Your role and responsibilities: The successful candidate will join the Low Temperature Devices team to develop cutting-edge superconducting single-photon detector (SNSPD) components, which are critical to Xanadu's fault-tolerant architecture. In this role, you will help develop our internal PDK, with a focus on complex multiplexed multi-pixel detector arrays. You will also lead mask design for fabrication process optimization, bridging the gap between simulation and experiment by designing advanced test structures and production tape-outs. This position offers unique design experience with state-of-the-art foundry processes through Xanadu's 300mm fabrication partners and rapid 100mm in-house development. Key responsibilities • Capture device layout requirements through close collaboration with the team's low temperature device scientists. • Design and execute GDS mask layouts for test structures and production tape-outs, ensuring high-quality fabrication outputs. • Perform device-level simulations and develop automated pipelines to integrate design environments with simulation tools. • Regularly interact with the Xanadu Fabrication Engineering team to align design strategies with fabrication capabilities and constraints. • Other simulation or computational projects that aligns with the hire's expertise • Drive improvements in key SNSPD performance metrics through layout optimization and innovative design strategies. Required qualifications and experience: • MSc or PhD in Engineering, Science, or related field, with 2+ years of experience in an industrial setting • Expert-level experience with scripted photonic mask design/layout with one or more of the following tools: gdsfactory, ipkiss3, Virtuoso, OptoDesigner, or similar tools. • Expert-level knowledge and experience in performing physical verification with homemade and/or foundry-provided codes, including DRC (design rule check) and LVS (layout versus schematic) to ensure manufacturing compliance and netlist integrity • Expert-level experience with generating layout in the format of GDSII/OAS in MPW and dedicated full mask sets • Experience working in a collaborative team-based development environment, preferably using version control systems such as Git • Experience collaborating with internal teams and external partners across process integration, packaging, and fabrication • Experience using Python for component design, simulation, layout, and data analysis • Ability to work independently and collaboratively in a fast-paced, cross-disciplinary environment • Strong attention to detail and a rigorous, data-driven approach to problem solving • Excellent written and verbal communication skills Preferred qualifications and experience: • Background in developing superconducting single photon detectors, circuits and devices. • Experience designing layouts for superconducting devices (e.g., SNSPDs) and a strong understanding of their operational principles. • Expertise in layout techniques that account for fabrication effects, such as lithographic rounding, OPC/bias correction, and material non-uniformity, to optimize component performance. • Simulation experience for device-level modeling (e.g., COMSOL) This is for a new position. Your base salary will be determined based on your location, experience, and internal benchmarks. You will also be eligible for equity and benefits.