$fractile$

fractile - Senior Embedded Performance Engineer

London - JJ Mack+ Equity2d ago

In Office Senior EMEA Embedded Systems Engineer Assembly

Requirements

• 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 • Experience with GPUs or dedicated ML accelerators • Experience with simulators (functional or performance) and writing validation or benchmarking workloads • Familiarity with modern ML inference workloads • If you want to build the software that turns cutting-edge hardware capability into real throughput and low latency, come build it with us.

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.

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. • Diverse & fun office: we believe the hardest problems get solved by the broadest range of minds. We are committed to Equal Employment Opportunity through attracting and retaining a diverse team and building an inclusive environment. • Fractile is seeking to increase the clock speed of global progress, one chip at a time. We’ve recently raised $220M from investors including Founders Fund and Accel and our most important work lies ahead. Join us! • Export controls • Our work involves technologies subject to UK, US and other international export control regulations. Certain roles may require additional eligibility checks to ensure compliance with applicable law. We'll be transparent about this throughout the hiring process.