Cspeed IO is a stealth start up backed by Sutter Hill Ventures and Atreides Capital - headquartered in Palo Alto, CA. Our executive team has a demonstrated track record of building and scaling category-defining semiconductor and infrastructure businesses at companies like Broadcom, Lumentum, Tesla, Apple, Samsung, Intel, and VMware.

Cspeed IO is developing next-generation optical semiconductor solutions for the AI infrastructure market, focused on enabling true “scale-up” architectures. Our mission is to replace traditional copper interconnects with advanced fiber-optic technologies that overcome the limitations of existing optics solutions and architectures.

We are seeking a PCB Design & Validation Engineer to own the design of test/eval boards and lead validation of our high-speed optical transceivers. You will design the PCB platforms that enable development and characterization, with the opportunity to lead PCB design for the transceiver module itself. You will review transceiver requirements, develop validation plans, and execute them across all major subsystems: Ethernet SerDes, internal data pipeline, laser/modulator, mux/demux, and the MCU controller with EEPROM and I2C interfaces.

Key Responsibilities

PCB Design

Own schematic capture, component selection, and layout for test/eval boards, development platforms, and transceiver module PCBs
Design multi-layer, controlled-impedance boards with high-speed NRZ routing, mixed-signal considerations, and PDN design
Manage DRC, fab outputs (Gerbers, assembly drawings), vendor coordination; maintain schematic/footprint libraries

Validation & Characterization

Develop and execute validation plans covering silicon, module, and system-level testing with defined pass/fail criteria
Characterize SerDes performance (jitter, eye diagrams, BER, equalization) and validate data pipeline throughput across PVT corners
Validate optical subsystems (laser/modulator power, extinction ratio, wavelength stability; mux/demux isolation, insertion loss)
Test MCU firmware interactions, boot sequences, EEPROM integrity, I2C compliance, and CMIS register map implementation
Execute host interop testing, standards compliance (IEEE 802.3, CMIS, OIF), and reliability sequences (HTOL, thermal cycling)
Build test setups and Python automation; create data analysis pipelines; document procedures and results

Required Qualifications

5+ years in PCB design and/or hardware validation for high-speed digital/optical systems
Proficiency with PCB design tools (Altium Designer, Cadence Allegro, or equivalent); multi-layer boards with controlled impedance
Hands-on high-speed serial link validation: eye diagrams, BER testing, jitter analysis, S-parameters
Proficiency with lab instrumentation: real-time oscilloscopes, BERT, optical power meters, VNA, TDR
Understanding of transceiver architectures and subsystems (SerDes, TIA, driver, laser, modulator)
Python scripting for test automation; familiarity with I2C, SPI, and serial protocols
BS/MS in Electrical Engineering or equivalent

Preferred Qualifications

Experience with NRZ optical transceiver validation and silicon characterization across PVT corners
Familiarity with SI/PI simulation tools (HyperLynx, HFSS, ADS); flex-rigid or HDI PCB design experience
Experience with CMIS or similar management interfaces; Ethernet compliance testing
Knowledge of reliability testing methodologies (Telcordia, JEDEC) and FEC performance validation
Experience in a startup or fast-paced development environment

Learn more about this Employer on their Career Site