System Engineer, Cloudflare

• 3+ years of professional experience building, testing, and operating backend or distributed systems in production
• Strong proficiency in at least one systems programming language (e.g., Go, Rust, C/C++) with a track record of writing clean, maintainable code
• 3+ years of practical experience with databases and data-intensive services—for example, PostgreSQL, ClickHouse, or comparable relational or analytical stores
• Experience reasoning about event-driven systems: message delivery, duplicate or late events, state, failure recovery, and safe changes to live consumers or APIs
• Clear written and verbal communication, and an ability to work through technical decisions with product and engineering partners
• Experience using metrics, logs, traces, profiling, and experiments to understand production behavior and validate improvements
• Bring strong opinions, clear judgment, and a willingness to revise your view when data, users, or production reality prove otherwise

Desirable

• Cloudflare One brings together secure access, network connectivity, and data protection
• Our products generate massive amounts of signals about how people and agents access applications, use the network, and handle data—but a security practitioner needs more than isolated events
• They need to understand what happened, whether it is unusual, why it matters, and what to investigate next
• The UEBA (User and Entity Behavior Analytics) team builds the systems behind those answers
• We ingest and evaluate Cloudflare One signals, produce high fidelity user-risk events, maintain risk scores, and make that information available to customer-facing experiences and other Cloudflare services
• Today, we are focused on expanding our behavioral detections and improving the clarity of the resulting investigations and integrations
• As a Systems Engineer, you will build and operate production services in this pipeline
• You might implement a detection for an unusual pattern of DNS activity or data movement, improve how events contribute to a user’s risk score, or make risk-event history easier for customers to investigate
• You will own well-defined projects through design, implementation, testing, rollout, and operational follow-through, working with other engineers, Product, and partner teams across Cloudflare
• Build behavioral detections. Turn product requirements and available telemetry into production-ready detections across signals such as Access, Gateway, DNS, device posture, and data protection. Define the data dependencies, evaluation approach, and how you will assess signal quality before release
• Make risk understandable. Help connect detection output to event history, logs, and customer-facing investigations so practitioners can see what triggered a finding and how a user’s risk changed
• Design & Scale Infrastructure: Architect, deploy, and maintain robust distributed systems, focusing on high availability, low latency, and horizontal scalability
• Collaborate across teams. Collaborate with Product and engineers in Access, Gateway, Analytics and Reporting, Logs, and other data-producing or data-consuming teams to agree on event contracts and deliver end-to-end functionality
• Ensure Reliability. Participate in architecture reviews, capacity planning, and proactive system health monitoring to guarantee maximum uptime and resilience