Senior Backend Engineer (Payments)

Location: Barcelona or London (onsite, in-person collaboration expected)

Company

Proton builds privacy-focused tools including encrypted email (Proton Mail), VPN, Drive, Pass, and Calendar, used by millions worldwide.

What you will do

• Build features across all Proton products integrating payments.
• Collaborate closely with product teams, engineers, finance, and business units.
• Design scalable software architecture using best practices.
• Optimize user experience and performance in payment flows.
• Expand payment methods for global users beyond credit cards and PayPal.

Requirements

• Proven backend development experience
• Expertise in scalable, high-performance solutions
• Proficiency with profiling and performance optimization
• Experience leading team initiatives from discovery to production
• Strong SQL (MySQL preferred) and data modeling
• Familiarity with Redis or caching technologies
• Security best practices and secure software implementation
• In-depth HTTP/REST APIs and cryptographic concepts

Nice to have

• Experience in payments domain

Culture & Benefits

• Work with high-caliber team from top institutions like MIT, CERN.
• Strong health coverage, retirement options, generous leave, wellness support.
• Stock options from day one.
• Office perks: daily lunch/snacks, transport coverage.
• Flexible schedule focused on outcomes.
• Learning & development investment, modern hardware/software.