Site Reliability Engineer

Proton was founded in 2014 by scientists from CERN on a simple truth: privacy is a fundamental human right. Since then, we’ve built the world’s largest encrypted email service (Proton Mail) and expanded into Proton VPN, Proton Drive, Proton Pass, and Proton Calendar—tools used by millions globally to protect their freedom, fight censorship, and keep their data safe. In some situations, Proton has literally helped save lives!

We are profitable, independent (no VC control), and selectively hire from the top ~1% of applicants. Our 500+ team members across 50+ countries come from leading organizations and elite academic backgrounds. We move fast, keep hierarchy light, and prioritize impact over optics. If you want to do meaningful work with exceptionally high-caliber people, this is it. Join us and do work you can truly be proud of. Check our open-source projects here!

You will be part of the Infrastructure Systems team which provides all base platforms in Proton (Kubernetes, VM orchestration, Bare metal provisioning) as well as all the critical services for them (DNS, DHCP, SoT, Monitoring...).

• →Infrastructure Management: Oversee and optimize our rapidly expanding global network of thousands of servers
• →Automation & Reliability: Design and implement automation systems that ensure 99.95%+ uptime across our infrastructure
• →Problem Solving: Serve as an active member of the on-call rotation, troubleshooting complex technical challenges across different network environments and censorship scenarios
• →Monitoring Excellence: Develop and enhance sophisticated monitoring and alerting systems that provide real-time visibility into our global infrastructure
• →Technical Implementation: Engineer solutions to improve connectivity, stability, performance, scalability, security, and resilience—particularly in adversarial network environments

• Linux Expertise: Knowledge of Linux operating system internals, networking stack, and kernel tuning
• Infrastructure as Code: Strong Experience with Kubernetes orchestration and automation using Terraform, Ansible, Puppet or similar tools
• Programming Skills: Python proficiency for developing automation tools and operational scripts
• Architecture: Ability to design Highly Available and complex distributed scalable systems architecture
• Observability Tools: Hands-on experience with monitoring solutions like Prometheus and Grafana dashboards
• Security Knowledge: Understanding of security principles and best practices for infrastructure

• Adaptability and willingness to learn new technologies as our infrastructure evolves
• Strong problem-solving abilities, especially in high-pressure situations
• Collaborative mindset for working with the whole Infrastructure department

• Experience with bare metal provisioning
• On-premise cloud solutions experience
• Contribution to open-source projects

When you apply for a position, refer a candidate, or are considered for a role at Proton Technologies AG (Proton, we, us, or our), your information is stored in Greenhouse, in accordance with their Service Privacy Policy. This information is used to evaluate your suitability for the posted position. We also retain this information for consideration for future roles that you may apply for or that we believe may align with your background and skills.

If we no longer have a legitimate business need to process your information, we will either delete or anonymize it. Should you have any inquiries about how we use or manage your information, or if you wish to access, correct, or delete your data, please contact our privacy team at careers@proton.ch.

Proton does not accept unsolicited resumes from any sources other than directly from candidates. We will not pay a fee for any placement resulting from an unsolicited offer, even if the candidate is subsequently hired by Proton.

To learn more about our privacy policy, please visit our privacy policy page.

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