Security Engineer – Embedded Systems & Trust Chain

Fractile; Greater London; Hybrid; GBP 90,000 - 150,000; Full time

Benefits offered by this job

Equity & Ownership

Private Medical

Dental & Vision

Contributory Pension

25 Days holiday

Job summary

Fractile is building the software and system-level security stack for frontier AI hardware. You will work across bare metal, RTOS, and embedded Linux to turn threat models into concrete mechanisms, shaping the security of the control chain from device to rack.

You’ll design secure boot, root of trust, and authenticated interconnects while collaborating with architecture and hardware teams. This is a hands-on role requiring deep expertise in security and systems thinking.

Qualifications

• Strong C and Rust experience in low-level security
• Hands-on with security primitives in software and silicon
• Ability to design secure-by-design solutions across hardware and software

Responsibilities

• Shape the security of the control chain across devices and racks
• Design and implement secure boot and root of trust on controllers
• Secure interconnects with authentication and integrity protections
• Develop cryptographic mechanisms: key hierarchies, provisioning, device identity
• Ensure safe firmware updates with signing, rollback protection, staged rollout
• Harden the host Linux kernel and on-die firmware
• Collaborate with hardware and software teams to drive fixes and threat-model reviews

Skills

C programming

Rust

Security engineering

Threat modelling

Linux and RTOS

Tools

Secure boot

Root of trust

Attestation flows

Job description

Fractile is building the software and system-level security stack for frontier AI hardware. You will work across bare metal, RTOS, and embedded Linux to turn threat models into concrete mechanisms, shaping the security of the control chain from device to rack.

You’ll design secure boot, root of trust, and authenticated interconnects while collaborating with architecture and hardware teams. This is a hands-on role requiring deep expertise in security and systems thinking.