Fractile is a UK AI hardware startup building next-generation inference chips and systems for frontier AI.
<p><strong>Physical Design Engineer</strong></p> <p><strong>About Fractile</strong></p> <p>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.</p> <p>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.</p> <p> </p> <p>We are seeking a Physical Design Engineer to contribute to our next-generation chip designs. As a Physical Design Engineer, you will support the implementation of complex IC physical designs, from synthesis to sign-off. You will collaborate with cross-functional teams, including logic design, verification, and process technology, to optimise performance, power, and area (PPA) while ensuring design integrity and manufacturability.</p> <p><strong>Key Responsibilities:</strong></p> <ul> <li>Support the physical implementation of ASIC/SoC designs, including floor planning, placement, clock tree synthesis (CTS), routing, and sign-off.</li> <li>Work on synthesis, timing analysis (STA), and optimisation to achieve strong PPA metrics.</li> <li>Assist in power planning and analysis, addressing IR drop, electromigration, and related effects.</li> <li>Ensure design rule check (DRC), layout vs. schematic (LVS), and other physical verification compliance.</li> <li>Collaborate with DFT engineers to integrate design-for-test (DFT) structures into the physical implementation.</li> <li>Develop flows in EDA tools such as Cadence Innovus, Synopsys Fusion Compiler, Mentor Graphics Calibre, and others.</li> <li>Work closely with RTL and architecture teams to support design feasibility, constraints, and physical-aware RTL design.</li> <li>Work with advanced AI tools and models to improve productivity, analysis, and design quality.</li> </ul> <p><strong>Preferred Qualifications:</strong></p> <ul> <li>Bachelor’s or Master’s degree in Electrical Engineering, Computer Engineering, or a related field.</li> <li>2–5 years of experience in physical design for advanced technology nodes (e.g., 7nm, 5nm, or below), including internships.</li> <li>Familiarity with EDA tools for place & route, STA, and sign-off.</li> <li>Basic understanding of CMOS technology, semiconductor physics, and process limitations.</li> <li>Exposure to timing closure, signal integrity, IR drop analysis, and formal verification.</li> <li>Proficiency in scripting languages like TCL, Perl, or Python for automation is a plus.</li> <li>Excellent problem-solving skills, communication, and teamwork in a collaborative design environment.</li> <li>Interest in working with advanced AI tools and models as part of the design workflow.</li> <li>Experience or coursework in high-performance computing (HPC), AI accelerators, or networking chips is a plus</li> </ul> <p><strong><em>What We Offer</em></strong></p> <div class="notion-selectable notion-text-block" data-block-id="33d2905b-d614-80a2-9780-edece30e6788"> <div class="x78zum5"> <div id=":r5:" class="content-editable-leaf-rtl notranslate" data-content-editable-leaf="true"> <ul> <li>Competitive salary: A competitive salary reflective of your experience and the specialist nature of the role.</li> <li>Equity & Ownership: meaningful equity so everyone shares in the value creation.</li> <li>Benefits: Private Medical, Dental and Vision, Contributory Pension, 25 Days holiday plus bank holidays and Life/Critical Illness Insurance.</li> <li>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.</li> </ul> <p>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!</p> <p><strong><em>Export controls</em></strong></p> <p><em>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.</em></p> </div> </div> </div> <p> </p>