Semiconductor Product Engineer

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.

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 reinvent 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.

Summary

We are seeking an experienced Semiconductor Test and Product Engineer to be involved in the development, deployment and support of outsourced manufacturing test solutions for next-generation AI accelerator devices. This role spans the full silicon lifecycle from pre-silicon planning and preparation, through first silicon bring-up and NPI to high-volume production. Responsibilities include defining test strategies, developing ATE test content, debugging complex silicon issues, and optimizing yield, coverage, and test cost. They will work closely with the UK-based test development and DFT teams to ensure robust, scalable production of high-performance compute silicon.

Key Responsibilities

• Develop, deploy and maintain ATE test programs for high-volume manufacturing of AI accelerator chips and pre-silicon test vehicles

• Implement manufacturing test content for advanced CMOS designs including high-speed logic, SRAM, DRAM, and high speed IO blocks.

• Develop and debug structural and functional test content such as scan/ATPG, LBIST, MBIST, JTAG, and HSIO tests.

• Bring up first silicon on ATE, including pattern debug, tester correlation, characterisation, and corner analysis.

• Optimize test coverage, test time, and cost while maintaining manufacturing robustness.

• Collaborate with subcontracted test program development partners.

• Collaborate with OSATs and external partners on test program execution and debug.

• Support qualification, reliability testing, and high-volume manufacturing ramp.

Required Qualifications

• BS or MS in Electronics and Electrical Engineering or related field.

• 5+ years of hands-on semiconductor test engineering experience.

• Strong experience developing ATE test programs (Advantest 93K, or similar).

• Solid understanding of DFT methodologies (scan, ATPG, MBIST) and memory test techniques.

• Experience debugging silicon issues at the tester and correlating failures to design or process causes.

• Familiarity with advanced CMOS nodes and production test challenges.

• Ability to work effectively in a cross-functional engineering environment.

Preferred Qualifications

• Experience testing AI accelerators, GPUs, networking ASICs, or other high-performance compute ICs.

• Experience with PCIe Gen5/Gen6 or other high-speed interfaces.

• Exposure to advanced packaging, chiplets, or multi-die test flows.

• Experience improving yield, reducing test time, or optimizing cost in high-volume manufacturing.

• Experience in test hardware procurement (probe cards, load boards, sockets).

You will help Fractile bring its memory technology into production, establishing effective test coverage, resolving manufacturing issues and ensuring we deliver the performance, quality and scale our compute platform needs.

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

• 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.

• 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.