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Infleqtion · 22 hours ago

Senior Photonics Design, Layout & Modeling Engineer

Louisville, CO

Full-time

Onsite

Mid, Senior Level

4+ years exp

Infleqtion is commercializing quantum technology, building deployable systems where photonics is the engine for performance, scale, and reliability. They are seeking a Senior Photonics Design, Layout & Modeling Engineer to design and deliver next-generation photonic integrated circuits and photonic subassemblies, focusing on simulation-driven design and rapid experimental feedback.

ElectronicsManufacturingMechanical DesignMechanical EngineeringQuantum Computing

No H1B

U.S. Citizen Only

Responsibilities

Own and deliver high-performance photonic component designs and PIC layouts that meet aggressive specs (loss, bandwidth, phase stability, power handling, crosstalk, yield)

Build simulation-to-layout workflows that accelerate design cycles (PDK integration, reusable parameterized cells, verification automation)

Drive tapeout readiness: coordination, foundry alignment, mask submission deliverables, and post-tapeout debug loops

Close the loop with the lab: define test plans, review data, troubleshoot discrepancies, and translate measurements into actionable design improvements

Collaborate across teams to ensure PIC-level design choices support system-level performance, reliability, and manufacturability

Qualification

Integrated photonics designPhotonics simulationModelingPhotonic layoutVerificationPython for automationExperimental optical techniquesCollaboration with partnersCommunication skills

Required

M.S. or Ph.D. in Electrical Engineering, Applied Physics, Photonics, or a related field (or equivalent practical experience)

[4]+ years of relevant experience designing integrated photonics (Si, SiN, InP, or related platforms) with demonstrated taped-out designs or comparable project outcomes

Advanced proficiency in photonics simulation and modeling (e.g., EME, FDTD, FEM, BPM, eigenmode, circuit-level/Interconnect modeling) and comfort validating models against measurement

Hands-on experience with photonic layout and verification (PDK usage, hierarchy management, mask/tapeout deliverables)

Proficiency with Python for design automation, analysis, and workflow tooling; comfort working with version control (Git)

Practical experimental familiarity: common optical test equipment and techniques (fiber coupling/alignment, insertion loss, spectrum analysis, polarization handling, interferometric/phase-sensitive measurements, basic RF/optical modulation measurements)

This position involves access to export-controlled information and/or technology. To comply with U.S. Export Control laws and regulations, candidates must be a U.S. Person (U.S. citizen, U.S. lawful permanent resident)

Preferred

Multiple tapeouts at commercial foundries, including direct foundry interface and post-silicon debug

Experience with common photonics toolchains (e.g., Lumerical, Synopsys, COMSOL) and layout stacks (e.g., KLayout, gdsfactory)

Experience designing PIC-based laser subsystems (hybrid/heterogeneous gain integration), micro-combs, narrow-linewidth sources, or frequency control photonics

Familiarity with photonic packaging constraints (edge/vertical coupling, alignment tolerances, thermal effects) and how they feed back into PIC design

Strong communication and presentation skills; ability to work effectively with external partners (foundries, packaging, vendors)