Site Reliability Engineer - Infrastructure Systems

Proton was founded in 2014 by scientists from CERN with the belief that privacy is a fundamental human right. Since then, Proton has built a range of encrypted services used by millions worldwide to protect their data and fight censorship.

You will be part of the Infrastructure Systems team, responsible for the base platforms in Proton (Kubernetes, VM orchestration, Bare metal provisioning) and the critical services that support them (DNS, DHCP, SoT, Monitoring).

• Infrastructure Management
  :
  Oversee and optimize our 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
  :
  In‑depth 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, complex distributed scalable systems architecture.
• Observability Tools
  :
  Hands‑on experience with 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.

• Work that matters: millions of users trust Proton with their privacy. The work you do here has real, measurable impact.
• Salary Range :
  Paris – Base Annual Gross – 50,000€ to 77,000€ (final compensation will be determined based on your qualifications, skills and experience).
• Stock Options
  :
  From day one you have an opportunity to own a stake in the company.
• Technology
  :
  You will receive the hardware and software you need to perform at your best.
• Learning & Development
  :
  We invest in your growth so you can accelerate your career through real challenges and ownership.
• Employee Benefits
  :
  Strong health coverage, solid retirement options, generous leave and wellness support.
• In‑Person Collaboration
  :
  Offices across Geneva, Zürich, Barcelona, London and more, where face‑to‑face collaboration happens.
• Food
  :
  Lunch and snacks are provided daily in our offices.
• Transport
  :
  We cover public transport, bike allowances or parking as needed.
• Flexible Working
  :
  You own your schedule and set hours that work for you and your team.

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.