Senior Mechanical Engineer

Annapurna Labs (our organization within AWS) designs silicon and software that accelerates innovation. Customers choose us to create cloud solutions that solve challenges that were unimaginable a short time ago—even yesterday. Our custom chips, accelerators, and software stacks enable us to take on technical challenges that have never been seen before, and deliver results that help our customers change the world. As a member of the Annapurna ML/AI Mechanical Thermal Engineering team, you'll own the end-to-end thermal and mechanical architecture for ML/AI accelerator platforms — from initial concept through production deployment and ongoing fleet operations. You'll design mechanical and cooling solutions for some of the highest power-density silicon in the industry, balancing performance, reliability, cost, and operational efficiency at massive scale. This is a technically challenging role requiring you to operate in ambiguity and at a fast pace. You'll collaborate across silicon design, electrical engineering, firmware, manufacturing, supply chain, and operations teams to deliver platforms that power AWS ML/AI services at global scale. Key job responsibilitiesAs a Cloud Hardware Development Engineer (Thermal/Mechanical), you will: Platform OwnershipOwn the complete thermal and mechanical design for ML/AI accelerator platforms — from rack-level infrastructure down to chip packaging, including mechanical packaging, structural integrity, and interconnect systems Define thermal and mechanical design requirements, establish design targets, and drive cross-functional alignment that enables parallel development across hardware, firmware, and software teams Deliver production platforms through the full lifecycle: concept, design, analysis, prototyping, validation, manufacturing ramp, and fleet operations Thermal & Mechanical Design Design and optimize cooling solutions (air and liquid) for high-power-density ML/AI accelerators Develop detailed CFD models, compact RC models, and structural FEA for SoC/package thermal analysis and mechanical integrity Design rack manifolds, cold plates, and data center liquid cooling interfaces for at-scale liquid-cooled deployments Develop and validate mechanical structures including chassis and enclosures for manufacturability, reliability, and serviceability. Owning tolerance stack-up analysis, GD&T, and DFM for high-volume manufacturing methods (stamping, bending, extrusion, die-casting) Own mechanical design of integrating high-speed interconnect subsystems including cable cartridges, backplane connectors, and mating interfaces — defining alignment, gatherability, insertion force, and serviceability requirements Perform structural FEA for shock, vibration, and transportation loads to ensure mechanical integrity across the product lifecycle Fleet Operations & Reliability Participate in on-call rotations monitoring fleet thermal telemetry for emergent issues Perform root cause analysis of thermal and mechanical failures in production, implementing firmware updates, hardware modifications, or operational procedure changes Cross-Functional Leadership Drive design standardization Engage with ODMs and component suppliers to drive design optimization, cost reduction, and supply chain resilience Lead design reviews, mentor junior engineers, and contribute to the technical direction of the broader organization Influence chip packaging decisions and establish validation methodologies About the teamIn 2015, Annapurna Labs was acquired by Amazon Web Services (AWS). Since then, we have developed products that power every layer of the AWS cloud, including AWS Nitro, Graviton processors, and custom ML/AI accelerators — Trainium for training and Inferentia for inference — that enable customers to build and run generative AI applications at scale. The ML/AI MTE team is part of the Annapurna ML/AI hardware development organization. We design and deliver the thermal and mechanical systems for every generation of custom ML/AI accelerator hardware — from chip package through rack-level infrastructure. Our platforms operate at massive scale across AWS data centers globally, with current programs including next-generation Trainium and Inferentia systems featuring liquid cooling at scale.Basic qualifications- BS degree in mechanical engineering or equivalent- 7+ years industry experience in Mechanical and Thermal design in electronics packaging- Experience in thermal and performance measurements and characterization on SoCs, Servers, or related Systems- 3+ years of experience in SoC Thermal modelling and IC package transient thermal response- Experience with chip package, system mechanical & thermal design for air-cooled and liquid-cooled systems- Experience with tolerance analysis (stack-up/GD&T) and sheet metal or precision-machined component design for electronics packaging- Experience with production fleet support: telemetry analysis, root cause analysis, and defining mitigation strategies- Experience leading cross-functional technical projects spanning silicon, firmware, mechanical, and operations teamsPreferred qualification - Knowledge of generic mechanical room infrastructure such as chillers, cooler units, and fan controls- Experience in mentoring, leading, or managing more junior engineers- Knowledge of SoC thermal/mechanical design methodology, power modeling and thermal analysis techniques- Tool familiarity: Ansys Icepak, FloTherm, Cadence Celsius, PTC Creo, and Solidworks- Proficiency in 3D CAD modeling and engineering drawings per ASME Y14.5 (GD&T) standards- Programming experience: Bash script, Shell script, Linux, Python, and Lua. Familiarity with working in a Linux environment- Knowledge of various types of technologies used for heatsink solutions, Thermal Interface Materials (TIMs), and liquid cooling technologies- Knowledge of hardware and software based thermal/power management control algorithms- Experience with liquid cooling system design: rack manifolds, cold plates, quick-disconnect fittings, CDU integration- Experience with mechanical design of high-density interconnect systems (cable cartridges, blind-mate connectors, backplane assemblies)- Experience with high-power-density ML/AI accelerator or HPC thermal design- Track record of driving cost optimization through vendor strategy, second-sourcing, or design-for-manufacturing improvements- Familiarity with manufacturing processes: injection molding, sheet metal fabrication, die-casting, and CNC machining — including trade-offs between methods- Experience with shock, vibration, and structural qualification testing per ISTA, ASTM, or equivalent standardsAmazon is an equal opportunity employer and does not discriminate on the basis of protected veteran status, disability, or other legally protected status.Los Angeles County applicants: Job duties for this position include: work safely and cooperatively with other employees, supervisors, and staff; adhere to standards of excellence despite stressful conditions; communicate effectively and respectfully with employees, supervisors, and staff to ensure exceptional customer service; and follow all federal, state, and local laws and Company policies. Criminal history may have a direct, adverse, and negative relationship with some of the material job duties of this position. These include the duties and responsibilities listed above, as well as the abilities to adhere to company policies, exercise sound judgment, effectively manage stress and work safely and respectfully with others, exhibit trustworthiness and professionalism, and safeguard business operations and the Company’s reputation. Pursuant to the Los Angeles County Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records.Our inclusive culture empowers Amazonians to deliver the best results for our customers. If you have a disability and need a workplace accommodation or adjustment during the application and hiring process, including support for the interview or onboarding process, please visit for more information. If the country/region you’re applying in isn’t listed, please contact your Recruiting Partner.The base salary range for this position is listed below. Your Amazon package will include sign-on payments and restricted stock units (RSUs). Final compensation will be determined based on factors including experience, qualifications, and location. Amazon also offers comprehensive benefits including health insurance (medical, dental, vision, prescription, Basic Life & AD&D insurance and option for Supplemental life plans, EAP, Mental Health Support, Medical Advice Line, Flexible Spending Accounts, Adoption and Surrogacy Reimbursement coverage), 401(k) matching, paid time off, and parental leave. Learn more about our benefits at .USA, CA, Cupertino - 183,000.00 - 247,600.00 USD annuallyUSA, TX, Austin - 159,200.00 - 215,300.00 USD annuallyUSA, WA, Seattle - 159,200.00 - 215,300.00 USD annually