Performance Engineer, Kernel and Memory

We're seeking a Performance Engineer, Kernel and Memory to join our team at Cloudflare. You will work on diagnosing and fixing performance and scalability bottlenecks in the Linux kernel memory-management subsystem, informed by real production telemetry at a large scale.

Responsibilities

• Diagnose and fix performance and scalability bottlenecks in the Linux kernel memory-management subsystem.
• Land your work upstream, ensuring MM changes go to mainline first.
• Build and extend low-overhead kernel instrumentation.
• Partner with kernel, networking, storage, and product engineers to turn observed system behavior into concrete MM improvements.
• Set technical direction for how Cloudflare uses, tunes, and evolves kernel memory management.

Requirements

• Deep expertise in the Linux kernel memory-management subsystem.
• A track record of upstream Linux contribution, ideally including maintainership or sustained work in MM or an adjacent subsystem.
• Strong systems programming in C.
• Ability to dive deep into a complex codebase while keeping the fleet-wide picture in mind.
• Clear communication with engineers across many teams.

Bonuses

• Strong understanding of Linux kernel internals pertaining to memory management.
• Experience troubleshooting and resolving performance issues in large-scale distributed systems.
• Experience with large-scale configuration/deployment management.