Senior/Principal Hardware Engineer – High-Speed RF / Signal Integrity (On-site)

About Polaris Electro-OpticsPolaris Electro-Optics is a rapidly growing photonics company developing breakthroughoptical interconnect technology for data centers, AI, and high-performance computing.Their proprietary FenGlass™ platform integrates ferroelectric nematic materials into siliconphotonics, enabling faster, compact, and more energy-efficient solutions. Located in SanDiego and backed by substantial funding, Polaris is scaling to meet demand from hyperscalecustomers and transceiver suppliers.Role SummaryWe are looking for a Senior or Principal Hardware Engineer to own the high-speed electrical implementation and signal-integrity validation of next-generation optical interconnect hardware. This role is highly hands-on and focused on the RF and signal-integrity implementation of next-generation optical interconnect hardware. The engineer will work closely with internal photonics, systems, packaging, and test teams to translate system-level requirements into robust high-speed electrical interfaces and hardware, then carry those designs through simulation, fabrication, bring-up, characterization, and qualification. The role will also serve as a key technical interface to OSATs, substrate and PCB vendors, connector suppliers, and high-speed component partners.ResponsibilitiesDesign high-speed PCBs and contribute to substrate/SLP electrical interface definition for >100 GBaud-class signaling. Work with OSATs and substrate vendors on SLP stack-up, routing constraints, bump interfaces, manufacturability, and high-speed electrical performance.Own the architecture and implementation of high-speed electrical interfaces and RF hardware for optical interconnect systems.Perform pre-layout and post-layout SI analysis using S-parameters, channel simulation, and electromagnetic simulation as appropriate.Define high-speed interfaces between test equipment, MZM drivers, TIAs, photonic modules, and host electronics.Work closely with photonics, package, systems, and test engineers to optimize electrical/optical co-design.Lead high-speed board bring-up, debug, characterization, and failure analysis.Define and execute qualification plans for high-speed PCB and substrate interfaces, including insertion loss, return loss, crosstalk, impedance, skew, and signal-quality validation. QualificationsB.S., M.S., or Ph.D. in Electrical Engineering or related field.Significant industry experience in high-speed hardware and signal-integrity design.Strong background in signal integrity for multi-tens-of-GHz electrical interfaces.Experience designing and bringing up high-speed PCBs using low-loss or hybrid RF stack-ups.Deep understanding of differential signaling, transmission lines, impedance control, reflections, loss, crosstalk, and power integrity.Experience with S-parameters, VNA measurements, oscilloscopes, high-speed pattern generators/BERTs, and related RF test equipment.Experience with one or more SI/EM tools such as Ansys HFSS/SIwave, Cadence Sigrity, or equivalent.Comfortable working hands-on in the lab and debugging first-of-kind hardware.Able to make technical decisions with incomplete information and rapidly converge toward a working system.PreferredExperience with optical transceivers, silicon photonics, linear-drive optics, or SerDes interfaces.Experience with 50 GBaud or >100 GBaud PAM4 electrical links.Experience integrating linear MZM drivers and TIAs.Familiarity with IEEE 802.3, OIF CEI, or related datacom standards.