Senior Backend Engineer (Foundation)

Proton

Location

London; Paris

Posted

1 month ago

Department

CC - Foundation

What they actually want (must-haves)

5+ years building and operating backend systems in production with a focus on modern PHP
Working knowledge of Rust or ability to learn quickly
Genuine taste in API design
Experience with codebase architecture and module boundaries
Experience evolving shared code without breaking dependencies
A security mindset

Nice to have

Domain-Driven Design experience
Background in developer tooling or developer experience teams
Contributions to open source libraries
Experience migrating codebases between architectures or languages
Experience with applied cryptography or end-to-end encrypted systems

What the job really is

As a Senior Backend Engineer at Proton, you will design and build shared libraries and internal services that are used across all Proton products. You will work primarily in PHP and Rust, focusing on creating abstractions, improving developer experience, and ensuring that the codebase remains navigable and efficient. Collaboration with product teams and other developers is key, as you will help integrate libraries and enforce architectural boundaries within a monorepo environment.

Benefits

Strong health coverage
Solid retirement options
Generous leave
Wellness support
Stock options
In-person collaboration opportunities

Things to weigh

The role involves working in a monorepo, which requires careful management of module boundaries and dependencies
The job requires a strong architectural mindset, which may not suit all candidates
The focus on security means that candidates must have a proactive approach to potential misuse of their code

Job score3.6/5

Benefits5/5

Freshness4/5

Career value4/5

Role clarity5/5

Pay transparency0/5

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