Thermo-Mech CFD Simulation Intern - Fall 2026

About EtchedEtched is building the world’s first AI inference system purpose-built for transformers - delivering over 10x higher performance and dramatically lower cost and latency than a B200. With Etched ASICs, you can build products that would be impossible with GPUs, like real-time video generation models and extremely deep & parallel chain-of-thought reasoning agents. Backed by hundreds of millions from top-tier investors and staffed by leading engineers, Etched is redefining the infrastructure layer for the fastest growing industry in history.Job SummaryWe are seeking a talented Thermo-Mechanical, CFD Simulation Engineering Intern focused on Chip-on-Wafer-on-Substrate (CoWoS) package development to join our Advanced IC Packaging Team. You'll use tools like ANSYS Mechanical APDL and ANSYS FLUENT to perform critical thermo-mechanical/CFD analysis and contribute to next-generation high-performance computing systems.Key ResponsibilitiesDevelop FEA models for CoWoS-based IC packages using ANSYS Mechanical APDLPerform thermo-mechanical stress/strain analysis and thermal cycling simulationsAnalyze package warpage, solder joint reliability, and interconnect stressDevelop CFD models using ANSYS FLUENT for solder reflow modelingCollaborate with design engineering teams on package developmentYou may be a good fit if you haveEducation & ExperiencePursuing a degree in Mechanical Engineering or related fieldAcademic or project experience with FEA/CFD tools and analysisTechnical SkillsProficiency in SOLIDWORKS/NX, ANSYS Mechanical APDL and ANSYS FLUENTUnderstanding of semiconductor packaging materials and processesStrong grasp on non-linear properties of materials (elastic-plastic, viscoelastic)Familiarity with CoWoS-S/L/R, TSVs, or 2.5D/3D integration conceptsBasic programming/scripting skills (APDL, Python, MATLAB)Strong Candidates May Have Some Experience WithKnowledge of solder joint reliability and failure analysisFamiliarity with JEDEC standards and reliability testingPrevious internship in semiconductor industryWe encourage you to apply even if you do not believe you meet every qualification.Program details12-week paid internshipGenerous housing support for those relocatingDaily lunch and dinner in our officeBased at our office in San Jose, CADirect mentorship from industry leaders and world-class engineersOpportunity to work on one of the most important problems of our timeFor any questions, contact internships@etched.com.How We’re DifferentEtched believes in the Bitter Lesson. We think most of the progress in the AI field has come from using more FLOPs to train and run models, and the best way to get more FLOPs is to build model-specific hardware. Larger and larger training runs encourage companies to consolidate around fewer model architectures, which creates a market for single-model ASICs.We are a fully in-person team in West San Jose, and greatly value engineering skills. We do not have boundaries between engineering and research, and we expect all of our technical staff to contribute to both as needed.