Backend Engineer (VPN)

About the role

Join Proton’s VPN team to help build the most trustworthy VPN service worldwide. You will work on resilient, massively‑scalable back‑end solutions that protect millions of users’ privacy.

Key responsibilities

• Collaborate with back‑end engineers and architects to design and implement highly available services.
• Work with client‑app developers and product managers to meet business and reliability goals.
• Document back‑end capabilities for correct client integration.
• Debug and repair critical systems, such as file‑revision cleanup and quota restoration.

Required profile

• Proven experience with PHP entry‑points in a back‑end stack.
• Demonstrated ability to build scalable solutions and lead initiatives from discovery to production.
• Solid understanding of SQL (MySQL preferred), data modelling, and caching technologies like Redis.
• Knowledge of security best practices, HTTP/REST APIs, and basic cryptography concepts.

Required skills

• PHP
• MySQL
• Redis
• HTTP/REST
• Security best practices
• Cryptography fundamentals

What we offer

• Impactful work protecting the privacy of millions of users.
• Stock options giving you ownership from day one.
• Top‑tier hardware and software tools.
• Learning & development programs and fast career acceleration.
• Comprehensive health coverage, retirement plans, generous leave, and wellness support.
• Free lunch, snacks, and covered transport costs.
• Flexible working hours focused on outcomes.