About Lumilens

At Lumilens we are building the critical photonics infrastructure that powers tomorrow's AI supercomputing. From chip-to-chip optical interconnects to scalable photonic engines, Lumilens is unlocking a new era of computing faster, cooler, and massively more efficient.

We're a well-funded startup backed by Mayfield and led by veterans who've built and scaled some of the most transformative technologies in the industry. At Lumilens, we're developing high-speed photonics products purpose built to power the future of AI infrastructure and high-performance computing.

This isn't incremental innovation, it's a ground floor opportunity to rethink the optical layer from the silicon up. You'll work alongside a team of world class engineers solving some of the hardest challenges in scaling optical systems. Every line of code, every design decision, every breakthrough you help deliver will shape the infrastructure of tomorrow.

If you're looking for mission, momentum, and the chance to make an outsized impact, jump on the rocket ship. We're just getting started.

Role Overview

You will design high-speed silicon photonic integrated circuits operating at the limits of bandwidth and integration, and take them from concept → tapeout → silicon validation.

This role is suitable for strong PhD graduates through early-career engineers (0–5 years experience) who want to work on real, production-bound systems, not just simulations.

Roles & Responsibilities

Design and optimize silicon photonic devices and circuits, including:
High-speed modulators (MZI, ring, advanced structures)
Photodetectors and receiver building blocks
Passive components (couplers, filters, routing)
Perform multi-domain simulations (EM, circuit, thermal) to meet targets in:
Bandwidth (200G/lane+)
Insertion loss, extinction ratio, efficiency
Implement PIC layouts (GDS) using foundry PDKs and support tapeouts
Co-design with electronics and packaging teams for CPO/NPO systems:
RF effects, parasitics, signal integrity, and thermal constraints
Support silicon bring-up and characterization:
Correlate measurement vs simulation
Drive design iterations and improvements
Contribute to design libraries, modeling, and methodology development

Requirements

Education
PhD in Electrical Engineering, Physics, or related field (silicon photonics or closely related area)
Experience
0–5 years of relevant experience (including fresh PhD graduates)
Technical Skills
Experience in design and simulation of silicon photonic devices or PICs
Strong understanding of guided-wave optics and device physics
Familiarity with tools such as Lumerical, COMSOL, or equivalent
Implementation Skills
Exposure to PIC layout and tapeout flows (PDK, DRC/LVS)
System Awareness
Basic understanding of optical communication systems and/or RF effects

Nice to Have

Experience with high-speed devices (>100 GHz bandwidth or equivalent)
Exposure to CPO/NPO or optical transceiver architectures
Familiarity with SiPh + III-V integration
Experience with inverse design / adjoint methods (e.g., Meep)

Why Join Us

Work on real products at 200G/lane+, not just research prototypes
Direct impact on AI infrastructure and hyperscale systems
Fast iteration cycles from design → silicon → system
High ownership early in your career
Comprehensive benefits package including health insurance
Collaborative environment with world-class engineering and R&D teams

Senior Silicon Photonics Engineer (PIC Design)