Senior Backend Engineer (Payments)

Payments Team – Overview
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Proton's Payments team focuses on enabling revenue generation across the ecosystem by integrating new payment methods and building client libraries. The team has a broad impact across all Proton products and works closely with the Account Team, Finance team, and Business Units to align pricing and promotions with user expectations.
Key Responsibilities
Build features in all Proton products.
Collaborate closely with product and engineering teams across the company.
Design scalable software architectures following best practices.
Optimize user experience and design.
Develop and maintain back‑end services in PHP/Symfony and collaborate on front‑end (React), mobile (Kotlin/Swift), and shared Rust code.
Ensure resilience and performance using profiling techni...