Descripción de la oferta
Senior Performance Engineer
We are looking for a Senior Performance Engineer to lead our efforts in making Proton VPN the fastest, most resilient, and most reliable VPN service in the world.
What you will do
Design and own Proton VPN’s performance framework, defining metrics and KPIs that reflect the real-world experience of users (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.
Job requirements
Technical Skills
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.
Soft Skills
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.
What We Offer
Office First: Collaboration is easier and more effective in person, which is why we have offices in Geneva, Zurich, Prague, Barcelona, Paris, London, Vilnius, Skopje, and Taipei. You can also enjoy working from home up to 30% of the time, while enjoying great company during our three core days in the office.
Technology: We provide all the devices and software you need to excel in your role, ensuring you have the best tools at your disposal to achieve your goals.
Food: Lunch and snacks are provided by Proton every day at our offices.
Transport: We will always support our employees with transport costs through subsidizing public transport, bike allowances, or parking spaces based on your office location.
Stock Options: At Proton, we are all owners of the company and you get stock options when you join us.
Flexible Working: You can define your own working hours as long as it works with team meetings.
Learning and Development: We are committed to your professional growth. Proton offers various learning opportunities, including training programs, conferences and 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: Proton is a community-first organization, started with the support of a crowdfunding campaign and built with community input. To this day, Proton’s only source of revenue is user subscriptions. Over 100 million people trust and support Proton, and we put our users and community first in everything we do.
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. 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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