Senior Backend Engineer - Platform (Inbox)
$54,000–$83,000 year
On-siteParis, Île-de-France, France
Job Summary
Architect and develop core, cross-product systems shared by Proton Mail and Calendar, prioritizing scale and cost-efficiency. Improve the performance of existing systems using monitoring and metrics to identify where time and infrastructure spend are going, driving cost-reduction initiatives from proposal to production. Apply a data-driven approach to technical decisions and delivery planning, shaping how the team measures and prioritizes work. Collaborate with backend and client engineers to implement comprehensive testing strategies, including unit and integration tests, ensuring the reliability of core systems. Work closely with the product team to design new systems, such as client app update mechanisms, while maintaining quality and performance as first-class concerns.
Required Qualifications
- Strong experience in backend development
- Track record of designing, building and scaling systems that serve a large user base (100M+)
- Demonstrated ability to improve the performance and cost-efficiency of systems already in production
- Hands-on experience with monitoring and observability tooling
- Data-driven approach to technical decisions and delivery planning
- Solid understanding of SQL
- Experience leading a technical initiative end-to-end, from design through production
Desired Qualifications
- Experience with client-server sync or push-notification systems
- Experience with Kubernetes or other containerization technologies
- Experience with PHP/Symfony, Rust, or Python
- Full-stack experience, comfortable working across the frontend as well as the backend
- MySQL preferred
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