Senior Linux Kernel Driver Engineer

This role sits at the boundary between host and silicon. The kernel driver is key to keeping pace with our ultra-fast devices on cutting-edge server platforms. It's a high-leverage layer where each win shows up as real throughput and latency gains.

You'll be there for the pre-silicon simulations, first bring-up, first end-to-end runs, and the moments where performance jumps because of something you shipped. What you'll do

• Design, develop, and maintain the Linux kernel driver for Fractile's AI accelerator
• Build the performance-critical kernel-space paths that keep the host stack moving: PCIe device management, DMA, memory handling, interrupt handling, and robust recovery paths
• Define and evolve the userspace interface the runtime depends on, with a focus on stability, debuggability, and performance
• Work in a tight co-design loop with hardware, firmware, runtime and ML engineers: validate assumptions, iterate on behaviour, and close gaps early
• Improve tooling/workflows so we move fast without breaking things

• You've shipped and maintained Linux kernel device drivers in production. Experience with PCIe-attached devices and custom hardware interfaces is ideal.
• Strong systems and performance instincts. You can reason about computer architecture, concurrency, and where the time goes
• Excellent C and/or Rust, and a pragmatic approach to building high-quality, maintainable & secure kernel code
• You enjoy hard kernel and system-level problems, and you take them end-to-end until the measurements move
• Computer Science, Electronic Engineering, Maths, Physics, or related degree and 3+ years of industry experience

Nice to have

• GPUs / ML accelerators / high-throughput I/O (NICs, RDMA, storage)
• Hardware bring-up or pre-silicon simulation experience
• Performance work: profiling, tracing, benchmarking, regression tracking

At Fractile, we're building what we believe will be the world's fastest AI inference chip from the ground up. We're balanced across hardware and software engineering, and HW/SW co-design is real here. We move fast, and we help each other move fast. We care about each other, the software we ship and the people who rely on it.