Electro-Optical Interconnect Packaging Development Hardware Engineer (Onsite) (San Jose)

The application window is expected to close on: 09/30/2026Job posting may be removed earlier if the position is filled or if a sufficient number of applications are received.This position requires that you live within commuting distance of our San Jose, CA office and commute to the office 5 days per week. Meet the TeamThe Common Hardware Group (CHG) creates innovative hardware platforms central to the AI era, powering Cisco’s core Switching, Routing, and Wireless products for organizations globally. Our innovations in silicon, optics, and hardware platforms—like Silicon One—are shaping the technology industry. We're a global team of creative experts, bringing our unique backgrounds and bold ideas to push boundaries and help each other grow. Because full product development—from design to qualification to production—is within our team, we’re able to think differently, experiment more, and work quickly. Join us to power the future of the digital world.Cisco Silicon One (#CiscoSiliconOne) is a business organization with a long track record of building complex and high-performance Silicon ASICs. Our silicon devices drive the world’s most complex networks and carry over 90% of IP traffic. Cisco Silicon One is the only unifying silicon architecture in the market that enables customers to deploy the best-of-breed silicon from Top of Rack (TOR) switches all the way through web scale data centers and across service provider, enterprise networks, and data centers with a fully unified routing and switching portfolio. We are a highly specialized ASIC team with experts in all aspects of advanced IC package design and heterogeneous system integration. Our substrates use the latest 2.5D fanout technologies for large-scale integration, using the latest signaling and data transfer technologies. Come join us and take part in shaping Cisco's ground-breaking solutions by designing, developing and testing some of the most complex ASICs being developed in the industry!Your ImpactAs an Interconnect Packaging Development Engineer within the Silicon Core team, you will operate at the intersection of advanced packaging technology and strategic execution. You will be a key member of the platform development team responsible for designing, qualifying, validating, and debugging critical packaging technology building blocks, processes, and tools that support Cisco’s cutting-edge Silicon One ASIC roadmaps. In this highly collaborative role, you will partner with design engineering, operations, and supply chain teams to innovate next-generation technologies, including co-packaged optics and co-packaged copper. You will also engage directly with external OSATs, Fabs, contract manufacturers, and key suppliers to drive validation and problem-solving efforts. SI/PI Simulation & Analysis: Perform comprehensive Signal and Power Integrity (SI/PI) analysis and modeling using simulation tools including Ansys HFSS, Siwave, Q3D, and Keysight Pathwave ADS. Test Vehicle Definition: Define and specify advanced IC packaging test vehicles designed to provide empirically derived data for SI/PI tool verification. Model-to-Measurement Correlation: Provide rigorous model verification by synchronizing simulation models with physical, measured data to ensure high-fidelity predictive modeling. Thermal & Material Characterization: Conduct thermal analysis using tools like TMA, DMA, TGA, or DSC to evaluate laminate properties (e.g., Tg, CTE, outgassing), Dielectric Modeling: Perform Fabry Perot dielectric and Copper material characterization, matching empirical measured data to simulation. Generate and deliver frequency-dependent IC-packaging dielectric material models over temperature for use in simulation tools. Reliability & Material Qualification: Conduct hands-on reliability and material qualification testing to proactively identify and mitigate risks, resolving complex packaging issues. Failure Analysis (FA): Support quality investigations by performing root-cause failure analysis, executing material cross-sectioning, vacuum potting, polishing, and SEM/EDS imaging. On-the-Fly Prototyping: Utilize 3D CAD (Autodesk Fusion), 3D printing, and basic machining (CNC milling) to design and fabricate custom fixturing solutions to address immediate lab measurement challenges. Technical Documentation & Collaboration: Develop technical requirements for advanced packaging, build measurement-driven databases to correlate thermo-mechanical and electro-optical impacts, and collaborate with test infrastructure vendors on tool procurement and bring-up. Key Lab Functions & Capabilities CoveredDue to the comprehensive nature of our advanced packaging lab, the ideal candidate will actively manage and perform work across three primary domains: High-Frequency Electrical, Optical & Simulation Testing: Operating 120-250 GHz VNAs, executing S-parameter probe measurements, managing VNA calibration, and