Senior Systems Software Engineer

London or Bristol, 3 days in the office, 2 days WFH

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 how we work. 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.

We build the control chain that powers on, monitors, updates, and protects devices and racks across bare metal, RTOS, and embedded Linux. It’s production-critical software that keeps racks stable, updates safe, and hardware secure. It’s a critical layer in turning a tokens per second benchmark into a tokens per month system, turning great silicon into reliable output at rack scale.

You’ll be there for the first racks coming to life and rollout days where update safety matters. Your work makes the difference between a bad failure and a clean recovery path. This is the work that makes the system something operators can trust.

What You’ll Do

• Develop firmware and services for management controllers at every level: rack management, BMC, and board/device controllers (RTOS and bare metal)
• Build systems software for board and rack management, from early bring-up through to production deployment
• Implement the critical flows that keep fleets healthy: power-on and provisioning, monitoring/telemetry, updates, recovery, and security
• Integrate with the wider host/device stack (drivers and runtime libraries) so the system works end-to-end
• Work closely with hardware and device software teams to define reliable interfaces, validate behaviour, and debug boundary issues