior Backend Engineer: PHP/Rust for Privacy-First Libraries

Proton is seeking a backend engineer to design and build shared libraries and internal services used across Proton products. You will shape architecture, write clear documentation, and collaborate with product teams to drive adoption in a fast-moving, privacy-focused environment.

You will work on a large-scale PHP backend with Rust components where performance and memory safety are critical, participating in RFCs and cross-team reviews while improving build times and developer experience.