Site Reliability Engineer - Infrastructure Systems

Proton; Paris; On-site; EUR 50,000 - 77,000; Full time

Benefits offered by this job

Stock Options

Technology

Learning & Development

Employee Benefits

In‑Person Collaboration

Food

Transport

Flexible Working

Job summary

Proton is seeking an experienced Infrastructure Systems Engineer to join the global team in Paris. You will maintain base platforms (Kubernetes, VM orchestration, Bare metal provisioning) and critical services (DNS, DHCP, SoT, Monitoring) to ensure reliable operations across our worldwide network.

You'll design HA, scalable architectures, implement automation, and improve monitoring with Prometheus and Grafana, while upholding strong security practices in adversarial environments.

Qualifications

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

Responsibilities

• Oversee and optimize Proton's global network of thousands of servers.
• Design and implement automation systems ensuring 99.95%+ uptime.
• Serve as an active on-call rotation member, troubleshooting across networks and censorship scenarios.
• Develop and enhance monitoring/alerting for real-time visibility across infrastructure.
• Engineer solutions to improve connectivity, stability, performance, and security across environments.

Skills

Linux Expertise

Infrastructure as Code

Programming (Python)

Architecture design

Observability Tools (Prometheus Graf)

Security Knowledge

Tools

Kubernetes

Terraform

Ansible

Puppet

Job description

Join Proton and build a better internet where privacy is the default

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!

Purpose of the role:

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…).

What you will do:

• 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

Job requirements:

• 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

What We Value:

• 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

Bonus points for:

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

What We Offer

• Work that Matters: millions of people trust Proton with their privacy. We answer only to our users — not advertisers, not investors with conflicting agendas, not governments. The work you do here is real, and the impact is measurable. (read more about our impact here)

• Salary Range : Paris - Base Annual Gross - 50,000€ to 77,000€ - Final compensation will be determined based on the candidate’s qualifications, skills, and previous experience.

• Stock Options: at Proton, we all have the opportunity to be owners of the company. From day one, you have a real stake in what we’re building. When Proton wins, you win.

• Technology: you’ll get the right hardware and the right software you need to do your best work.

• Learning & Development: we invest in your growth because sharp people make us better. Proton is one of the fastest ways to accelerate your career because you’ll be thrown into real challenges, with real ownership, from day one.

• Employee Benefits: your wellbeing isn’t an afterthought. We offer strong health coverage, solid retirement options, generous leave, and wellness support so you can bring your best self to work every day

• In‑Person Collaboration: Amazing things happen when passionate, smart, and purposeful people get together in the same room. With offices across Geneva, Zürich, Barcelona, London and more, you’ll spend most of your time collaborating face‑to‑face with people who genuinely care about what they’re building

• Food: Lunch and snacks are on us every day in our offices so you can focus on the work and not on what’s for lunch.

• Transport: getting to the office shouldn’t cost you. We cover public transport, bike allowances, or parking, whichever works for you.

• Flexible Working: you own your schedule. Set hours that work for you and your team — because outcomes matter more than when the clock says you started.

Our Commitment to Diversity and Inclusion

At Proton, we believe diversity drives innovation and strengthens our mission to provide privacy as a default for all. We are committed to fostering an inclusive environment where all individuals, regardless of race, ethnicity, gender, age, sexual orientation, physical ability, or socio‑economic background, feel valued and empowered. We strive to create equal opportunities, promote open dialogue, and support continuous learning to ensure every voice is heard and respected.

If you need any extra support or reasonable adjustments during the hiring process, please let your talent partner know.

Candidate Privacy Notice

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.

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 [e-mail].

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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