At Proton, privacy is a fundamental human right and the cornerstone of democracy. Since 2014, Proton has provided free and open-source technology to millions worldwide, ensuring access to privacy, security, and freedom online. Our products, including Proton Mail, Proton VPN, Proton Calendar, Proton Drive, and Proton Pass, empower individuals and organizations to control their personal data and defeat censorship. Proton impacts hundreds of millions of lives, supporting secure and private communications in high-risk situations. We value intelligence, learning potential, ambition, and adaptability, hiring less than 1% of candidates. Our structure is flat, empowering flexibility and fast movement.
Tasks
- Design and own Proton VPN’s performance framework, defining metrics and KPIs that reflect real-world user experience (time-to-connect, throughput, latency, stability, reconnection rates, etc.).
- Develop distributed testing systems that simulate real network conditions, including low bandwidth, packet loss, and high-latency scenarios.
- Continuously measure and analyze performance across platforms (desktop, mobile, backend) and regions to identify bottlenecks and regressions.
- Collaborate with backend, R&D, and client teams to optimize protocol handling, connection setup, routing, and encryption performance.
- Create dashboards, reports, and automated alerts to track global performance health.
- Contribute to the design of resilient connectivity strategies that adapt dynamically to variable network conditions.
- Serve as the performance champion within the engineering organization, mentoring others and driving a data-driven performance culture.
Requirements
- 5+ years of experience in performance engineering or systems QA, ideally in networking, VPNs, or distributed systems.
- Knowledge of network protocols (TCP/IP, UDP, TLS, WireGuard), debugging, manipulating, and performance profiling tools.
- Proven ability to analyze latency, throughput, and stability metrics across multiple layers (client, OS, transport, application).
- Proficiency in Python (or similar scripting language).
- Familiarity with network emulation and simulation tools (e.g., tc/netem, iperf, IPTables/nfTables).
- Experience with monitoring and observability stacks (Grafana, Prometheus, Loki) and CI/CD pipelines.
- Cross-platform experience with Linux, macOS, Windows, Android, and iOS preferred.
- Bonus points for experience with Rust/C/C++/System development.
- Analytical and methodical, yet creative in solving complex performance problems.
- Comfortable working with uncertainty and non-deterministic conditions.
- Collaborative mindset, able to work across client, infrastructure, and data teams.
- Strong communication and documentation skills in English.
Benefits
- Office First: Offices in Geneva, Zurich, Prague, Barcelona, Paris, London, Vilnius, Skopje, and Taipei, with up to 30% work-from-home flexibility and three core days in the office.
- Technology: Devices and software provided to excel in your role.
- Food: Lunch and snacks provided daily at offices.
- Transport: Support for transport costs through subsidized public transport, bike allowances, or parking spaces based on office location.
- Stock Options: All employees receive stock options upon joining.
- Flexible Working: Define your own working hours as long as it works with team meetings.
- Learning and Development: Various learning opportunities, including training programs, conferences, events, and continual learning.
- Employee Benefits: Comprehensive health insurance plans, competitive retirement savings options, generous vacation and leave policies, and wellness programs.
- Work that Matters: Community-first organization, built with community input and funded by user subscriptions.
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Über uns
Das Team
The Proton VPN team enables millions to connect securely and privately, even in restricted or unreliable internet environments. The team collaborates across backend, R&D, and client teams to deliver flawless service under highly variable, real-world conditions.