About Fractile

Fractile was founded in 2022 on the bet that, eventually, the world’s most capable AI systems would be limited in their impact by the time taken to produce useful outputs. We bet everything on the logical conclusion: that the only way to truly unlock this latent value, to make speed viable at scale, was to radically re-invent the hardware that we run our frontier AI models on. Ever since, we have been building chips and systems that tackle this problem: how to efficiently generate output at thousands of tokens per second, while handling the complexity and capacity challenges of operating large models at very long contexts.

The workloads that push to the limits of the current frontier are already transformational; it is the technical and economic limits on inference speed that are constraining progress. The defining work of the 21st century will be marked by the engine of inference delivering immense and diffuse chains of intellectual inquiry, in drug discovery, in software engineering, in materials discovery, in any field where progress is driven by deep reasoning and intelligence to resolve complex problems. 

Key Responsibilities 

• Develop and maintain board/PCBA manufacturing test content for complex, high-power, high-speed boards.
• Implement and debug test coverage across ICT, boundary scan/JTAG, and functional test stages.
• Design and support board-level functional test solutions, including fixtures, probes, cabling, and instrumentation.
• Develop and maintain MCU-based board test firmware for manufacturing diagnostics, self-test, and telemetry validation.
• Implement tests for detecting assembly defects, component failures, solder issues, and manufacturing marginalities.
• Develop PCIe-focused board-level tests to verify chip-to-chip connectivity and integrity.
• Support bring-up and debug of board test stations at offshore EMS/CM sites.
• Analyze test failures and yield data to identify root causes and recommend corrective actions.
• Work closely with hardware, firmware, and SI/PI teams to close board-level testability gaps.
• Contribute to test documentation including test specifications, debug procedures, and manufacturing release notes.
• Support fixture qualification, tester correlation, and ongoing test maintenance.

Required Qualifications

• 4–7 years of experience in board or PCBA test engineering in a high-volume manufacturing environment.
• Hands-on experience with functional test development, ICT, and boundary scan/JTAG.
• Experience designing or supporting test fixtures and automated test stations.
• Working knowledge of high-speed digital interfaces and board-level failure modes.
• Experience developing or supporting embedded test firmware on MCUs.
• Strong debug skills spanning digital logic, power delivery, and interconnect issues.
• Ability to work effectively with offshore manufacturing partners.

Preferred Qualifications

• Experience testing boards with AI accelerators, GPUs, networking ASICs, or similar high-power devices.
• Familiarity with high-current VRMs, multiphase power converters, and power integrity testing.
• Exposure to PCIe Gen5/Gen6 or other high-speed serial links in a production test environment.
• Experience using factory data systems and yield analysis to improve test coverage and throughput.
• Experience supporting board test during NPI, ramp, and sustained production.

How we work

• Ownership and execution: you will have full agency to drive your work forward
• Rapid iteration: we all work directly with top leadership to move from idea to hardware on ambitious timelines
• Full-stack engagement: hardware, software, silicon, and modelling teams all work closely together to create a product with generational impact
• Optimistic and pragmatic: we possess the will to win, and to do the hard work to get us there
• Team player mentality: the mission is bigger than any of us, and we have the curiosity and technical focus to see the best idea shipped, no matter who’s it is

What We Offer

• 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.