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Senior Embedded Performance Engineer

Fractile· Device Software
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Hybrid (London / Bristol)Full-timePosted 3mo ago

About the role

Senior embedded software role focused on writing and optimizing low-level ML kernels and the runtime that coordinates hardware accelerators, close to the silicon to influence performance, architecture feedback, and hardware/software roadmaps.

Responsibilities

  • Write and optimise performance-critical ML kernels in C, with assembly where it matters (RISC-V and our own ISA)
  • Build the low-level control paths that feed those kernels, including scheduling, synchronisation, and data movement
  • Write targeted validation workloads and microbenchmarks to keep simulation and hardware behaviour aligned and performance measurable.
  • Profile, benchmark, and track regressions so performance improvements are real and repeatable
  • Work closely with simulation, hardware, ML, compiler, firmware, and runtime engineers in a tight loop, turning profiling data into architecture feedback and real performance wins.

Qualifications

  • Proven deeply embedded software experience
  • Strong performance instincts. You can reason about low-level architecture, memory behaviour, and where the cycles are spent
  • Excellent C, and a pragmatic approach to building high-quality, maintainable low-level code
  • Comfortable writing and debugging optimised assembly (RISC-V ideal)
  • Collaborative and high-ownership. You communicate clearly, move fast, and enjoy working through hard problems with others
  • Computer Science, Electronic Engineering, Maths, Physics, or related degree and 3+ years of industry experience

Skills

Required:Cassemblylow-level performance optimizationkernel/dl runtime development

Benefits

  • Competitive salary: A competitive salary reflective of your experience and the specialist nature of the role.
  • Equity & Ownership: meaningful equity so everyone shares in the value creation
  • Benefits: Private Medical, Dental and Vision, Contributory Pension, 25 Days holiday plus bank holidays and Life/Critical Illness Insurance.
Last updated Sep 10, 2026. Interested? Apply on the company site.
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About Fractile

Radically Accelerate Frontier Model Inference

Fractile is designing AI compute systems that will enable the next generation of AI scaling: frontier model inference, 25x faster, at 1/10th the cost.

frontier model inferenceAI computecompute systemsAI scalinginference hardwareprocessor innovation
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