{"schemaVersion":"jobsearcher.job.v1","id":"59ee923446c7c2fcf70e5f00","url":"https://jobsearcher.com/jobs/59ee923446c7c2fcf70e5f00","canonicalUrl":"https://jobsearcher.com/jobs/59ee923446c7c2fcf70e5f00","title":"FEA Packaging Engineer","description":"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.\r\nCspeed 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.\r\nThe RoleThis position performs finite element analysis for CspeedIO optical engine packages across both thermal and structural domains. It is scoped for a strong FEA engineer: demonstrated depth in either thermal or mechanical analysis is expected, and the ability to work competently in the other is required.\r\nThe analysis supports package architecture decisions and qualification. Temperature governs optical wavelength and channel uniformity. Deformation and interconnect stress govern assembly yield, reliability, and optical coupling, since warpage displaces optical facets. Both sets of results terminate in the same design decisions, which is why the scope is held in one role.\r\nCorrelation against measured hardware is a standing expectation. Results are used for design sign-off, so assumptions must be documented and defensible.\r\nResponsibilitiesThermal analysis\r\nBuild and maintain thermal models spanning die, package, interface materials, lid, and cold plate, and establish cooling boundary conditions and their validity limits.\r\nResolve the temperature field across the photonic IC to the resolution photonic design requires, and define the heat extraction path and interface material selection for high-flux die within the assembly.\r\nStructural analysis\r\nPredict warpage through the assembly process, and own the flatness, coplanarity, and facet planarity budgets that assembly and optical coupling depend on.\r\nAnalyze bump and interconnect stress, chip-package interaction, and fatigue life, supporting qualification against JEDEC or equivalent methodology.\r\nMethodology and correlation\r\nDefine modeling standards and document assumptions such that results are auditable.\r\nLead correlation against measured temperature, warpage, cross-section, and reliability data, and revise methodology accordingly.\r\nDesign and supplier support\r\nProvide requirements, constraints, and sign-off criteria during architecture definition rather than after design freeze.\r\nEngage substrate suppliers, OSATs, and cooling and material vendors on process assumptions and measured data.\r\nRequired QualificationsMS or PhD in Mechanical Engineering, Materials Science, Engineering Mechanics, or equivalent practical background.\r\n6+ years of finite element analysis for semiconductor packaging or electronic systems, including one product carried from architecture through hardware correlation.\r\nExpert proficiency in one commercial FEA or CFD tool and working proficiency in a second covering the other domain — for example Ansys Mechanical or Abaqus alongside Icepak, Fluent, Flotherm, or Celsius.\r\nSound FEA fundamentals: meshing judgment, boundary condition selection, convergence, and the ability to defend a model rather than only to run one.\r\nDemonstrated correlation of simulation against physical measurement, and the judgment to distinguish a modeling error from a process excursion.\r\nExperience with advanced packaging construction: flip chip, 2.5D/3D, interposers, and heterogeneous integration.\r\nPreferred QualificationsDepth in nonlinear and time-dependent material behavior: creep, viscoplasticity, viscoelasticity, and fatigue.\r\nSilicon photonics or optoelectronic packaging, including thermo-optic sensitivity or warpage as an optical alignment constraint.\r\nCoupled thermal-structural workflows, including transfer of a computed temperature field into a structural model.\r\nDirect-to-chip liquid cooling, or chip-package interaction and low-k dielectric stress.\r\nScripting for model automation and parametric studies, and design of experiments methodology.\r\nScope and ImpactThis position provides the physics basis for package architecture decisions and qualification.#J-18808-Ljbffr","company":"Cscale","rawCompany":"cscale","city":"Brooklyn","state":"NY","isRemote":false,"isActive":false,"createdAt":"2026-10-04T01:24:45.291Z","occupations":[{"code":"17-2199.00","title":"Engineers, All Other","slug":"engineers-all-other"},{"code":"17-2199.07","title":"Photonics Engineers","slug":"photonics-engineers"},{"code":"17-2141.00","title":"Mechanical Engineers","slug":"mechanical-engineers"}],"industries":[{"code":"334413","title":"Semiconductor and Related Device Manufacturing","slug":"semiconductor-and-related-device-manufacturing"},{"code":"541715","title":"Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)","slug":"research-and-development-in-the-physical-engineering-and-life-sciences-except-nanotechnology-and-biotechnology"},{"code":"541330","title":"Engineering Services","slug":"engineering-services"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"FEA Packaging Engineer","description":"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.