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.

Nice to Haves

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.

Office First: Collaboration is easier and more effective in person, with offices in multiple locations allowing for a hybrid work environment.
Technology: Provided tools and software to excel in your role.
Food: Daily lunch and snacks provided at the office.
Transport: Support for transport costs through various means based on office location.
Stock Options: Ownership of the company through stock options.
Flexible Working: Define your working hours within team meeting constraints.
Learning and Development: Commitment to professional growth with training programs, conferences, and continual learning opportunities.
Employee Benefits: Comprehensive health insurance, retirement savings options, vacation policies, and wellness programs.
Work that Matters: A community-first organization built on user trust and support, putting users first in everything it does.