utilizing optical benches, fiber probes, and optical microscopy. Running advanced electromagnetic and system-level simulations (HFSS, ADS) to correlate with physical measurements. Laminate, Thermal & Packaging Characterization: Performing sample preparation (diamond saws, polishing instruments, vacuum potting) and operating Scanning Electron Microscopes (SEM) with Energy Dispersive X-Ray Spectroscopy (EDS/EDX). Conducting thermal analysis (TMA, DMA, TGA, DSC) and dielectric characterization (Fabry Perot, Dielectric Constant, surface roughness). Mechanical Fixturing & Prototyping: Designing custom fixtures using 3D CAD and fabricating them using CNC mills and 3D printers to facilitate complex measurements. Minimum Qualifications Bachelor's degree in Electrical Engineering and 7+ years of relevant experience, or Master's degree in Electrical Engineering and 4+ years of relevant experience, or PhD in Electrical Engineering and 1+ years of related experience, or equivalent related work experience. 7+ years of hands-on laboratory experience with precision measurement equipment. RF/Electrical Lab Expertise: Proven experience with high-frequency Vector Network Analyzers (VNA), S-parameter probe measurements, and high-frequency calibration methodologies. Materials & Sample Prep: Experience with sample preparation (cross-sectioning, polishing, potting) and operating SEM/EDS systems for failure analysis. Preferred QualificationsSafety & Operations: Demonstrated ability to work collaboratively, independently, and safely in a lab environment with highly sensitive devices under test (DUTs). Simulation & Modeling Tools: Strong working knowledge of SI/PI simulation suites, including Ansys HFSS, Siwave, Q3D, and Keysight Pathwave ADS. Thermal & Dielectric Characterization: Hands-on experience conducting thermal analysis using the Fabry Perot Resonator to measure Dielectric Loss, Dielectric Constant, and surface roughness. Signal Integrity & Calibration: Deep knowledge of SI calibration and test flows for both fixtured and micro-probing configurations up to mmWave frequencies (including TDR). Optical Instrumentation: Hands-on experience with optical spectrum analyzers (OSA), optical frequency domain reflectometry (OFDR), optical benches, and fiber probes. Mechanical Prototyping: Working knowledge of 3D CAD generation (Autodesk Fusion), 3D printing, and basic machining/fabrication (milling, CNC instruments) to generate custom fixtures. Vendor Management: Experience proactively engaging with test infrastructure vendors to assess roadmaps, define requirements, coordinate procurement, and lead tool bring-up. Multidisciplinary Mindset: A strong willingness to continuously learn and evolve professionally across mechanical, thermal, and material science domains. Why Cisco? At Cisco, we’re revolutionizing how data and infrastructure connect and protect organizations in the AI era – and beyond. We’ve been innovating fearlessly for 40 years to create solutions that power how humans and technology work together across the physical and digital worlds. These solutions provide customers with unparalleled security, visibility, and insights across the entire digital footprint.Fueled by the depth and breadth of our technology, we experiment and create meaningful solutions. Add to that our worldwide network of doers and experts, and you’ll see that the opportunities to grow and build are limitless. We work as a team, collaborating with empathy to make really big things happen on a global scale. Because our solutions are everywhere, our impact is everywhere. We are Cisco, and our power starts with you. Message to applicants applying to work in the U.S. and/or Canada:The starting salary range posted for this position is $165,000.00 to $241,400.00 and reflects the projected salary range for new hires in this position in U.S. and/or Canada locations, not including incentive compensation*, equity, or benefits.Individual pay is determined by the candidate's hiring location, market conditions, job-related skillset, experience, qualifications, education, certifications, and/or training. The full salary range for certain locations is listed below. For locations not listed below, the recruiter can share more details about compensation for the role in your location during the hiring process.U.S. employees are offered benefits, subject to Cisco’s plan eligibility rules, which include medical, dental and vision insurance, a 401(k) plan with a Cisco matching contribution, paid parental leave, short and long-term disability coverage, and basic life insurance. Please see the Cisco careers site to discover more benefits and perks. Employees may be eligible to receive grants of Cisco restricted stock units, which vest following continued employment with Cisco for defined periods of time.U.S. employees are eligible for paid time away as described below, subject to Cisco’s policies:10 paid holidays per full calendar year, plus 1 floating holiday for non-exempt e