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HIGH SPEED PHOTONIC INTEGRATED CIRCUIT DESIGNER Mesh Optical Technologies was founded on the belief that optical photons will be at the center of advanced technologies in the coming century. Making advanced technology ubiquitous means building at scale, and that’s exactly what we’re doing at Mesh. At the heart of next-generation optical links are high-speed electro-optic modulators and transmitters pushing tens of gigahertz and beyond. We are seeking a High Speed Photonic Integrated Circuit Designer to lead the design, simulation, and tape-out of advanced modulator circuits across silicon photonics, III–V, and other platforms. You will drive photonic components from concept through foundry fabrication—owning device modeling, RF co-design, and performance optimization to deliver production-ready transmitters for coherent and direct-detect systems at scale. RESPONSIBILITIES: Design, simulate, and optimize high-speed electro-optic modulators and integrated photonic circuits across silicon photonics and III–V platforms (e.g., InP/InGaAsP), with applications spanning advanced coherent and IM/DD transmitters Drive photonic tape-outs end-to-end, including circuit design, DOE planning, hands-on layout, foundry interfacing, and coordination with packaging and electronic driver stakeholders Own device, circuit, and system modeling workflows using industry tools (e.g., Lumerical Mode/FDTD/Interconnect, BeamPROP, HFSS, ADS/Ansys Designer, VPI), and develop models that incorporate process variation and fab non-idealities Lead RF, signal integrity, and high-speed interconnect design from die to carrier/package/PCB, including co-design of chip, carrier, RF package, and chip-on-carrier interconnects; identify and resolve signal integrity issues across the link Partner with driver and packaging teams/suppliers to optimize end-to-end modulator + driver performance, including impedance matching, bandwidth, voltage swing, and power/thermal constraints Define design-for-test strategies and collaborate with test and assembly teams to plan and execute automated, high-volume characterization and assembly-level validation; develop new test methods as needed Analyze measurement results (e.g., EO S-parameters/S21, eye diagrams, mask margin, RIN, chirp) and correlate test and physical data (including SEM/fab feedback) to models to drive root-cause analysis and performance improvement QUALIFICATIONS: Master’s or PhD in electrical engineering, applied physics, optical engineering, or a related discipline 3+ years of industrial experience in integrated photonics, including design and modeling of passive and active components with emphasis on electro-optic phase shifters/modulators Demonstrated experience designing high-speed photonic devices (10+ GHz bandwidth and beyond preferred) and understanding key transmitter architectures (e.g., PAM4, coherent formats) Proficiency with photonic simulation tools (e.g., Ansys Lumerical; COMSOL, Tidy3D/Meep, or similar) and familiarity with photonic circuit modeling (e.g., Interconnect/SAX or equivalent) Working knowledge of RF fundamentals and signal integrity; experience with EM/SI simulation tools (e.g., HFSS, ADS, Ansys Designer) Photonic layout and tapeout experience (e.g., IPKISS, GDSFactory, or similar) and understanding of foundry processes and design rules Strong programming and data analysis skills (e.g., Python and/or MATLAB) for automation, visualization, and data-driven design decisions Strong communication skills and ability to work independently in a fast-moving, cross-functional team Willingness to work extended hours and weekends as needed PREFERRED EXPERIENCE: Deep expertise in high-bandwidth, low-voltage modulator design across material systems (e.g., doped silicon, thin-film lithium niobate, BTO, InP/GaAs/AlGaAs/InGaAsP), including large-signal behavior and practical transmitter integration Experience with chip-to-package co-d