Senior Photonics Design, Layout & Modeling Engineer

About the Team

Infleqtion is commercializing quantum technology, building deployable systems where photonics is the engine for performance, scale, and reliability. Our photonics team develops integrated photonics (PICs) and related optical subsystems that enable chip-scale laser sources, modulation, routing, and control for next-generation quantum products. We work closely with quantum system teams, and external foundry/assembly partners to turn ambitious optical performance targets into manufacturable hardware.

About the Role

Infleqtion is seeking a Senior Photonics Design, Layout & Modeling Engineer to design and deliver next-generation photonic integrated circuits and photonic subassemblies, with an emphasis on simulation-driven design, layout/verification, and rapid experimental feedback.

In this role, you will own portions of PIC design from concept through tapeout and test—translating system requirements into photonic building blocks (passives, couplers, resonators, filters, modulators, etc.), performing rigorous EM/photonic modeling, completing layout and verification, and partnering with the lab team to characterize devices and iterate quickly.

We are looking for a highly motivated individual who thrives in ambiguity, enjoys working in a small, dynamic team environment, and has a passion for solving hard problems that lead to high-impact technological advances.

How you will drive impact

• 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.