\r\nCspeed 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.\r\nThe RoleThis position performs finite element analysis for CspeedIO optical engine packages across both thermal and structural domains. It is scoped for a strong FEA engineer: demonstrated depth in either thermal or mechanical analysis is expected, and the ability to work competently in the other is required.\r\nThe analysis supports package architecture decisions and qualification. Temperature governs optical wavelength and channel uniformity. Deformation and interconnect stress govern assembly yield, reliability, and optical coupling, since warpage displaces optical facets. Both sets of results terminate in the same design decisions, which is why the scope is held in one role.\r\nCorrelation against measured hardware is a standing expectation. Results are used for design sign-off, so assumptions must be documented and defensible.\r\nResponsibilitiesThermal analysis\r\nBuild and maintain thermal models spanning die, package, interface materials, lid, and cold plate, and establish cooling boundary conditions and their validity limits.\r\nResolve the temperature field across the photonic IC to the resolution photonic design requires, and define the heat extraction path and interface material selection for high-flux die within the assembly.\r\nStructural analysis\r\nPredict warpage through the assembly process, and own the flatness, coplanarity, and facet planarity budgets that assembly and optical coupling depend on.\r\nAnalyze bump and interconnect stress, chip-package interaction, and fatigue life, supporting qualification against JEDEC or equivalent methodology.\r\nMethodology and correlation\r\nDefine modeling standards and document assumptions such that results are auditable.\r\nLead correlation against measured temperature, warpage, cross-section, and reliability data, and revise methodology accordingly.\r\nDesign and supplier support\r\nProvide requirements, constraints, and sign-off criteria during architecture definition rather than after design freeze.\r\nEngage substrate suppliers, OSATs, and cooling and material vendors on process assumptions and measured data.\r\nRequired QualificationsMS or PhD in Mechanical Engineering, Materials Science, Engineering Mechanics, or equivalent practical background.\r\n6+ years of finite element analysis for semiconductor packaging or electronic systems, including one product carried from architecture through hardware correlation.\r\nExpert proficiency in one commercial FEA or CFD tool and working proficiency in a second covering the other domain — for example Ansys Mechanical or Abaqus alongside Icepak, Fluent, Flotherm, or Celsius.\r\nSound FEA fundamentals: meshing judgment, boundary condition selection, convergence, and the ability to defend a model rather than only to run one.\r\nDemonstrated correlation of simulation against physical measurement, and the judgment to distinguish a modeling error from a process excursion.\r\nExperience with advanced packaging construction: flip chip, 2.5D/3D, interposers, and heterogeneous integration.\r\nPreferred QualificationsDepth in nonlinear and time-dependent material behavior: creep, viscoplasticity, viscoelasticity, and fatigue.\r\nSilicon photonics or optoelectronic packaging, including thermo-optic sensitivity or warpage as an optical alignment constraint.\r\nCoupled thermal-structural workflows, including transfer of a computed temperature field into a structural model.\r\nDirect-to-chip liquid cooling, or chip-package interaction and low-k dielectric stress.\r\nScripting for model automation and parametric studies, and design of experiments methodology.\r\nScope and ImpactThis position provides the physics basis for package architecture decisions and qualification.#J-18808-Ljbffr","datePosted":"2026-10-04T01:24:45.291Z","dateModified":"2026-10-04T01:24:45.291Z","hiringOrganization":{"@type":"Organization","name":"Cscale","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Brooklyn","addressRegion":"NY","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"59ee923446c7c2fcf70e5f00"},"url":"https://jobsearcher.com/jobs/59ee923446c7c2fcf70e5f00"}}