Flex Job - 44802993 | CareerArc
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Company: Flex
Location: Milpitas, CA
Career Level: Mid-Senior Level
Industries: Technology, Software, IT, Electronics


At Flex, we welcome people of all backgrounds. Our employees thrive here by living our values: we support each other as we strive to find a better way, we move fast with discipline and purpose, and we do the right thing always. Through a respectful, inclusive and collaborative culture, a career at Flex offers the opportunity to make a difference, invest in your career growth and join our purpose -- to make great products that create value and improve people's lives. Job Summary

To support our extraordinary teams who build great products and contribute to our growth, we're looking to add a Senior SI & Simulation Engineer located in Austin, TX, Milpitas, CA or Seattle, WA.

Reporting to the Senior Director, Server & Storage Engineering the Senior SI & Simulation Engineer will be part of a team which designs and delivers, Server & Storage products to Cloud, Enterprise, and Edge customers, and platforms internal to Flex, through end-to-end development involving concept, architecture, design, validation, and release phases.


  • Model, design, and characterize, complex electrical signaling channels, to determine line-loss and cross-talk profiles for those channels.
  • Set up electrical signal channel simulation decks, and execute end-to-end simulations on high-speed serial and parallel interfaces such as PCIe, xGbE, and DDRx SDRAM.
  • Collaborate with the design team, to determine best-fit components in electrical channels, optimize Chassis-level clock-trees, power distribution topologies, and grounding strategies.
  • Develop PCB stack-ups, through PCB dielectric material selection, determination of trace-geometries & via patterns, and other channel features.
  • Perform PI analysis for power delivery topologies.
  • Generate PCB CAD guidelines for interfaces and support PCB CAD Engineers in PCB design.
  • Support compilation & review of test-plans, and provide hands-on validation support.
  • Performance characterization and correlation of simulation results with empirical lab measurements, using oscilloscopes, TDR meters, VNAs, and spectrum analyzers.
  • Measurement of eye-margins, jitter, and BER, using oscilloscopes and silicon SI capabilities.


  • Bachelor's or higher degree in Electrical Engineering, Physics, or similar field.
  • Minimum of 10 years of hands-on experience, in electrical channel simulations, and Signal Integrity work, including modeling, simulating, and characterizing, complex high-speed electrical channels for interfaces such as PCIe and DDRx SDRAM.
  • Solid understanding of general transmission line theory, characteristic impedances, reflections, terminations, coupling techniques, skin-effect, cross-talk, fiber-weave effect, insertion loss, and return loss.
  • Sound knowledge of electromagnetics, EMI/EMC concepts, and associated mitigation options.
  • Hands-on experience working with S-parameters and IBIS-AMI & HSPICE models.
  • Experience with time-domain & frequency-domain SI simulation tools, PI tools, and 3D/2D EM field solvers such as Pathwave ADS, HFSS, Sigrity, and SiWave.
  • Amplitude and timing equalization techniques in transceivers ; jitter fundamentals & mitigation techniques, BER measurement ; serial channel re-timer experience.
  • Lab validation experience with logic analyzers, protocol analyzers, high-end oscilloscopes, and frequency response analyzers, from major manufacturers such as Tektronix, Keysight, and LeCroy.


  • Hands-on electrical channel modeling, simulation, and validation experience with PCAs for single, dual, or multi-socket Motherboards with Intel Xeon and AMD EPYC CPUs, backplane boards, and adapter cards.
  • Experience with modeling, simulating, and validating ‘25Gbps or higher data-rate per lane' differential electrical channels, using PAM-4 signaling.
  • Expertise in low-Dk, low-Df higher-performance PCB dielectric materials.
  • Compliance testing on key interfaces such as PCIe and USB.

What you'll receive for the great work you provide:

  • Full range of medical benefits, dental, vision
  • Life Insurance
  • Matching 401K
  • PTO
  • Tuition Reimbursement
  • Employee discounts at local retailers


Job Category Design, Process & Technology Engineering

Is Sponsorship Available?

NoFlex is an Equal Opportunity Employer and employment selection decisions are based on merit, qualifications, and abilities. We celebrate diversity and do not discriminate based on: age, race, religion, color, sex, national origin, marital status, sexual orientation, gender identity, veteran status, disability, pregnancy status, or any other status protected by law. We're happy to provide reasonable accommodations to those with a disability for assistance in the recruitment process. Please advise us of any accommodations you may need by e-mailing: accessibility@flex.com.

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