Photonics Fabrication and Design Engineer

ABOUT US Great Sky is a technology startup based with a mission to rebuild AI from first principles. We are pursuing neuroscience-inspired hardware and algorithms that overcome the greatest challenges in scaling AI systems. JOB OVERVIEW We are seeking a highly motivated Photonics Fabrication and Design Engineer to develop the cryogenic photonic networks central to our technology platform. In this role, you will contribute to the design of SiN-based passive photonic components and take full ownership of the R&D prototyping lifecycle. You will perform hands-on device fabrication at a cleanroom facility located near our Boulder office. This is a high-ownership position with substantial influence on the pace and direction of our hardware development. KEY RESPONSIBILITIES - Own end-to-end prototype fabrication runs in a research cleanroom environment. - Develop, execute, and optimize manufacturable fabrication processes for integrated photonic devices and superconducting devices, including SNSPDs. - Design, simulate and optimize passive silicon nitride (SiN) photonic components such as (e.g., grating couplers, splitters, mode converters, edge couplers and optical I/O). - Establish standard operating procedures (SOPs) and process flows into stable Processes of Record (POR). - Contribute to the development and maintenance of internal Process Design Kits (PDKs) and component libraries. - Work closely with test, packaging, and systems integration teams to correlate device performance with fabrication metrics, accelerating our design-build-test-learn cycles. QUALIFICATIONS & SKILLS Required: - BS, MS or PhD in physics, electrical engineering, optics, materials science, or a related field; or equivalent practical experience. - Hands-on experience in microfabrication, nanofabrication, or semiconductor processing. - Experience with fabricating devices on at least one of these platforms: silicon photonics, silicon nitride, and/or superconducting electronics. - Strong background in passive photonic component design with proficiency in industry-standard electromagnetic simulation software (e.g., Ansys Lumerical, Tidy3D). - Solid understanding of photonic layout concepts, Design Rule Checking (DRC), and familiarity with standard layout tools (e.g., KLayout, Luceda, Cadence). Preferred: - Experience with SNSPD fabrication. - Experience with heterogeneous or hybrid integration methods such as bump bonding or fusion bonding. - Experience transferring processes to external fabs or working with foundries. - Previous fabrication background utilizing shared, multi-user facilities such as university cleanrooms, national laboratories, or advanced commercial R&D centers. BENEFITS AND PERKS - Meaningful equity ownership in an early-stage deep tech company - Employer-matched 401(k) - Health, dental, vision, and life insurance - Flexible PTO - Support for ongoing learning, conference attendance, and skill development Our culture is onsite by default (we're founded by scientists who are used to working in the lab), with flexibility for hybrid arrangements. For the right person and role, we're open to filling roles remotely